This exception is thrown in situations such as the following:

• A private, protected, or internal method that would not be accessible from normal compiled code is accessed from partially trusted code by using reflection.

• A security-critical method is accessed from transparent code.

• The access level of a method in a class library has changed, and one or more assemblies that reference the library have not been recompiled.

MethodAccessException uses the HRESULT COR_E_METHODACCESS, that has the value 0x80131510.

For a list of initial property values for an instance of MethodAccessException, see the MethodAccessException.#ctor constructors.

The following example demonstrates a scenario under which MethodAccessException is thrown.

The following code contains a class with a public method (MyMethod). This class is compiled into a class library.

using System;
namespace TestNameSpace 
{
 public class Class1
 {
   public Class1()
   {
     Console.WriteLine ("Constructing with public method.");
   }
   public void MyMethod () 
   {
     Console.WriteLine ("Calling MyMethod.");
   }
 }
}
      

The following code references the class library above, and accesses TestNameSpace.Class1.MyMethod. This code is compiled into an application.

using System;
using TestNameSpace;
class AppTest
{
 public static void Main()
 {
   Class1 test = new Class1();
   test.MyMethod();
 }
}
      

The output of the application is

The code for the class library is changed and recompiled so that TestNameSpace.Class1.MyMethod is no longer public. The following code changes MyMethod from public to private.

using System;
namespace TestNameSpace 
{
 public class Class1
 {
   public Class1()
   {
     Console.WriteLine ("Constructing with private method.");
   }
   private void MyMethod () 
   {
     Console.WriteLine ("Calling MyMethod.");
   }
 }
}
      

When the application is executed again without being recompiled, the output is