CODEWITHSUNDEEP
c#reflection
Nick
Nick

Reputation: 7525

Passing string array parameters to Invoke method

I have this class:

using System.Linq;
  namespace TestNamespace {
     public class Program {
         public static void Main(string[] args) {
                //does stuff
          }
      }
    }

I am loading the above assembly and want to invoke the method with a string array parameter.

This gives me a null exception:

private static object[] parameters = new object[1];
string[] pa = { "1", "2" };
parameters[0] = pa;
//Creating target and other code
bool retVal = (bool)target.Invoke(null, parameters);

Any thoughts? Thanks

Upvotes: 0

Views: 5153

Answers (1)

jason
jason

Reputation: 241641

Where's the NullReferenceException. Are you sure that you're reflecting the MethodInfo correctly and that target is not null? That's my suspicion as to what's really going on here. If there were a NullReferenceException being thrown in the method, it would be wrapped in a TargetInvocationException and thus I suspect the NullReferenceException is because target is null.

To be clear, here's how you load and invoke the method:

var target = typeof(Program)
                 .GetMethod("Main", BindingFlags.Public | BindingFlags.Static);
bool retVal = (bool)target.Invoke(null, new object[] { pa });

The parameters parameter to MethodInfo.Invoke is an object[] with the same number, order and types of the parameters for the method being invoked. In your case, you have a single parameter of type string[]. Thus, the object[] parameter to MethodInfo.Invoke should be an array with one element, and that element is an instance of string[]. That is what I have accomplished with the syntax above.

Upvotes: 4

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