public interface IUnitOfWork { Lazy<IDbSet<TEntity>> LazySet<TEntity>() where TEntity : class; int SaveChanges(); }
Lazy <IDbSet<TEntity>> LazySet<TEntity>() where TEntity : class
public interface IUnitOfWork { Lazy<IDbSet<TEntity>> LazySet<TEntity>() where TEntity : class; int SaveChanges(); }
Lazy <IDbSet<TEntity>> LazySet<TEntity>() where TEntity : class
public class User { public int Id { get; set; } [Unique] public string Email { get; set; } [Unique("MyUniqueIndex",UniqueIndexOrder.ASC)] public string Username { get; set; } [Unique(UniqueIndexOrder.DESC)] public string PersonalCode{ get; set; } public string Password { get; set; } public string FirstName { get; set; } public string LastName { get; set; } }
using System; namespace SampleUniqueIndex { [AttributeUsage(AttributeTargets.Property, Inherited = false, AllowMultiple = false)] public class UniqueAttribute : Attribute { public UniqueAttribute(UniqueIndexOrder order = UniqueIndexOrder.ASC) { Order = order; } public UniqueAttribute(string indexName,UniqueIndexOrder order = UniqueIndexOrder.ASC) { IndexName = indexName; Order = order; } public string IndexName { get; private set; } public UniqueIndexOrder Order { get; set; } } public enum UniqueIndexOrder { ASC, DESC } }
using System; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataAnnotations.Schema; using System.Data.Entity; using System.Data.Entity.Infrastructure; using System.Data.Metadata.Edm; using System.Linq; using System.Reflection; namespace SampleUniqueIndex { public static class DbContextExtention { private static BindingFlags PublicInstance = BindingFlags.Public | BindingFlags.Instance | BindingFlags.FlattenHierarchy; public static void ExecuteUniqueIndexes(this DbContext context) { var tables = GetTables(context); var query = ""; foreach (var dbSet in GetDbSets(context)) { var entityType = dbSet.PropertyType.GetGenericArguments().First(); var table = tables[entityType.Name]; var currentIndexes = GetCurrentUniqueIndexes(context, table.TableName); foreach (var uniqueProp in GetUniqueProperties(context, entityType, table)) { var indexName = string.IsNullOrWhiteSpace(uniqueProp.IndexName) ? "IX_Unique_" + uniqueProp.TableName + "_" + uniqueProp.FieldName : uniqueProp.IndexName; if (!currentIndexes.Contains(indexName)) { query += "ALTER TABLE [" + table.TableSchema + "].[" + table.TableName + "] ADD CONSTRAINT [" + indexName + "] UNIQUE ([" + uniqueProp.FieldName + "] " + uniqueProp.Order + "); "; } else { currentIndexes.Remove(indexName); } } foreach (var index in currentIndexes) { query += "ALTER TABLE [" + table.TableSchema + "].[" + table.TableName + "] DROP CONSTRAINT " + index + "; "; } } if (query.Length > 0) context.Database.ExecuteSqlCommand(query); } private static List<string> GetCurrentUniqueIndexes(DbContext context, string tableName) { var sql = "SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS where table_name = '" + tableName + "' and CONSTRAINT_TYPE = 'UNIQUE'"; var result = context.Database.SqlQuery<string>(sql).ToList(); return result; } private static IEnumerable<PropertyDescriptor> GetDbSets(DbContext context) { foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(context)) { var notMapped = prop.GetType().GetCustomAttributes(typeof(NotMappedAttribute),true); if (prop.PropertyType.Name == typeof(DbSet<>).Name && notMapped.Length == 0) yield return prop; } } private static List<UniqueProperty> GetUniqueProperties(DbContext context, Type entity, TableInfo tableInfo) { var indexedProperties = new List<UniqueProperty>(); var properties = entity.GetProperties(PublicInstance); var tableName = tableInfo.TableName; foreach (var prop in properties) { if (!prop.PropertyType.IsValueType && prop.PropertyType != typeof(string)) continue; UniqueAttribute[] uniqueAttributes = (UniqueAttribute[])prop.GetCustomAttributes(typeof(UniqueAttribute), true); NotMappedAttribute[] notMappedAttributes = (NotMappedAttribute[])prop.GetCustomAttributes(typeof(NotMappedAttribute), true); if (uniqueAttributes.Length > 0 && notMappedAttributes.Length == 0) { var fieldName = GetFieldName(context, entity, prop.Name); if (fieldName != null) { indexedProperties.Add(new UniqueProperty { TableName = tableName, IndexName = uniqueAttributes[0].IndexName, FieldName = fieldName, Order = uniqueAttributes[0].Order.ToString() }); } } } return indexedProperties; } private static Dictionary<string, TableInfo> GetTables(DbContext context) { var tablesInfo = new Dictionary<string, TableInfo>(); var metadata = ((IObjectContextAdapter)context).ObjectContext.MetadataWorkspace; var tables = metadata.GetItemCollection(DataSpace.SSpace) .GetItems<EntityContainer>() .Single() .BaseEntitySets .OfType<EntitySet>() .Where(s => !s.MetadataProperties.Contains("Type") || s.MetadataProperties["Type"].ToString() == "Tables"); foreach (var table in tables) { var tableName = table.MetadataProperties.Contains("Table") && table.MetadataProperties["Table"].Value != null ? table.MetadataProperties["Table"].Value.ToString() : table.Name; var tableSchema = table.MetadataProperties["Schema"].Value.ToString(); tablesInfo.Add(table.Name, new TableInfo { EntityName = table.Name, TableName = tableName, TableSchema = tableSchema, }); } return tablesInfo; } public static string GetFieldName(DbContext context, Type entityModel, string propertyName) { var metadata = ((IObjectContextAdapter)context).ObjectContext.MetadataWorkspace; var osMembers = metadata.GetItem<EntityType>(entityModel.FullName, DataSpace.OSpace).Properties; var ssMebers = metadata.GetItem<EntityType>("CodeFirstDatabaseSchema." + entityModel.Name, DataSpace.SSpace).Properties; if (!osMembers.Contains(propertyName)) return null; var index = osMembers.IndexOf(osMembers[propertyName]); return ssMebers[index].Name; } internal class UniqueProperty { public string TableName { get; set; } public string FieldName { get; set; } public string IndexName { get; set; } public string Order { get; set; } } internal class TableInfo { public string EntityName { get; set; } public string TableName { get; set; } public string TableSchema { get; set; } } } }
public static void ExecuteUniqueIndexes(this DbContext context) { var tables = GetTables(context); ... }
private static Dictionary<string, TableInfo> GetTables(DbContext context) { var tablesInfo = new Dictionary<string, TableInfo>(); var metadata = ((IObjectContextAdapter)context).ObjectContext.MetadataWorkspace; var tables = metadata.GetItemCollection(DataSpace.SSpace) .GetItems<EntityContainer>() .Single() .BaseEntitySets .OfType<EntitySet>() .Where(s => !s.MetadataProperties.Contains("Type") || s.MetadataProperties["Type"].ToString() == "Tables"); foreach (var table in tables) { var tableName = table.MetadataProperties.Contains("Table") && table.MetadataProperties["Table"].Value != null ? table.MetadataProperties["Table"].Value.ToString() : table.Name; var tableSchema = table.MetadataProperties["Schema"].Value.ToString(); tablesInfo.Add(table.Name, new TableInfo { EntityName = table.Name, TableName = tableName, TableSchema = tableSchema, }); } return tablesInfo; }
public static void ExecuteUniqueIndexes(this DbContext context) { var tables = GetTables(context); var query = ""; foreach (var dbSet in GetDbSets(context)) { .... }
public static void ExecuteUniqueIndexes(this DbContext context) { ... foreach (var dbSet in GetDbSets(context)) { var entityType = dbSet.PropertyType.GetGenericArguments().First(); var table = tables[entityType.Name]; var currentIndexes = GetCurrentUniqueIndexes(context, table.TableName); } }
public static string GetFieldName(DbContext context, Type entityModel, string propertyName) { var metadata = ((IObjectContextAdapter)context).ObjectContext.MetadataWorkspace; var osMembers = metadata.GetItem<EntityType>(entityModel.FullName, DataSpace.OSpace).Properties; var ssMebers = metadata.GetItem<EntityType>("CodeFirstDatabaseSchema." + entityModel.Name, DataSpace.SSpace).Properties; if (!osMembers.Contains(propertyName)) return null; var index = osMembers.IndexOf(osMembers[propertyName]); return ssMebers[index].Name; }
protected override void Seed(myDbContext context) { // This method will be called after migrating to the latest version. // You can use the DbSet<T>.AddOrUpdate() helper extension method // to avoid creating duplicate seed data. E.g. // // context.People.AddOrUpdate( // p => p.FullName, // new Person { FullName = "Andrew Peters" }, // new Person { FullName = "Brice Lambson" }, // new Person { FullName = "Rowan Miller" } // ); // context.ExecuteUniqueIndexes(); }
routes.MapRoute( name: "ProductPage", url: "{productId}/{productTitle}", defaults: new { controller = "Products", action = "Show" }, constraints: new { productId = "\\d+" } );
[Route("{productId:int}/{productTitle}")] public ActionResult Show(int productId) { ... }
public class RouteConfig { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapMvcAttributeRoutes(); } }
public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapMvcAttributeRoutes(); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } ); }
public class BooksController : Controller { // eg: /books // eg: /books/1430210079 [Route("books/{isbn?}")] public ActionResult View(string isbn) { if (!String.IsNullOrEmpty(isbn)) { return View("OneBook", GetBook(isbn)); } return View("AllBooks", GetBooks()); } // eg: /books/lang // eg: /books/lang/en // eg: /books/lang/he [Route("books/lang/{lang=en}")] public ActionResult ViewByLanguage(string lang) { return View("OneBook", GetBooksByLanguage(lang)); } }
public class ReviewsController : Controller { // eg: /reviews [Route("reviews")] public ActionResult Index() { ... } // eg: /reviews/5 [Route("reviews/{reviewId}")] public ActionResult Show(int reviewId) { ... } // eg: /reviews/5/edit [Route("reviews/{reviewId}/edit")] public ActionResult Edit(int reviewId) { ... } }
[RoutePrefix("reviews")] public class ReviewsController : Controller { // eg.: /reviews [Route] public ActionResult Index() { ... } // eg.: /reviews/5 [Route("{reviewId}")] public ActionResult Show(int reviewId) { ... } // eg.: /reviews/5/edit [Route("{reviewId}/edit")] public ActionResult Edit(int reviewId) { ... } }
[RoutePrefix("reviews")] public class ReviewsController : Controller { // eg.: /spotlight-review [Route("~/spotlight-review")] public ActionResult ShowSpotlight() { ... } ... }
[RoutePrefix("promotions")] [Route("{action=index}")] public class ReviewsController : Controller { // eg.: /promotions public ActionResult Index() { ... } // eg.: /promotions/archive public ActionResult Archive() { ... } // eg.: /promotions/new public ActionResult New() { ... } // eg.: /promotions/edit/5 [Route("edit/{promoId:int}")] public ActionResult Edit(int promoId) { ... } }
// eg: /users/5 [Route("users/{id:int}"] public ActionResult GetUserById(int id) { ... } // eg: users/ken [Route("users/{name}"] public ActionResult GetUserByName(string name) { ... }
مثال | توضیحات | محدودیت |
{x:alpha} | کاراکترهای الفبای لاتین را تطبیق (match) میدهد (a-z, A-Z). | alpha |
{x:bool} | یک مقدار منطقی را تطبیق میدهد. | bool |
{x:datetime} | یک مقدار DateTime را تطبیق میدهد. | datetime |
{x:decimal} | یک مقدار پولی را تطبیق میدهد. | decimal |
{x:double} | یک مقدار اعشاری 64 بیتی را تطبیق میدهد. | double |
{x:float} | یک مقدار اعشاری 32 بیتی را تطبیق میدهد. | float |
{x:guid} | یک مقدار GUID را تطبیق میدهد. | guid |
{x:int} | یک مقدار 32 بیتی integer را تطبیق میدهد. | int |
{(x:length(6} {(x:length(1,20} | رشته ای با طول تعیین شده را تطبیق میدهد. | length |
{x:long} | یک مقدار 64 بیتی integer را تطبیق میدهد. | long |
{(x:max(10} | یک مقدار integer با حداکثر مجاز را تطبیق میدهد. | max |
{(x:maxlength(10} | رشته ای با حداکثر طول تعیین شده را تطبیق میدهد. | maxlength |
{(x:min(10} | مقداری integer با حداقل مقدار تعیین شده را تطبیق میدهد. | min |
{(x:minlength(10} | رشته ای با حداقل طول تعیین شده را تطبیق میدهد. | minlength |
{(x:range(10,50} | مقداری integer در بازه تعریف شده را تطبیق میدهد. | range |
{(${x:regex(^\d{3}-\d{3}-\d{4} | یک عبارت با قاعده را تطبیق میدهد. | regex |
// eg: /users/5 // but not /users/10000000000 because it is larger than int.MaxValue, // and not /users/0 because of the min(1) constraint. [Route("users/{id:int:min(1)}")] public ActionResult GetUserById(int id) { ... }
// eg: /greetings/bye // and /greetings because of the Optional modifier, // but not /greetings/see-you-tomorrow because of the maxlength(3) constraint. [Route("greetings/{message:maxlength(3)?}")] public ActionResult Greet(string message) { ... }
public class ValuesConstraint : IRouteConstraint { private readonly string[] validOptions; public ValuesConstraint(string options) { validOptions = options.Split('|'); } public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection) { object value; if (values.TryGetValue(parameterName, out value) && value != null) { return validOptions.Contains(value.ToString(), StringComparer.OrdinalIgnoreCase); } return false; } }
public class RouteConfig { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); var constraintsResolver = new DefaultInlineConstraintResolver(); constraintsResolver.ConstraintMap.Add("values", typeof(ValuesConstraint)); routes.MapMvcAttributeRoutes(constraintsResolver); } }
public class TemperatureController : Controller { // eg: temp/celsius and /temp/fahrenheit but not /temp/kelvin [Route("temp/{scale:values(celsius|fahrenheit)}")] public ActionResult Show(string scale) { return Content("scale is " + scale); } }
[Route("menu", Name = "mainmenu")] public ActionResult MainMenu() { ... }
<a href="@Url.RouteUrl("mainmenu")">Main menu</a>
[RouteArea("Admin")] [RoutePrefix("menu")] [Route("{action}")] public class MenuController : Controller { // eg: /admin/menu/login public ActionResult Login() { ... } // eg: /admin/menu/show-options [Route("show-options")] public ActionResult Options() { ... } // eg: /stats [Route("~/stats")] public ActionResult Stats() { ... } }
Url.Action("Options", "Menu", new { Area = "Admin" })
[RouteArea("BackOffice", AreaPrefix = "back-office")]
public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapMvcAttributeRoutes(); AreaRegistration.RegisterAllAreas(); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } ); }
current=1&rowCount=10&sort[sender]=asc&searchPhrase=&id=b0df282a-0d67-40e5-8558-c9e93b7befed
[AttributeUsage(AttributeTargets.Property,Inherited = true)] public class RequestBodyField:Attribute { public string Field; public RequestBodyField(string field) { this.Field = field; } }
public class EmployeesRequestBody { [RequestBodyField("current")] public int CurrentPage { get; set; } [RequestBodyField("rowcount")] public int RowCount { get; set; } [RequestBodyField("searchPhrase")] public string SearchPhrase { get; set; } [RequestBodyField("sort")] public NameValueCollection SortDictionary { get; set; } }
public T GetFromQueryString<T>() where T : new() { var obj = new T(); var queryString = HttpContext.Current.Request.QueryString; var queries = HttpUtility.ParseQueryString(queryString.ToString()); var properties = typeof(T).GetProperties(); foreach (var property in properties) { foreach (Attribute attribute in property.GetCustomAttributes(true)) { var requestBodyField = attribute as RequestBodyField; if (requestBodyField == null) continue; //get value of query string var valueAsString = queries[requestBodyField.Field]; var converter = TypeDescriptor.GetConverter(property.PropertyType); var value = converter.ConvertFrom(valueAsString); if (value == null) continue; property.SetValue(obj, value, null); } } return obj; }
HttpContext.Current.Request.QueryString
var converter = TypeDescriptor.GetConverter(property.PropertyType); var value = converter.ConvertFrom(valueAsString);
if (valueAsString == null) { var keys = from key in queries.AllKeys where key.StartsWith(requestBodyField.Field) select key; var collection = new NameValueCollection(); foreach (var key in keys) { var openBraketIndex = key.IndexOf("[", StringComparison.Ordinal); var closeBraketIndex = key.IndexOf("]", StringComparison.Ordinal); if (openBraketIndex < 0 || closeBraketIndex < 0) throw new Exception("query string is corrupted."); openBraketIndex++; //get key in [...] var fieldName = key.Substring(openBraketIndex, closeBraketIndex - openBraketIndex); collection.Add(fieldName, queries[key] ); } property.SetValue(obj, collection, null); continue; }
public T GetFromQueryString<T>() where T : new() { var obj = new T(); var properties = typeof(T).GetProperties(); var queryString = HttpContext.Current.Request.QueryString; var queries = HttpUtility.ParseQueryString(queryString.ToString()); foreach (var property in properties) { foreach (Attribute attribute in property.GetCustomAttributes(true)) { var requestBodyField = attribute as RequestBodyField; if (requestBodyField == null) continue; //get value of query string var valueAsString = queries[requestBodyField.Field]; if (valueAsString == null) { var keys = from key in queries.AllKeys where key.StartsWith(requestBodyField.Field) select key; var collection = new NameValueCollection(); foreach (var key in keys) { var openBraketIndex = key.IndexOf("[", StringComparison.Ordinal); var closeBraketIndex = key.IndexOf("]", StringComparison.Ordinal); if (openBraketIndex < 0 || closeBraketIndex < 0) throw new Exception("query string is corrupted."); openBraketIndex++; //get key in [...] var fieldName = key.Substring(openBraketIndex, closeBraketIndex - openBraketIndex); collection.Add(fieldName, queries[key]); } property.SetValue(obj, collection, null); continue; } var converter = TypeDescriptor.GetConverter(property.PropertyType); var value = converter.ConvertFrom(valueAsString); if (value == null) continue; property.SetValue(obj, value, null); } } return obj; }
public virtual ActionResult GetEmployees() { var request = new Requests().GetFromQueryString<EmployeesRequestBody>(); }
PM> Install-Package snap.structuremap
StructureMap (≥ 2.6.4.1) CommonServiceLocator.StructureMapAdapter (≥ 1.1.0.3) SNAP (≥ 1.8) fasterflect (≥ 2.1.2) Castle.Core (≥ 3.1.0) CommonServiceLocator (≥ 1.0)
تنظیمات SNAP
namespace Framework.UI.Asp { public class Global : HttpApplication { void Application_Start(object sender, EventArgs e) { initSnap(); initStructureMap(); } private static void initSnap() { SnapConfiguration.For<StructureMapAspectContainer>(c => { // Tell Snap to intercept types under the "Framework.ServiceLayer..." namespace. c.IncludeNamespace("Framework.ServiceLayer.*"); // Register a custom interceptor (a.k.a. an aspect). c.Bind<Framework.ServiceLayer.Aspects.AuthorizationInterceptor>() .To<Framework.ServiceLayer.Aspects.AuthorizationAttribute>(); }); } void Application_EndRequest(object sender, EventArgs e) { ObjectFactory.ReleaseAndDisposeAllHttpScopedObjects(); } private static void initStructureMap() { var thread = StructureMap.Pipeline.Lifecycles.GetLifecycle(InstanceScope.HttpSession); ObjectFactory.Configure(x => { x.For<IUserManager>().Use<EFUserManager>(); x.For<IAuthorizationManager>().LifecycleIs(thread) .Use<EFAuthorizationManager>().Named("_AuthorizationManager"); x.For<Framework.DataLayer.IUnitOfWork>() .Use<Framework.DataLayer.Context>(); x.SetAllProperties(y => { y.OfType<IUserManager>(); y.OfType<Framework.DataLayer.IUnitOfWork>(); y.OfType<Framework.Common.Web.IPageHelpers>(); }); }); } } }
namespace Framework.ServiceLayer.Aspects { public class AuthorizationInterceptor : MethodInterceptor { public override void InterceptMethod(IInvocation invocation, MethodBase method, Attribute attribute) { var AuthManager = StructureMap.ObjectFactory .GetInstance<Framework.ServiceLayer.UserManager.IAuthorizationManager>(); var FullName = GetMethodFullName(method); if (!AuthManager.IsActionAuthorized(FullName)) throw new Common.Exceptions.UnauthorizedAccessException(""); invocation.Proceed(); // the underlying method call } private static string GetMethodFullName(MethodBase method) { var TypeName = (((System.Reflection.MemberInfo)(method)).DeclaringType).FullName; return TypeName + "." + method.Name; } } public class AuthorizationAttribute : MethodInterceptAttribute { }
namespace Snap { public abstract class MethodInterceptor : IAttributeInterceptor, IInterceptor, IHideBaseTypes { protected MethodInterceptor(); public int Order { get; set; } public Type TargetAttribute { get; set; } public virtual void AfterInvocation(); public virtual void BeforeInvocation(); public void Intercept(IInvocation invocation); public abstract void InterceptMethod(IInvocation invocation, MethodBase method, Attribute attribute); public bool ShouldIntercept(IInvocation invocation); } }
یک نکته
private void Application_PreRequestHandlerExecute(object source, EventArgs e) { var page = HttpContext.Current.Handler as BasePage; // The Page handler if (page == null) return; WireUpThePage(page); WireUpAllUserControls(page); var UsrCod = HttpContext.Current.Session["UsrCod"]; if (UsrCod != null) { var _AuthorizationManager = ObjectFactory .GetNamedInstance<Framework.ServiceLayer.UserManager.IAuthorizationManager>("_AuthorizationManager"); ((Framework.ServiceLayer.UserManager.EFAuthorizationManager)_AuthorizationManager) .AuditUserId = UsrCod.ToString(); } }
namespace Framework.ServiceLayer.UserManager { public class EFUserManager : IUserManager { IUnitOfWork _uow; IDbSet<User> _users; public EFUserManager(IUnitOfWork uow) { _uow = uow; _users = _uow.Set<User>(); } [Framework.ServiceLayer.Aspects.Authorization] public List<User> GetAll() { return _users.ToList<User>(); } } }
public class AccountType : ObjectGraphType<Account> { public AccountType() { Field(x => x.Id, type: typeof(IdGraphType)).Description("Id property from the account object."); Field(x => x.Description).Description("Description property from the account object."); Field(x => x.OwnerId, type: typeof(IdGraphType)).Description("OwnerId property from the account object."); } }
public interface IAccountRepository { IEnumerable<Account> GetAllAccountsPerOwner(Guid ownerId); } public class AccountRepository : IAccountRepository { private readonly ApplicationContext _context; public AccountRepository(ApplicationContext context) { _context = context; } public IEnumerable<Account> GetAllAccountsPerOwner(Guid ownerId) => _context.Accounts .Where(a => a.OwnerId.Equals(ownerId)) .ToList(); }
public class OwnerType : ObjectGraphType<Owner> { public OwnerType(IAccountRepository repository) { Field(x => x.Id, type: typeof(IdGraphType)).Description("Id property from the owner object."); Field(x => x.Name).Description("Name property from the owner object."); Field(x => x.Address).Description("Address property from the owner object."); Field<ListGraphType<AccountType>>( "accounts", resolve: context => repository.GetAllAccountsPerOwner(context.Source.Id) ); } }
https://localhost:5001/ui/playground
{ owners{ id, name, address, accounts{ id, description, ownerId } } }
public class AccountTypeEnumType : EnumerationGraphType<TypeOfAccount> { public AccountTypeEnumType() { Name = "Type"; Description = "Enumeration for the account type object."; } }
public class AccountType : ObjectGraphType<Account> { public AccountType() { ... Field<AccountTypeEnumType>("Type", "Enumeration for the account type object."); } }
{ owners{ id, name, address, accounts{ id, description, type, ownerId } } }
public interface IAccountRepository { ... Task<ILookup<Guid, Account>> GetAccountsByOwnerIds(IEnumerable<Guid> ownerIds); }
public class AccountRepository : IAccountRepository { ... public async Task<ILookup<Guid, Account>> GetAccountsByOwnerIds(IEnumerable<Guid> ownerIds) { var accounts = await _context.Accounts.Where(a => ownerIds.Contains(a.OwnerId)).ToListAsync(); return accounts.ToLookup(x => x.OwnerId); } }
public class OwnerType : ObjectGraphType<Owner> { public OwnerType(IAccountRepository repository, IDataLoaderContextAccessor dataLoader) { ... Field<ListGraphType<AccountType>>( "accounts", resolve: context => { var loader = dataLoader.Context.GetOrAddCollectionBatchLoader<Guid, Account>("GetAccountsByOwnerIds", repository.GetAccountsByOwnerIds); return loader.LoadAsync(context.Source.Id); }); } }
services.AddGraphQL(o => { o.ExposeExceptions = false; }) .AddGraphTypes(ServiceLifetime.Scoped) .AddDataLoader();
public interface IOwnerRepository { ... Owner GetById(Guid id); } public class OwnerRepository : IOwnerRepository { ... Owner GetById(Guid id) => _context.Owners.SingleOrDefault(o => o.Id.Equals(id)); }
public class AppQuery : ObjectGraphType { public AppQuery(IOwnerRepository repository) { ... Field<OwnerType>( "owner", arguments: new QueryArguments(new QueryArgument<NonNullGraphType<IdGraphType>> { Name = "ownerId" }), resolve: context => { var id = context.GetArgument<Guid>("ownerId"); return repository.GetById(id); } ); } }
Field<OwnerType>( "owner", arguments: new QueryArguments(new QueryArgument<NonNullGraphType<IdGraphType>> { Name = "ownerId" }), resolve: context => { Guid id; if (!Guid.TryParse(context.GetArgument<string>("ownerId"), out id)) { context.Errors.Add(new ExecutionError("Wrong value for guid")); return null; } return repository.GetById(id); } );
{ owner(ownerId:"6f513773-be46-4001-8adc-2e7f17d52d83"){ id, name, address, accounts{ id, description, type, ownerId } }
string name = context.GetArgument<string>("name");
{ owner(ownerId:"53270061-3ba1-4aa6-b937-1f6bc57d04d2", name:"ANDY") { ... } }
{ first:owners{ ownerId:id, ownerName:name, ownerAddress:address, ownerAccounts:accounts { accountId:id, accountDescription:description, accountType:type } }, second:owners{ ownerId:id, ownerName:name, ownerAddress:address, ownerAccounts:accounts { accountId:id, accountDescription:description, accountType:type } } }
fragment SampleName on Type{ ... }
{ first:owners{ ...ownerFields }, second:owners{ ...ownerFields }, ... } fragment ownerFields on OwnerType{ ownerId:id, ownerName:name, ownerAddress:address, ownerAccounts:accounts { accountId:id, accountDescription:description, accountType:type } }
query OwnerQuery($ownerId:ID!) { owner(ownerId:$ownerId){ id, name, address, accounts{ id, description, type } } }
{ "ownerId":"6f513773-be46-4001-8adc-2e7f17d52d83" }
public class BoolToVisibilityConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { // Do the conversion from bool to visibility } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { // Do the conversion from visibility to bool } }
<Window x:Class="test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:نامی دلخواه="clr-namespace:فضای نامی که کلاس مبدل در آن قرار دارد" > <Window.Resources> <نام دلخواهی که در بالا تعریف کرده اید: ClassNameنام کلاس x:Key="کلید این آیتم در ریسورس"/> </Window.Resources>
{Binding نام پراپرتی کلاس, Converter={StaticResource کلید آیتم مربوطه در ریسورس}, ConverterParameter=پارامتری که به کلاس مبدل پاس میشود}
using System; using System.Globalization; using System.Windows; using System.Windows.Data; namespace test.ValueConverters { public class GenderConverter: IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var ParameterString = parameter as string; if (ParameterString == null) return DependencyProperty.UnsetValue; bool bparam; bool test = bool.TryParse(parameter.ToString(), out bparam); if (test) { return ((bool)value).Equals(bparam); } return DependencyProperty.UnsetValue; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } }
<Window x:Class="test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:valueConverters="clr-namespace:test.ValueConverters" Title="MainWindow" Height="511.851" Width="525"> <Window.Resources> <valueConverters:GenderConverter x:Key="GenderConverter"/> </Window.Resources> </window>
نکته: در صورتی که بعد از تعریف ریسورس با خطای زیر روبرو شدید و محیط طراحی Design را از دست دادید یکبار پروژه را بیلد کنید تا مشکل حل شود.
The name "GenderConverter" does not exist in the namespace "clr-namespace:test.ValueConverters".
<RadioButton GroupName="Gender" IsChecked="{Binding Gender, Converter={StaticResource GenderConverter}, ConverterParameter=True}" Name="RdoMale" >Male</RadioButton> <RadioButton GroupName="Gender" IsChecked="{Binding Gender, Converter={StaticResource GenderConverter}, ConverterParameter=False}" Name="RdoFemale" Margin="0 5 0 0" >Female</RadioButton>
<RadioButton GroupName="Gender" IsChecked="{Binding Gender}" Name="RdoMale" >Male</RadioButton>
public enum FieldOfWork { Actor=0, Director=1, Producer=2 } public class Person : INotifyPropertyChanged { public bool Gender { get; set; } public string ImageName { get; set; } public string Country { get; set; } public DateTime Date { get; set; } public FieldOfWork FieldOfWork { get; set; } private string _name; public string Name { get { return _name; } set { _name = value; OnPropertyChanged(); } }
public FieldOfWork FieldOfWork { get; set; }
using System; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Data; namespace test.ValueConverters { public class EnumConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var ParameterString = parameter as string; if (ParameterString == null) return DependencyProperty.UnsetValue; if (Enum.IsDefined(value.GetType(), value) == false) return DependencyProperty.UnsetValue; object paramvalue = Enum.Parse(value.GetType(), ParameterString); return paramvalue.Equals(value); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } }
<Window.Resources> <valueConverters:GenderConverter x:Key="GenderConverter"/> <valueConverters:EnumConverter x:Key="EnumConverter"></valueConverters:EnumConverter> </Window.Resources>
<CheckBox Name="ChkActor" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumConverter}, ConverterParameter=Actor}" >Actor/Actress</CheckBox> <CheckBox Name="ChkDirector" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumConverter}, ConverterParameter=Director}" >Director</CheckBox> <CheckBox Name="ChkProducer" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumConverter}, ConverterParameter=Producer}" >Producer</CheckBox>
public static Person GetPerson() { return new Person() { Name = "Leo", Gender =true, ImageName ="man.jpg", Country = "Italy", FieldOfWork = test.FieldOfWork.Actor, Date = DateTime.Now.AddDays(-3) }; }
public enum FieldOfWork { Actor=0, Director=1, Producer=2 } public class Person : INotifyPropertyChanged { public bool Gender { get; set; } public string ImageName { get; set; } public string Country { get; set; } public DateTime Date { get; set; } public IList<FieldOfWork> FieldOfWork { get; set; } private string _name; public string Name { get { return _name; } set { _name = value; OnPropertyChanged(); } } public static Person GetPerson() { return new Person { Name = "Leo", Gender = true, ImageName = "man.jpg", Country = "Italy", FieldOfWork = new FieldOfWork[] { test.FieldOfWork.Actor, test.FieldOfWork.Producer }, Date = DateTime.Now.AddDays(-3) }; } }
using System; using System.Collections; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Data; namespace test.ValueConverters { public class EnumList : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var ParameterString = parameter as string; if (ParameterString == null) return DependencyProperty.UnsetValue; var enumlist= (IList) value; if(enumlist==null && enumlist.Count<1) return DependencyProperty.UnsetValue; if (Enum.IsDefined(enumlist[0].GetType(), ParameterString) == false) return DependencyProperty.UnsetValue; /* foreach (var item in enumlist) { object paramvalue = Enum.Parse(item.GetType(), ParameterString); bool result = item.Equals(paramvalue); if (result) return true; } return false; */ return (from object item in enumlist let paramvalue = Enum.Parse(item.GetType(), ParameterString) select item.Equals(paramvalue)).Any(result => result); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } }
<Window.Resources> <valueConverters:GenderConverter x:Key="GenderConverter"/> <valueConverters:EnumConverter x:Key="EnumConverter"></valueConverters:EnumConverter> <valueConverters:EnumList x:Key="EnumList"></valueConverters:EnumList> </Window.Resources>
<CheckBox Name="ChkActor" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumList}, ConverterParameter=Actor}" >Actor/Actress</CheckBox> <CheckBox Name="ChkDirector" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumList}, ConverterParameter=Director}" >Director</CheckBox> <CheckBox Name="ChkProducer" IsChecked="{Binding FieldOfWork, Converter={StaticResource EnumList}, ConverterParameter=Producer}" >Producer</CheckBox>
بدیهی است خروجیهای بالا برای کنترل هایی است که مقدار Boolean را میپذیرند و برای سایر کنترلها باید با کمی تغییر در کد و نوع برگشتی که تحویل خروجی متد مبدل میشود، دهید.دانلود فایلهای این قسمت
using System;
namespace MvcApplication7.Models
{
public class User
{
public int Id { set; get; }
public string Name { set; get; }
public string Password { set; get; }
public DateTime AddDate { set; get; }
public bool IsAdmin { set; get; }
}
}
using System;
using System.Collections.Generic;
namespace MvcApplication7.Models
{
public class Users
{
public IList<User> CreateInMemoryDataSource()
{
return new[]
{
new User { Id = 1, Name = "User1", Password = "123", IsAdmin = false, AddDate = DateTime.Now },
new User { Id = 2, Name = "User2", Password = "456", IsAdmin = false, AddDate = DateTime.Now },
new User { Id = 3, Name = "User3", Password = "789", IsAdmin = true, AddDate = DateTime.Now }
};
}
}
}
using System;
using System.Linq;
using System.Web.Mvc;
using MvcApplication7.Models;
namespace MvcApplication7.Controllers
{
public class UserController : Controller
{
[HttpGet]
public ActionResult Index()
{
var usersList = new Users().CreateInMemoryDataSource();
return View(usersList); // Shows the Index view.
}
[HttpGet]
public ActionResult Details(int id)
{
var user = new Users().CreateInMemoryDataSource().FirstOrDefault(x => x.Id == id);
if (user == null)
return View("Error");
return View(user); // Shows the Details view.
}
[HttpGet]
public ActionResult Create()
{
var user = new User { AddDate = DateTime.Now };
return View(user); // Shows the Create view.
}
[HttpPost]
public ActionResult Create(User user)
{
if (this.ModelState.IsValid)
{
// todo: Add record
return RedirectToAction("Index");
}
return View(user); // Shows the Create view again.
}
[HttpGet]
public ActionResult Edit(int id)
{
var user = new Users().CreateInMemoryDataSource().FirstOrDefault(x => x.Id == id);
if (user == null)
return View("Error");
return View(user); // Shows the Edit view.
}
[HttpPost]
public ActionResult Edit(User user)
{
if (this.ModelState.IsValid)
{
// todo: Edit record
return RedirectToAction("Index");
}
return View(user); // Shows the Edit view again.
}
[HttpPost]
public ActionResult Delete(int id)
{
// todo: Delete record
return RedirectToAction("Index");
}
}
}
@Html.ActionLink("Delete", "Delete", new { id=item.Id }
@using (Html.BeginForm(actionName: "Delete", controllerName: "User", routeValues: new { id = item.Id }))
{
<input type="submit" value="Delete"
onclick="return confirm ('Do you want to delete this record?');" />
}
@Html.ValidationSummary(true)
ModelState.AddModelError(string.Empty, "There is something wrong with model.");
@Html.EditorFor(model => model.AddDate)
@Html.ValidationMessageFor(model => model.AddDate)
public ActionResult Edit([Bind(Include = "Name, Password")] User user)
[HttpPost]
public ActionResult Edit()
{
var user = new User();
if(TryUpdateModel(user, includeProperties: new[] { "Name", "Password" }))
{
// todo: Edit record
return RedirectToAction("Index");
}
return View(user); // Shows the Edit view again.
}
public ActionResult Edit([Bind(Exclude = "IsAdmin")] User user)
using System;
using System.Web.Mvc;
namespace MvcApplication7.Models
{
[Bind(Exclude = "IsAdmin")]
public class User
{
public int Id { set; get; }
public string Name { set; get; }
public string Password { set; get; }
public DateTime AddDate { set; get; }
public bool IsAdmin { set; get; }
}
}
using System;
using System.ComponentModel;
namespace MvcApplication7.Models
{
public class User
{
public int Id { set; get; }
public string Name { set; get; }
public string Password { set; get; }
public DateTime AddDate { set; get; }
[ReadOnly(true)]
public bool IsAdmin { set; get; }
}
}
public class MyViewModel
{
public SomeDomainModel1 Model1 { get; set; }
public SomeDomainModel2 Model2 { get; set; }
...
}
public class MyViewModel
{
public string SomeExtraField1 { get; set; }
public string SomeExtraField2 { get; set; }
public IEnumerable<SelectListItem> StateSelectList { get; set; }
// ...
public string PersonFullName { set; set; }
}
namespace MvcApplication7.Models
{
public class UserViewModel
{
public int Id { set; get; }
public string Password { set; get; }
}
}
[HttpGet]
public ActionResult Upload()
{
return View(); // Shows the upload page
}
[HttpPost]
public ActionResult Upload(System.Web.HttpPostedFileBase file)
{
string filename = Server.MapPath("~/files/somename.ext");
file.SaveAs(filename);
return RedirectToAction("Index");
}
@{
ViewBag.Title = "Upload";
}
<h2>
Upload</h2>
@using (Html.BeginForm(actionName: "Upload", controllerName: "User",
method: FormMethod.Post,
htmlAttributes: new { enctype = "multipart/form-data" }))
{
<text>Upload a photo:</text> <input type="file" name="photo" />
<input type="submit" value="Upload" />
}
using System;
using System.Globalization;
using System.Web.Mvc;
namespace MvcApplication7.Binders
{
public class PersianDateModelBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
var valueResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
var modelState = new ModelState { Value = valueResult };
object actualValue = null;
try
{
var parts = valueResult.AttemptedValue.Split('/'); //ex. 1391/1/19
if (parts.Length != 3) return null;
int year = int.Parse(parts[0]);
int month = int.Parse(parts[1]);
int day = int.Parse(parts[2]);
actualValue = new DateTime(year, month, day, new PersianCalendar());
}
catch (FormatException e)
{
modelState.Errors.Add(e);
}
bindingContext.ModelState.Add(bindingContext.ModelName, modelState);
return actualValue;
}
}
}
ModelBinders.Binders.Add(typeof(DateTime), new PersianDateModelBinder());
public ActionResult Create([ModelBinder(typeof(PersianDateModelBinder))] User user)
[ModelBinder(typeof(PersianDateModelBinder))]
public class User
{
عناوین :
· تعریف Factory Method
· دیاگرام UML
· شرکت کنندگان در UML
· مثالی از Factory Pattern در #C
تعریف الگوی Factory Method :
این الگو پیچیدگی ایجاد اشیاء برای استفاده کننده را پنهان میکند. ما با این الگو میتوانیم بدون اینکه کلاس دقیق یک شیئ را مشخص کنیم آن را ایجاد و از آن استفاده کنیم. کلاینت ( استفاده کننده ) معمولا شیئ واقعی را ایجاد نمیکند بلکه با یک واسط و یا کلاس انتزاعی (Abstract) در ارتباط است و کل مسئولیت ایجاد کلاس واقعی را به Factory Method میسپارد. کلاس Factory Method میتواند استاتیک باشد . کلاینت معمولا اطلاعاتی را به متدی استاتیک از این کلاس میفرستد و این متد بر اساس آن اطلاعات تصمیم میگیرید که کدام یک از پیاده سازیها را برای کلاینت برگرداند.
از مزایای این الگو این است که اگر در نحوه ایجاد اشیاء تغییری رخ دهد هیچ نیازی به تغییر در کد کلاینتها نخواهد بود. در این الگو اصل DIP از اصول پنجگانه SOLID به خوبی رعایت میشود چون که مسئولیت ایجاد زیرکلاسها از دوش کلاینت برداشته میشود.
دیاگرام UML :
در شکل زیر دیاگرام UML الگوی Factory Method را مشاهده میکنید.
شرکت کنندگان در این الگو به شرح زیل هستند :
- Iproduct یک واسط است که هر کلاینت از آن استفاده میکند. در اینجا کلاینت استفاده کننده نهایی است مثلا میتواند متد main یا هر متدی در کلاسی خارج از این الگو باشد. ما میتوانیم پیاده سازیهای مختلفی بر حسب نیاز از واسط Iproduct ایجاد کنیم.
- ConcreteProduct یک پیاده سازی از واسط Iproduct است ، برای این کار بایستی کلاس پیاده سازی (ConcreteProduct) از این واسط (IProduct) مشتق شود.
- Icreator واسطیست که Factory Method را تعریف میکند. پیاده ساز این واسط بر اساس اطلاعاتی دریافتی کلاس صحیح را ایجاد میکند. این اطلاعات از طریق پارامتر برایش ارسال میشوند.همانطور که گفتیم این عملیات بر عهده پیاده ساز این واسط است و ما در این نمودار این وظیفه را فقط بر عهده ConcreteCreator گذاشته ایم که از واسط Icreator مشتق شده است.
پیاده سازی UMLفوق به صورت زیر است:
در ابتدا کلاس واسط IProduct تعریف شده است.
interface IProduct { // در اینجا برحسب نیاز فیلدها و یا امضای متدها قرار میگیرند }
در این مرحله ما پند پیاده سازی از IProduct انجام میدهیم.
class ConcreteProductA : IProduct { // A پیاده سازی } class ConcreteProductB : IProduct { // B پیاده سازی }
abstract class Creator { // این متد بر اساس نوع ورودی انتخاب مناسب را انجام و باز میگرداند public abstract IProduct FactoryMethod(string type); }
class ConcreteCreator : Creator { public override IProduct FactoryMethod(string type) { switch (type) { case "A": return new ConcreteProductA(); case "B": return new ConcreteProductB(); default: throw new ArgumentException("Invalid type", "type"); } } }
برای روشنتر شدن موضوع ، یک مثال کاملتر ارائه داده میشود. در شکل زیر طراحی این برنامه نشان داده شده است.
کد برنامه به شرح زیل است :
خروجی اجرای برنامه فوق به شکل زیر است :using System; namespace FactoryMethodPatternRealWordConsolApp { internal class Program { private static void Main(string[] args) { VehicleFactory factory = new ConcreteVehicleFactory(); IFactory scooter = factory.GetVehicle("Scooter"); scooter.Drive(10); IFactory bike = factory.GetVehicle("Bike"); bike.Drive(20); Console.ReadKey(); } } public interface IFactory { void Drive(int miles); } public class Scooter : IFactory { public void Drive(int miles) { Console.WriteLine("Drive the Scooter : " + miles.ToString() + "km"); } } public class Bike : IFactory { public void Drive(int miles) { Console.WriteLine("Drive the Bike : " + miles.ToString() + "km"); } } public abstract class VehicleFactory { public abstract IFactory GetVehicle(string Vehicle); } public class ConcreteVehicleFactory : VehicleFactory { public override IFactory GetVehicle(string Vehicle) { switch (Vehicle) { case "Scooter": return new Scooter(); case "Bike": return new Bike(); default: throw new ApplicationException(string.Format("Vehicle '{0}' cannot be created", Vehicle)); } } } }
فایل این برنامه ضمیمه شده است، از لینک مقابل دانلود کنید FactoryMethodPatternRealWordConsolApp.zip
در مقالات بعدی مثالهای کاربردیتر و جامعتری از این الگو و الگوهای مرتبط ارائه خواهم کرد...