Question

I want to load an assembly (dll-test.dll), and run the method GetLabel:

namespace Dlltest.Test
{
    public class Main
    {
        public string GetLabel()
        {
            string test = "TestString";
            return test;
        }
    }
}

I have the following code however I cannot get to run GetLabel:

Assembly assembly = Assembly.LoadFile(@"C:\dll-test.dll");
Type type = assembly.GetType();
var obj = Activator.CreateInstance(type);

var result = type.InvokeMember("GetLabel",
                              BindingFlags.Default | BindingFlags.InvokeMethod,
                              null,
                              obj,
                              null);

MessageBox.Show(result.ToString);

It should show a message box with TestString.

Edit

I eventually made it working with:

Assembly assembly = Assembly.LoadFile(@"C:\dll-test.dll");
var type = assembly.GetTypes();
var obj = Activator.CreateInstance(type[0]);

var result = type[0].InvokeMember("GetLabel",
                          BindingFlags.Default | BindingFlags.InvokeMethod,
                          null,
                          obj,
                          null);

MessageBox.Show(result.ToString());

Answer 1

In line

Type type = assembly.GetType();

you’re assigning type of assembly variable instead of the type that you want. Try assembly.GetType(type_name). Moreover change “GetGabel” into “GetLabel” 🙂