Parameter count mismatch with Invoke?

Question

The code block below results in the error: TargetParameterCountException was unhandled by user code. Parameter count mismatch.

    public void AddListViewIt         


        

Answer 1

The error occurs because of array covariance; an array of strings is assignable to object[]. This causes the Invoke method to treat each element of the string array as if it should be an argument to the AddListViewItem method.

Here's a fix:

Invoke(new Action(AddListViewItem), new object[] {Data});

(or)

Invoke(new Action(AddListViewItem), (object)Data);

This makes it crystal-clear to Invoke that the target method takes a single parameter.