Support LINQKit query provider (#480)

Author: AlekseyMartynov

net/DevExtreme.AspNet.Data.Tests.EF6/Async.cs

@@ -21,6 +21,8 @@ await TestDbContext.ExecAsync(async context => {
                 await context.SaveChangesAsync();
 
                 await AsyncTestHelper.RunAsync(set);
+
+                await AsyncTestHelper.RunAsync(LinqKit.Extensions.AsExpandable(set));
             });
         }
 

net/DevExtreme.AspNet.Data.Tests.EF6/DevExtreme.AspNet.Data.Tests.EF6.csproj

@@ -39,6 +39,9 @@
     <Reference Include="EntityFramework.SqlServer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
       <HintPath>..\packages\EntityFramework.6.1.3\lib\net45\EntityFramework.SqlServer.dll</HintPath>
     </Reference>
+    <Reference Include="LinqKit.EntityFramework, Version=1.1.9.0, Culture=neutral, PublicKeyToken=b6c8cfc71f7a6a80, processorArchitecture=MSIL">
+      <HintPath>..\packages\LinqKit.EntityFramework.1.1.9.0\lib\net45\LinqKit.EntityFramework.dll</HintPath>
+    </Reference>
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.DataAnnotations" />

net/DevExtreme.AspNet.Data.Tests.EF6/packages.config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="EntityFramework" version="6.1.3" targetFramework="net45" />
+  <package id="LinqKit.EntityFramework" version="1.1.9.0" targetFramework="net461" />
   <package id="System.Data.Common" version="4.1.0" targetFramework="net461" />
   <package id="System.Data.SqlClient" version="4.1.0" targetFramework="net461" />
   <package id="xunit" version="2.4.1" targetFramework="net461" />

net/DevExtreme.AspNet.Data.Tests.EFCore/Async.cs

@@ -21,6 +21,10 @@ await TestDbContext.ExecAsync(async context => {
                 await context.SaveChangesAsync();
 
                 await AsyncTestHelper.RunAsync(set);
+
+#if EFCORE5
+                await AsyncTestHelper.RunAsync(LinqKit.Extensions.AsExpandable(set));
+#endif
             });
         }
 

net/DevExtreme.AspNet.Data.Tests.EFCore5/DevExtreme.AspNet.Data.Tests.EFCore5.csproj

@@ -6,6 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="LinqKit.Microsoft.EntityFrameworkCore" Version="5.0.24" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="xunit" Version="2.4.1" />

net/DevExtreme.AspNet.Data/QueryProviderInfo.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Reflection;
 
 namespace DevExtreme.AspNet.Data {
 
@@ -19,6 +20,7 @@ public QueryProviderInfo(IQueryProvider provider) {
             } else {
                 var type = provider.GetType();
                 var typeName = type.FullName;
+                var providerAssembly = type.Assembly;
 
                 if(typeName == "Microsoft.Data.Entity.Query.Internal.EntityQueryProvider" || typeName == "System.Data.Entity.Internal.Linq.DbQueryProvider")
                     IsEFClassic = true;
@@ -32,11 +34,23 @@ public QueryProviderInfo(IQueryProvider provider) {
                     IsL2S = true;
                 else if(typeName.StartsWith("MongoDB.Driver.Linq."))
                     IsMongoDB = true;
+                else if(typeName.StartsWith("LinqKit.ExpandableQueryProvider`1")) {
+                    switch(providerAssembly.GetName().Name) {
+                        case "LinqKit.Microsoft.EntityFrameworkCore":
+                            IsEFCore = true;
+                            providerAssembly = Assembly.Load("Microsoft.EntityFrameworkCore");
+                            break;
 
-                Version = type.Assembly.GetName().Version;
+                        case "LinqKit.EntityFramework":
+                            IsEFClassic = true;
+                            providerAssembly = Assembly.Load("EntityFramework");
+                            break;
+                    }
+                }
+
+                Version = providerAssembly.GetName().Version;
             }
         }
-
     }
 
 }