Author Topic: C# Reflection "Exception has been thrown by the target of an invocation"[Solved]  (Read 5632 times)


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How to resolve the error in C# Reflection "Exception has been thrown by the target of an invocation"?

The most likely problem would be, you are invoking the method using C# reflection with wrong number of arguments. Refer to the following example, the function AddTwoNumbers would take only 3 arguments - 2 input and 1 output. If you give more or less number of arguments, you will get this error.

using System.Reflection;

namespace SFTCSClientConsole
    class Program
        static void Main(string[] args)

                Type mathType = Type.GetTypeFromProgID("SFTComServer.MathControl");

                object mathInstance = Activator.CreateInstance(mathType);

                object[] arguments = new object[5] { 10, 15, 25, 45, 55 };  // Would produce error - Exception has been thrown by the target of an invocation 

                object result = mathType.InvokeMember("AddTwoNumbers", BindingFlags.InvokeMethod,
                     null, mathInstance, arguments);

                if(arguments[2] != null)


Additional Information: For server code, refer to the attachment:


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