ASP.NET vNext Core CLR缺少type.IsPrimitive

该应用程序有很多反射代码,我必须缺少一些依赖关系,因为我正在得到如此代码的编译错误

Type.IsPrimitive,Type.GetConstructor Type.GetMethod Type.GetTypeArray
Error CS1061 ‘Type’ does not contain a definition for ‘IsPrimitive’ and no extension method ‘IsPrimitive’ accepting a first argument of type ‘Type’ could be found (are you missing a using directive or an assembly reference?)

Error CS1061 ‘Type’ does not contain a definition for ‘GetMethod’ and no extension method ‘GetMethod’ accepting a first argument of type ‘Type’ could be found (are you missing a using directive or an assembly reference?)

Error CS1061 ‘Type’ does not contain a definition for ‘GetProperties’ and no extension method ‘GetProperties’ accepting a first argument of type ‘Type’ could be found (are you missing a using directive or an assembly reference?)

Error CS1061 ‘Type’ does not contain a definition for ‘GetInterface’ and no extension method ‘GetInterface’ accepting a first argument of type ‘Type’ could be found (are you missing a using directive or an assembly reference?)

我的project.json文件中有以下依赖关系

"frameworks" : {
    "aspnetcore50" : { 
        "dependencies": {
            "System.Runtime": "4.0.20-beta-22416","System.Linq": "4.0.0.0-beta-22605","System.Reflection": "4.0.10.0-beta-22605","System.Reflection.Primitives": "4.0.0.0-beta-22605","System.Runtime.Extensions": "4.0.10.0-beta-22605","System.Reflection.Extensions": "4.0.0.0-beta-22605"
        }

以下编译在VS 2013和.Net 4.5下,但不会在VS 2015中使用上述依赖项进行编译

using System;
using System.Reflection;


namespace Project1
{
    public class Class1
    {
        public Class1()
        {
            Type lBaseArrayType = typeof(Array);
            Type lStringType = typeof(string);
            string[] lStringArray = new string[1];
            if (lStringType.IsPrimitive)
            {
            }
            ConstructorInfo lConstructor = lStringType.GetConstructor(new Type[0]);
            MethodInfo lMethod = lStringType.GetMethod("Equals");
            Type[] lTArray = Type.GetTypeArray(lStringArray);
            PropertyInfo[] lProps = lStringType.GetProperties();
        }
    }
}