如何把匿名类型.GetType()返回的对象传进泛型里面[转]

//怎么取得匿名类型的Type放到
//泛型T当中？？

var 匿名 = new {
A = 0,
B = 1 };
Type t = 匿名.GetType();

//然后下面
var xx = dbContext.Database.SqlQuery<t>("sql");
//就悲剧了

var xx2 = dbContext.Database.SqlQuery<dynamic>("sql");
//xx2有列表,但是都是Object..~~~无法显示真实项,用Profile跟..SQL确实提交了.
求解释

msdn大神的解决办法

看到了所以记录下来

出现那个问题的原因是动态类型上没有 Entity Framework 需要的属性定义，Entity Framework 是通过反射类型上的属性来做映射的。为了解决这个问题，我用到了 Emit 技术，动态产生一个类型，并且动态写入 IL 代码产生属性。

代码如下，测试在 C# 4.0 上通过。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Entity;
using System.Collections;
using System.Reflection.Emit;
using System.Reflection;

namespace Demo
{
public class Program
{
public static void Main(string[] args)
{
string connectionString = "Server=(local); Integrated Security=true; Database=master";
using (DbContext context = new DbContext(connectionString))
{
TypeBuilder builder = Program.CreateTypeBuilder("MyDynamicAssembly", "MyModule", "MyType");
Program.CreateAutoImplementedProperty(builder, "name", typeof(string));
Program.CreateAutoImplementedProperty(builder, "type", typeof(string));
Program.CreateAutoImplementedProperty(builder, "id", typeof(int));

Type resultType = builder.CreateType();

dynamic queryResult = context.Database.SqlQuery(resultType, "SELECT * FROM sys.sysobjects");

Console.WriteLine("{0,20} {1,4} {2,10}", "Name", "Type", "ID");
foreach (dynamic item in queryResult)
{
Console.WriteLine("{0,10} {1,4} {2,10}", item.name, item.type, item.id);
}
}

Console.ReadKey();
}

public static TypeBuilder CreateTypeBuilder(string assemblyName, string moduleName, string typeName)
{
TypeBuilder typeBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName(assemblyName), AssemblyBuilderAccess.Run).DefineDynamicModule(moduleName).DefineType(typeName, TypeAttributes.Public);
typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);
return typeBuilder;
}

public static void CreateAutoImplementedProperty(TypeBuilder builder, string propertyName, Type propertyType)
{
const string PrivateFieldPrefix = "m_";
const string GetterPrefix = "get_";
const string SetterPrefix = "set_";

// Generate the field.
FieldBuilder fieldBuilder = builder.DefineField(string.Concat(PrivateFieldPrefix, propertyName), propertyType, FieldAttributes.Private);

// Generate the property
PropertyBuilder propertyBuilder = builder.DefineProperty(propertyName, PropertyAttributes.HasDefault, propertyType, null);

// Property getter and setter attributes.
MethodAttributes propertyMethodAttributes = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;

// Define the getter method.
MethodBuilder getterMethod = builder.DefineMethod(string.Concat(GetterPrefix, propertyName), propertyMethodAttributes, propertyType, Type.EmptyTypes);

// Emit the IL code.
// ldarg.0
// ldfld,_field
// ret
ILGenerator getterILCode = getterMethod.GetILGenerator();
getterILCode.Emit(OpCodes.Ldarg_0);
getterILCode.Emit(OpCodes.Ldfld, fieldBuilder);
getterILCode.Emit(OpCodes.Ret);

// Define the setter method.
MethodBuilder setterMethod = builder.DefineMethod(string.Concat(SetterPrefix, propertyName), propertyMethodAttributes, null, new Type[] { propertyType });

// Emit the IL code.
// ldarg.0
// ldarg.1
// stfld,_field
// ret
ILGenerator setterILCode = setterMethod.GetILGenerator();
setterILCode.Emit(OpCodes.Ldarg_0);
setterILCode.Emit(OpCodes.Ldarg_1);
setterILCode.Emit(OpCodes.Stfld, fieldBuilder);
setterILCode.Emit(OpCodes.Ret);

propertyBuilder.SetGetMethod(getterMethod);
propertyBuilder.SetSetMethod(setterMethod);
}
}
}

转自：http://www.cnblogs.com/0banana0/archive/2012/05/05/2484698.html

注：这样应该可以轻松实现 DataTable To Class