من کلاسهام به این شکله:
کلاس کانتکس‌های من
public class VegaContext : DbContext, IUnitOfWork, IDbContext
{
#region Constructors (2)
/// <summary>
/// Initializes the <see cref="VegaContext" /> class.
/// </summary>
static VegaContext()
{
Database.SetInitializer<VegaContext>(null);
}
/// <summary>
/// Initializes a new instance of the <see cref="VegaContext" /> class.
/// </summary>
public VegaContext() : base("LocalSqlServer") { }
#endregion Constructors
#region Properties (2)
/// <summary>
/// Gets or sets the languages.
/// </summary>
/// <value>
/// The languages.
/// </value>
public DbSet<Language> Languages { get; set; }
/// <summary>
/// Gets or sets the resources.
/// </summary>
/// <value>
/// The resources.
/// </value>
public DbSet<Resource> Resources { get; set; }
#endregion Properties
#region Methods (2)
// Public Methods (1)
/// <summary>
/// Setups the specified model builder.
/// </summary>
/// <param name="modelBuilder">The model builder.</param>
public void Setup(DbModelBuilder modelBuilder)
{
//todo
modelBuilder.Configurations.Add(new ResourceMap());
modelBuilder.Configurations.Add(new LanguageMap());
modelBuilder.Entity<Resource>().ToTable("Vega_Languages_Resources");
modelBuilder.Entity<Language>().ToTable("Vega_Languages_Languages");
//base.OnModelCreating(modelBuilder);
}
// Protected Methods (1)
/// <summary>
/// This method is called when the model for a derived context has been initialized, but
/// before the model has been locked down and used to initialize the context. The default
/// implementation of this method does nothing, but it can be overridden in a derived class
/// such that the model can be further configured before it is locked down.
/// </summary>
/// <param name="modelBuilder">The builder that defines the model for the context being created.</param>
/// <remarks>
/// Typically, this method is called only once when the first instance of a derived context
/// is created. The model for that context is then cached and is for all further instances of
/// the context in the app domain. This caching can be disabled by setting the ModelCaching
/// property on the given ModelBuidler, but note that this can seriously degrade performance.
/// More control over caching is provided through use of the DbModelBuilder and DbContextFactory
/// classes directly.
/// </remarks>
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new ResourceMap());
modelBuilder.Configurations.Add(new LanguageMap());
modelBuilder.Entity<Resource>().ToTable("Vega_Languages_Resources");
modelBuilder.Entity<Language>().ToTable("Vega_Languages_Languages");
base.OnModelCreating(modelBuilder);
}
#endregion Methods
#region IUnitOfWork Members
/// <summary>
/// Sets this instance.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <returns></returns>
public new IDbSet<TEntity> Set<TEntity>() where TEntity : class
{
return base.Set<TEntity>();
}
#endregion
}
در تعاریف کلاسهایی که از IDBContext ارث می‌برن اکسپورت شدن (این یک نمونه از کلاس‌های منه)
در طرف دیگر برای لود کردن کلاس زیر نوشتم
public class LoadContexts
{
public LoadContexts()
{
var directoryPath = HttpRuntime.BinDirectory;//AppDomain.CurrentDomain.BaseDirectory; //"Dll folder path";
var directoryCatalog = new DirectoryCatalog(directoryPath, "*.dll");
var aggregateCatalog = new AggregateCatalog();
aggregateCatalog.Catalogs.Add(directoryCatalog);
var container = new CompositionContainer(aggregateCatalog);
container.ComposeParts(this);
}
//[Import]
//public IPlugin Plugin { get; set; }
[ImportMany]
public IEnumerable<IDbContext> Contexts { get; set; }
}
و در کانتکس اصلی برنامه این پلاگین هارو لود می‌کنم
public class MainContext : DbContext, IUnitOfWork
{
public MainContext() : base("LocalSqlServer") { }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
var contextList = new LoadContexts(); //ObjectFactory.GetAllInstances<IDbContext>();
foreach (var context in contextList.Contexts)
context.Setup(modelBuilder);
Database.SetInitializer(new MigrateDatabaseToLatestVersion<MainContext, Configuration>());
//Database.SetInitializer(new DropCreateDatabaseAlways<MainContext>());
}
/// <summary>
/// Sets this instance.
/// </summary>
/// <typeparam name="TEntity">The type of the entity.</typeparam>
/// <returns></returns>
public IDbSet<TEntity> Set<TEntity>() where TEntity : class
{
return base.Set<TEntity>();
}
}
با موفقیت همه پلاگین‌ها لود میشه و مشکلی در عملیات نیست. اما Attributeهای کلاس هارو نمیشناسه. مثلا پیام خطا تعریف شده در MVC نمایش داده نمیشه چون وجود نداره ولی وقتی کلاس مورد نظر از IValidatableObject ارث میبره خطای‌های من نمایش داده میشه. می‌خوام از خود متادیتاهای استاندارد استفاده کنم.
