PRB: "System.Reflection.TargetInvocationException" Error Message When You Call the MethodInfo.Invoke Method (828991)

MORE INFORMATION

Steps to Reproduce the Behavior

1. Start Visual Studio .NET.
2. Use either Visual C# .NET or Visual Basic .NET to create a Class Library project.
   
   By default, the Class1 class is created.
3. Build this project to create the ClassLibrary1.dll assembly.
4. Use either Visual C# .NET or Visual Basic .NET to add a new Class Library project to your solution.
   
   By default, the Class1 class is created.
5. In the ClassLibrary2 project, add a project reference to the ClassLibrary1.dll assembly that you built in step 3.
6. If you are using Visual C# .NET, locate the following code in the Class1.cs file of the ClassLibrary2 project:

   public Class1()
   {
      //
      // TODO: Add constructor logic here
      //
   }

   If you are using Visual Basic .NET, locate the following code in the Class1.vb file of the ClassLibrary2 project:

   Public Class Class1

7. If you are using Visual C# .NET, add the following code after the code that you located in the previous step:

   public string GetString()
   {
      return new ClassLibrary1.Class1().ToString();
   }

   If you are using Visual Basic .NET, add the following code after the code that you located in the previous step:

   Public Function GetString() As String
      Return New ClassLibrary1.Class1().ToString()
   End Function

8. Build the ClassLibrary2 project to create the ClassLibrary2.dll assembly.
9. Use either Visual C# .NET or Visual Basic .NET to add a new Console Application project to your solution.
   
   By default, the Class1 class is created in Visual C# .NET, and the Module1 module is created in Visual Basic .NET.
10. If you are using Visual C# .NET, locate the following code in the Class1.cs file of the ConsoleApplication1 project:

    using System;

    If you are using Visual Basic .NET, locate the following code in the Module1.vb file of the ConsoleApplication1 project:

    Module Module1

11. If you are using Visual C# .NET, add the following code after the code that you located in the previous step:

    using System.Reflection;

    If you are using Visual Basic .NET, add the following code before the code that you located in the previous step:

    Imports System.Reflection

12. If you are using Visual C# .NET, add the following code to the Main method of the Class1 class:

    Assembly myAssembly;
    myAssembly = Assembly.LoadFrom(@"C:\828991\ClassLibrary2\bin\Debug\ClassLibrary2.dll");
    Type myType = myAssembly.GetTypes()[0];
    MethodInfo myMethod = myType.GetMethod("GetString");
    object obj = myAssembly.CreateInstance(myType.FullName);
    Console.WriteLine("ClassLibrary1.GetString() result: {0}", myMethod.Invoke(obj, null));

    Note In the Assembly.LoadFrom method, use an appropriate path that corresponds to the location of the ClassLibrary2.dll assembly on your computer.
    
    If you are using Visual Basic .NET, add the following code to the Main method of the Module1 module:

    Dim MyAssembly As [Assembly]
    MyAssembly = [Assembly].LoadFrom("C:\828991\ClassLibrary2\bin\ClassLibrary2.dll")
    Dim MyType As Type = MyAssembly.GetTypes()(0)
    Dim MyMethod As MethodInfo = MyType.GetMethod("GetString")
    Dim Obj As Object = MyAssembly.CreateInstance(myType.FullName)
    Console.WriteLine("ClassLibrary1.GetString() result: {0}", MyMethod.Invoke(obj, Nothing))

    Note In the Assembly.LoadFrom method, use an appropriate path that corresponds to the location of the ClassLibrary2.dll assembly on your computer.
13. Build the ConsoleApplication1 project to create the ConsoleApplication1.exe file.
14. Start Notepad.
15. Type the following text in Notepad:
    
    This is not an assembly.
16. Save the Notepad document as ClassLibrary1.dll in the same location as the ConsoleApplication1.exe file that you built in step 13.
17. From the command prompt, run the ConsoleApplication1.exe file.
    
    You notice the behavior that is mentioned in the "Symptoms" section.