C# Parameter count mismatch error while passing object array in invoke method( Reflection)

Question

HI ,I am trying to call funtion dynamically here and passing argument , dont know why it throws error there.

Assembly objAssembly;
objAssembly = Assembly.GetExecutingAssembly();

//get the class type information in which late bindig applied 
Type classType = objAssembly.GetType("Project." +strClassname);

//create the instance of class using System.Activator class 
object obj = Activator.CreateInstance(classType);

//fixed object  objValue[5];/* = new object[5];
object[] _objval = new object[3];

MethodInfo mi = classType.GetMethod("perFormAction");
mi.Invoke(obj, **_objval**); // Error here ..

I dont know why it throws parameter count mismatch here . Is anyone can help me . Thanks

Answer 1

In your real code, do you fill the _objVal array or not ? If you don't, there's possibly the issue that MethodInfo.Invoke needs to know the type of the parameters in order to find the potentially overloaded method.

And what is the signature of the perFormAction method ?

Answer 2

Ok - so notice that the parameter to your method is a single parameter whose type is object array. Hence you need pass it in the same way. For example,

object[] _objval = new object[3];
....     // Fill the array with values to be supplied here
object[] parameters = new object[] { _objval }; // one parameter of type object array
...
mi.Invoke(obj, parameters);