FIX: "System.Security.SecurityException" Error Message Occurs When You Invoke a Method on a Transparent Proxy (327441)

MORE INFORMATION

Steps to Reproduce the Behavior

1. Create a new Microsoft C# Console Application and name it TestClass.
2. Paste the following code to the Class1.cs file:

   using System;
   using System.Reflection;
   using System.Security.Permissions;
   
   // To refuse the UnmanagedCode permission
   [assembly: SecurityPermission(SecurityAction.RequestRefuse, UnmanagedCode=true)]
   
   interface ITest
   {
   	void Test();
   }
   
   class TestClass: MarshalByRefObject, ITest
   {
   	public static void Main(String[] args)
   	{
   		AppDomain ad = AppDomain.CreateDomain("NewDomain", null, null);
   
   		TestClass proxy = (TestClass)ad.CreateInstance("TestClass", "TestClass").Unwrap();
   
   		ITest i = proxy as ITest;
   		i.Test();
   	}
   	public void Test()
   	{
   		Console.WriteLine("Test");
   	}
   }
   					

3. Compile the code and then run the code. The SecurityException is thrown.
4. You can use the following code sample to demonstrate the use of an "abstract class", which resolves this problem:

   using System;
   using System.Reflection;
   using System.Security.Permissions;
   
   // To refuse the UnmanagedCode permission
   [assembly: SecurityPermission(SecurityAction.RequestRefuse, UnmanagedCode=true)]
   
   abstract class CTest : MarshalByRefObject
   {
   	public abstract void Test();
   }
   
   class TestClass: CTest
   {
   	public static void Main(String[] args)
   	{
   		AppDomain ad = AppDomain.CreateDomain("NewDomain", null, null);
   
   		TestClass proxy = (TestClass)ad.CreateInstance("TestClass", "TestClass").Unwrap();
   
   		CTest i = proxy as CTest;
   		i.Test();
   	}
   	public override void Test()
   	{
   		Console.WriteLine("Test");
   	}
   }