var blogs = context.Blogs
    .FromSql("SELECT * FROM dbo.Blogs")
    .ToList();

var blogs = context.Blogs
  .FromSql("EXECUTE dbo.GetMostPopularBlogs")
  .ToList();

var user = "johndoe";

var blogs = context.Blogs
  .FromSql("EXECUTE dbo.GetMostPopularBlogsForUser {0}", user)
  .ToList();

var user = new SqlParameter("user", "johndoe");
var blogs = context.Blogs
  .FromSql("EXECUTE dbo.GetMostPopularBlogsForUser @user", user)
  .ToList();

 var results = _context.Contacts.FromSql(
@"SELECT Id, Name Address, City, State, Zip 
    FROM Contacts 
    WHERE Name IN (@p0, @p1)", name1, name2);

var nameParameter = new SqlParameter
{
  ParameterName = "@name",
  Value = "doc",
  Direction = ParameterDirection.Input,
  SqlDbType = SqlDbType.NVarChar
};

var posts = context.Posts
  .FromSql("SELECT * FROM dbo.GetMatchingPostByTitle({0})", searchTerm)
  .Where(p => p.BlogId == 1)
  .OrderByDescending(p => p.CreateDate)
  .ToList();

var searchTerm = ".NET";
var blogs = context.Blogs
  .FromSql("SELECT * FROM dbo.SearchBlogs {0}", searchTerm)
  .Include(b => b.Posts)
  .ToList();

  context.Database.ExecuteSqlCommand("UPDATE dbo.People SET FirstName = 'Jane' WHERE PersonId = 30");

context.Database.ExecuteSqlCommand("usp_CreateShipper @p0, @p1",
  parameters: new[] { "hello", "world" });

using (var connection = context.Database.GetDbConnection())
{
    connection.Open();
 
    using (var command = connection.CreateCommand())
    {
        command.CommandText = "SELECT COUNT(*) FROM Contacts";
        var result = command.ExecuteScalar().ToString();
    }
}

var count = context.Facilities.Count();

var count = context.Facilities.Count(x => x.GuestCost >= 10);

var members = context.Members
                        .Where(member => member.RecommendedBy != null)
                        .GroupBy(member => member.RecommendedBy)
                        .Select(group => new
                        {
                            RecommendedBy = group.Key,
                            Count = group.Count()
                        })
                        .OrderBy(result => result.RecommendedBy)
                        .ToList();

var facilities = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.FacId)
                                    .ToList();

var date1 = new DateTime(2012, 09, 01);
var date2 = new DateTime(2012, 10, 01);

var facilities = context.Bookings
                                    .Where(booking => booking.StartTime >= date1
                                                        && booking.StartTime < date2)
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.TotalSlots)
                                    .ToList();

var date1 = new DateTime(2012, 01, 01);
var date2 = new DateTime(2013, 01, 01);

var facilities = context.Bookings
                                    .Where(booking => booking.StartTime >= date1
                                                        && booking.StartTime < date2)
                                    .GroupBy(booking => new { booking.FacId, booking.StartTime.Month })
                                    .Select(group => new
                                    {
                                        group.Key.FacId,
                                        group.Key.Month,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.FacId)
                                        .ThenBy(result => result.Month)
                                    .ToList();

var count = context.Bookings.Select(booking => booking.MemId).Distinct().Count();

var facilities = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .Where(result => result.TotalSlots > 1000)
                                    .OrderBy(result => result.FacId)
                                    .ToList();

 var facilities =
                            context.Bookings.Select(booking =>
                                new
                                {
                                    booking.Facility.Name,
                                    Revenue = booking.MemId == 0 ?
                                            booking.Slots * booking.Facility.GuestCost
                                            : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => b.Name)
                                .Select(group => new
                                {
                                    Name = group.Key,
                                    TotalRevenue = group.Sum(b => b.Revenue)
                                })
                                .OrderBy(result => result.TotalRevenue)
                                .ToList();

var facilities =
                            context.Bookings.Select(booking =>
                                new
                                {
                                    booking.Facility.Name,
                                    Revenue = booking.MemId == 0 ?
                                            booking.Slots * booking.Facility.GuestCost
                                            : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => b.Name)
                                .Select(group => new
                                {
                                    Name = group.Key,
                                    TotalRevenue = group.Sum(b => b.Revenue)
                                })
                                .Where(result => result.TotalRevenue < 1000)
                                .OrderBy(result => result.TotalRevenue)
                                .ToList();

var item = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderByDescending(result => result.TotalSlots)
                                    .FirstOrDefault();

using System;
using System.Linq;
using Raven.Client.Document;
using RavenDBSample01.Models;

namespace RavenDBSample01
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var store = new DocumentStore
            {
                Url = "http://localhost:8080"
            }.Initialize())
            {
                using (var session = store.OpenSession())
                {
                    var questions = session.Query<Question>().Where(x => x.Title.StartsWith("Raven"));
                    foreach (var question in questions)
                    {
                        Console.WriteLine(question.Title);
                    }
                }
            }
        }
    }
}

Available commands: cls, reset, gc, q
Request #   1: GET     -   179 ms - <system>   - 404 - /docs/Raven/Replication/Destinations
Request #   2: GET     - 3,818 ms - <system>   - 200 - /indexes/dynamic/Questions?&query=Title%3ARaven*&pageSize=128
        Query: Title:Raven*
        Time: 3,494 ms
        Index: Auto/Questions/ByTitle
        Results: 2 returned out of 2 total.

var questions = session.Query<Question>().Where(x => x.Title.StartsWith("Raven")).Take(128);

var questions = session.Advanced.LuceneQuery<Question>().Where("Title:Raven*").ToList();

var questions = session.Advanced.LuceneQuery<Question>().WhereStartsWith(x => x.Title, "Raven").ToList();

var query = session.Query<User>().Where(x => x.Name.StartsWith("A"));
var ageQuery = query.Where(x => x.Age > 21);
var eyeQuery = query.Where(x => x.EyeColor == "blue");

query - Name:A*
ageQuery - (Name:A*) AND (Age_Range:{Ix21 TO NULL})
eyeQuery - (Name:A*) AND (EyeColor:blue)

var luceneQuery = session.Advanced.LuceneQuery<User>().WhereStartsWith(x => x.Name, "A");
var ageLuceneQuery = luceneQuery.WhereGreaterThan(x => x.Age, 21);
var eyeLuceneQuery = luceneQuery.WhereEquals(x => x.EyeColor, "blue");

luceneQuery - Name:A* 
ageLuceneQuery - Name:A* Age_Range:{Ix21 TO NULL}
eyeLuceneQuery - Name:A* Age_Range:{Ix21 TO NULL} EyeColor:blue

session.Advanced.LuceneQuery<User>().UsingDefaultOperator(QueryOperator.And);

using System;
using System.Linq;
using Raven.Client.Document;
using RavenDBSample01.Models;

namespace RavenDBSample01
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var store = new DocumentStore
            {
                Url = "http://localhost:8080"
            }.Initialize())
            {
                using (var session = store.OpenSession())
                {
                    int pageNumber = 0;
                    int resultsPerPage = 2;

                    var questions = session.Query<Question>()
                                           .Where(x => x.Title.StartsWith("Raven"))
                                           .Skip(pageNumber * resultsPerPage)
                                           .Take(resultsPerPage);
                    foreach (var question in questions)
                    {
                        Console.WriteLine(question.Title);
                    }
                }
            }
        }
    }
}

using System;
using System.Linq;
using Raven.Client.Document;
using RavenDBSample01.Models;
using Raven.Client;

namespace RavenDBSample01
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var store = new DocumentStore
            {
                Url = "http://localhost:8080"
            }.Initialize())
            {
                using (var session = store.OpenSession())
                {
                    int pageNumber = 0;
                    int resultsPerPage = 2;
                    RavenQueryStatistics stats;
                    var questions = session.Query<Question>()
                                           .Statistics(out stats)
                                           .Where(x => x.Title.StartsWith("Raven"))
                                           .Skip(pageNumber * resultsPerPage)
                                           .Take(resultsPerPage);
                    foreach (var question in questions)
                    {
                        Console.WriteLine(question.Title);
                    }

                    Console.WriteLine("TotalResults: {0}", stats.TotalResults);
                }
            }
        }
    }
}

var list = session.Query<Question>().Where(q => q.By.In<string>(arrayOfUsers))).ToArray()

 SELECT * FROM tbl WHERE data IN (1, 2, 3)

  public class Person
    {
        public int Id { get; set; }

        public string FirstName { get; set; }       

        public string LastName { get; set; }

    }

  public class PersonDTO
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public string Family { get; set; }

public string FullName { get; set; }

        public string Email { get; set; }
    }

 Mapper.CreateMap<Person, PersonDTO>().ForMember(des => des.Name, op => op.MapFrom(src => src.FirstName)).
                ForMember(des => des.FullName, op => op.MapFrom(src => src.FirstName + " " + src.LastName)).ForMember(
                    des => des.Email, op => op.Ignore());

AutoMapper.IMappingExpression<TSource,TDestination>.ForMember(System.Linq.Expressions.Expression<System.Func<TDestination,object>>, System.Action<AutoMapper.IMemberConfigurationExpression<TSource>>)

Mapper.AssertConfigurationIsValid();

var person = new Person
                {
                    Id = 1,
                    FirstName = "Mohammad",
                    LastName = "Saheb",
                    
                };
var personDTO = Mapper.Map<Person, PersonDTO>(person);

IEnumerable, IEnumerable<T>, ICollection, ICollection<T>, IList, IList<T>, List<T>.

var persons = new[]
                {
                    new Person { Id = 1, FirstName = "Mohammad", LastName = "Saheb" },
                    new Person { Id = 2, FirstName = "Babak", LastName = "Saheb" }
                };

var personDTOs = Mapper.Map<Person[], List<PersonDTO>>(persons);

public class Address
    {
        public string Ad1 { get; set; }
        public string Ad2 { get; set; }
    }


public class AddressDTO
    {
        public string Ad1 { get; set; }
        public string Ad2 { get; set; }
    }

Mapper.CreateMap<Address, AddressDTO>();

 Sugar
Butter

 IEnumerable<Ingredient> query = ingredients.Where((ingredient, index) => ingredient.Name == "Sugar" || index == 4);

 IEnumerable<Ingredient> gueryExpression =
from i in ingredients
where i.Calories >= 200
select i;

 IEnumerable<string> query = ingredients.Select(x => x.Name);

 IEnumerable<int> query = ingredients.Select(x => x.Name.Length);

{ Name = Sugar, Length = 5 }
{ Name = Egg, Length = 3 }
{ Name = Milk, Length = 4 }
{ Name = Flour, Length = 5 }
{ Name = Butter, Length = 6 }

 S
u
g
a
r
E
g
g
M
i
l
k
F
l
o
u
r
B
u
t
t
e
r

 Sugar
Egg
Milk

Sugar
Milk

 IEnumerable<Ingredient> query =
(from i in ingredients
  where i.Calories > 100
  select i).Take(2);
TakeWhile

 Sugar
Egg
Milk

 Flour
Butter

 First Page :
 - Sugar
 - Egg
Second Page :
 - Milk
 - Flour
Third Page :
 - Butter
SkipWhile

 Milk
Flour
Butter

public class Source
{
    public string Value1 { get; set; }
    public string Value2 { get; set; }
    public string Value3 { get; set; }
}

public class Destination
{
    public int Value1 { get; set; }
    public DateTime Value2 { get; set; }
    public Type Value3 { get; set; }
}

public class BooltoStringTypeConvertor : ITypeConverter<bool, string>
    {
        public string Convert(ResolutionContext context)
        {
            return (bool)context.SourceValue ? "Yes" : "No";
        }
    }

Mapper.CreateMap<bool,string>().ConvertUsing<BooltoStringTypeConvertor>();
            Mapper.CreateMap<Product, ProductDto>();
            Mapper.AssertConfigurationIsValid();

var product = new Product { Id = 1,Name ="PC" ,InStock = true };
var productDto = Mapper.Map<Product, ProductDto>(product);

public class Person
{
    public int Id { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }
}

public class PersonDTO
{
    public int Id { get; set; }

    public string RawData { get; set; }
}

public class CommaDelimetedResolver:ValueResolver<Person,string>
    {
        protected override string ResolveCore(Person source)
        {
            return string.Join(",", source.Id, source.FirstName, source.LastName);
        }
    }

Mapper.CreateMap<Person, PersonDTO>().ForMember(
                des => des.RawData, op => op.ResolveUsing<CommaDelimetedResolver>());


var person = new Person
{
Id = 1,
FirstName = "Mohammad",
LastName = "Saheb",
};

var personDTO = Mapper.Map<Person, PersonDTO>(person);

public class ShamsiFormatter:IValueFormatter
    {
        public string FormatValue(ResolutionContext context)
        {
            return ToShamsi(context.SourceValue.ToString());
        }
    }

Mapper.CreateMap<Person, PersonDTO>().ForMember(
            des => des.ShamsiDate, op => op.AddFormatter<ShamsiFormatter>());

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Data.Objects;
using System.Diagnostics;
using System.Linq;
using System.Web;
using System.Web.Caching;

namespace EfSecondLevelCaching.Core
{
    public static class EfHttpRuntimeCacheProvider
    {
        #region Methods (6)

        // Public Methods (2) 

        public static IList<TEntity> ToCacheableList<TEntity>(
                            this IQueryable<TEntity> query,
                            int durationMinutes = 15,
                            CacheItemPriority priority = CacheItemPriority.Normal)
        {
            return query.Cacheable(x => x.ToList(), durationMinutes, priority);
        }

        /// <summary>
        /// Returns the result of the query; if possible from the cache, otherwise
        /// the query is materialized and the result cached before being returned.
        /// The cache entry has a one minute sliding expiration with normal priority.
        /// </summary>
        public static TResult Cacheable<TEntity, TResult>(
                            this IQueryable<TEntity> query,
                            Func<IQueryable<TEntity>, TResult> materializer,
                            int durationMinutes = 15,
                            CacheItemPriority priority = CacheItemPriority.Normal)
        {
            // Gets a cache key for a query.
            var queryCacheKey = query.GetCacheKey();

            // The name of the cache key used to clear the cache. All cached items depend on this key.
            var rootCacheKey = typeof(TEntity).FullName;

            // Try to get the query result from the cache.
            printAllCachedKeys();
            var result = HttpRuntime.Cache.Get(queryCacheKey);
            if (result != null)
            {
                debugWriteLine("Fetching object '{0}__{1}' from the cache.", rootCacheKey, queryCacheKey);
                return (TResult)result;
            }

            // Materialize the query.
            result = materializer(query);

            // Adding new data.
            debugWriteLine("Adding new data: queryKey={0}, dependencyKey={1}", queryCacheKey, rootCacheKey);
            storeRootCacheKey(rootCacheKey);
            HttpRuntime.Cache.Insert(
                    key: queryCacheKey,
                    value: result,
                    dependencies: new CacheDependency(null, new[] { rootCacheKey }),
                    absoluteExpiration: DateTime.Now.AddMinutes(durationMinutes),
                    slidingExpiration: Cache.NoSlidingExpiration,
                    priority: priority,
                    onRemoveCallback: null);

            return (TResult)result;
        }

        /// <summary>
        /// Call this method in `public override int SaveChanges()` of your DbContext class 
        /// to Invalidate Second Level Cache automatically.
        /// </summary>        
        public static void InvalidateSecondLevelCache(this DbContext ctx)
        {
            var changedEntityNames = ctx.ChangeTracker
                                      .Entries()
                                      .Where(x => x.State == EntityState.Added ||
                                                  x.State == EntityState.Modified ||
                                                  x.State == EntityState.Deleted)
                                      .Select(x => ObjectContext.GetObjectType(x.Entity.GetType()).FullName)
                                      .Distinct()
                                      .ToList();

            if (!changedEntityNames.Any()) return;

            printAllCachedKeys();
            foreach (var item in changedEntityNames)
            {
                item.removeEntityCache();
            }
            printAllCachedKeys();
        }
        // Private Methods (4) 

        private static void debugWriteLine(string format, params object[] args)
        {
            if (!Debugger.IsAttached) return;
            Debug.WriteLine(format, args);
        }

        private static void printAllCachedKeys()
        {
            if (!Debugger.IsAttached) return;
            debugWriteLine("Available cached keys list:");
            int count = 0;
            var enumerator = HttpRuntime.Cache.GetEnumerator();
            while (enumerator.MoveNext())
            {
                if (enumerator.Key.ToString().StartsWith("__")) continue; // such as __System.Web.WebPages.Deployment
                debugWriteLine("queryKey: {0}", enumerator.Key.ToString());
                count++;
            }
            debugWriteLine("count: {0}", count);
        }

        private static void removeEntityCache(this string rootCacheKey)
        {
            if (string.IsNullOrWhiteSpace(rootCacheKey)) return;
            debugWriteLine("Removing items with dependencyKey={0}", rootCacheKey);
            // Removes all cached items depend on this key.
            HttpRuntime.Cache.Remove(rootCacheKey);
        }

        private static void storeRootCacheKey(string rootCacheKey)
        {
            // The cacheKeys of a cacheDependency that are not already in cache ARE NOT inserted into the cache 
            // on the Insert of the item in which the dependency is used.
            if (HttpRuntime.Cache.Get(rootCacheKey) != null)
                return;

            HttpRuntime.Cache.Add(
                rootCacheKey,
                rootCacheKey,
                null,
                Cache.NoAbsoluteExpiration,
                Cache.NoSlidingExpiration,
                CacheItemPriority.Default,
                null);
        }

        #endregion Methods
    }
}

var data = context.Products.AsQueryable().Cacheable(x => x.FirstOrDefault());

using System.Data.Entity;
using EfSecondLevelCaching.Core;
using EfSecondLevelCaching.Test.Models;

namespace EfSecondLevelCaching.Test.DataLayer
{
    public class ProductContext : DbContext
    {
        public DbSet<Product> Products { get; set; }

        public override int SaveChanges()
        {
            this.InvalidateSecondLevelCache();
            return base.SaveChanges();
        }        
    }
}

using System.Data.Entity;
using System.Linq;
using EfSecondLevelCaching.Core;
using EfSecondLevelCaching.Test.DataLayer;
using EfSecondLevelCaching.Test.Models;
using System;

namespace EfSecondLevelCaching
{
    public static class TestUsages
    {
        public static void RunQueries()
        {
            using (ProductContext context = new ProductContext())
            {
                var isActive = true;
                var name = "Product1";

                // reading from db
                var list1 = context.Products
                                   .OrderBy(one => one.ProductNumber)
                                   .Where(x => x.IsActive == isActive && x.ProductName == name)
                                   .ToCacheableList();

                // reading from cache
                var list2 = context.Products
                                   .OrderBy(one => one.ProductNumber)
                                   .Where(x => x.IsActive == isActive && x.ProductName == name)
                                   .ToCacheableList();

                // reading from cache
                var list3 = context.Products
                                   .OrderBy(one => one.ProductNumber)
                                   .Where(x => x.IsActive == isActive && x.ProductName == name)
                                   .ToCacheableList();

                // reading from db
                var list4 = context.Products
                                   .OrderBy(one => one.ProductNumber)
                                   .Where(x => x.IsActive == isActive && x.ProductName == "Product2")
                                   .ToCacheableList();
            }

            // removes products cache
            using (ProductContext context = new ProductContext())
            {
                var p = new Product()
                {
                    IsActive = false,
                    ProductName = "P4",
                    ProductNumber = "004"
                };
                context.Products.Add(p);
                context.SaveChanges();
            }

            using (ProductContext context = new ProductContext())
            {
                var data = context.Products.AsQueryable().Cacheable(x => x.FirstOrDefault());
                var data2 = context.Products.AsQueryable().Cacheable(x => x.FirstOrDefault());
                context.SaveChanges();
            }
        }
    }
}

Adding new data: queryKey=72AF5DA1BA9B91E24DCCF83E88AD1C5F, dependencyKey=EfSecondLevelCaching.Test.Models.Product

Available cached keys list:
queryKey: EfSecondLevelCaching.Test.Models.Product
queryKey: 72AF5DA1BA9B91E24DCCF83E88AD1C5F
count: 2

Fetching object 'EfSecondLevelCaching.Test.Models.Product__72AF5DA1BA9B91E24DCCF83E88AD1C5F' from the cache.

Available cached keys list:
queryKey: EfSecondLevelCaching.Test.Models.Product
queryKey: 72AF5DA1BA9B91E24DCCF83E88AD1C5F
count: 2

Fetching object 'EfSecondLevelCaching.Test.Models.Product__72AF5DA1BA9B91E24DCCF83E88AD1C5F' from the cache.

Available cached keys list:
queryKey: EfSecondLevelCaching.Test.Models.Product
queryKey: 72AF5DA1BA9B91E24DCCF83E88AD1C5F
count: 2

Adding new data: queryKey=11A2C33F9AD7821A0A31003BFF1DF886, dependencyKey=EfSecondLevelCaching.Test.Models.Product

Available cached keys list:
queryKey: 72AF5DA1BA9B91E24DCCF83E88AD1C5F
queryKey: 11A2C33F9AD7821A0A31003BFF1DF886
queryKey: EfSecondLevelCaching.Test.Models.Product
count: 3

Removing items with dependencyKey=EfSecondLevelCaching.Test.Models.Product
Available cached keys list:
count: 0
Available cached keys list:
count: 0

Adding new data: queryKey=02E6FE403B461E45C5508684156C1D10, dependencyKey=EfSecondLevelCaching.Test.Models.Product

Available cached keys list:
queryKey: 02E6FE403B461E45C5508684156C1D10
queryKey: EfSecondLevelCaching.Test.Models.Product
count: 2


Fetching object 'EfSecondLevelCaching.Test.Models.Product__02E6FE403B461E45C5508684156C1D10' from the cache.

 public static IEnumerable<TResult> OfType<TResult>(this IEnumerable source)

Apple
Sugar

Milk
Water

 Unhandled Exception: System.InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.String'.

 IEnumerable<string> input = new List<string> { "Apple", "Sugar", "Flour" };
string[] array = input.ToArray();

 IEnumerable<string> input = new[] { "Apple", "Sugar", "Flour" };
List<string> list = input.ToList();

Key=1, Recipe=Apple Pie
Key=2, Recipe=Cherry Pie
Key=3, Recipe=Beef Pie

 Rating 5
 - Apple Pie
 - Banana Pie
Rating 2
 - Cherry Pie
Rating 3
 - Beef Pie

 Sugar

 Milk

 Unhandled Exception: System.InvalidOperationException: Sequence contains no elements

Ingredient[] ingredients = { };
Ingredient element = ingredients.First();

 Unhandled Exception: System.InvalidOperationException: Sequence contains no matching element

 Ingredient[] ingredients = { };
Ingredient element = ingredients.FirstOrDefault();
Console.WriteLine(element == null);

 True

 True

 Flour

Unhandled Exception: System.InvalidOperationException: Sequence contains more than one matching element
Unhandled Exception: System.InvalidOperationException: Sequence contains no matching element

 Sugar

 Butter

True

 Milk

 System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

 True

Sugar
Egg
Milk

 True