Question

So I’m performing tests on a dll with the following:

--test.dll--
namespace MyNamespace
{
    internal class foo
    {
        private static bar myBarClass = new bar();
    ]

    internal class bar
    {
        public void aMethod();
    }
}
----

Now in another program I have an existing instance of foo (obtained via reflection). Now I want to call the method aMethod() from the myBarClass within the existing instance of foo. Not sure how to do this.

foo myFooObject = GetInstanceOfFoo();  //i get an instance of foo via reflection

Assembly testAssembly= Assembly.LoadFrom(c:\test.dll);
object o = testAssembly.CreateInstance("MyNamespace.bar");
Type t = o.GetType();
BindingFlags bf = BindingFlags.Instance | BindingFlags.NonPublic;
MethodInfo mi = t.GetMethod("aMethod", bf);
mi.Invoke(<notsurewhatgoeshere!>, null);

I am able to get the correct method info. My question is in mi.Invoke, how to I invoke the method on the already existing instance of foo.bar?

Thanks

Answer 1

var myBarClass = testAssembly.GetType("MyNamespace.foo")
                             .GetField("myBarClass", BindingFlags.NonPublic |
                                                     BindingFlags.Static)
                             .GetValue(null);
mi.Invoke(myBarClass, null);

Note that you do not need to construct your own instance (as you already are) because you won’t be using it anyway.

So the complete code you would use is:

Assembly testAssembly= Assembly.LoadFrom(@"c:\test.dll");
Type t = testAssembly.GetType("MyNamespace.bar");
BindingFlags bf = BindingFlags.Instance | BindingFlags.NonPublic;
MethodInfo mi = t.GetMethod("aMethod", bf);
object myBarClass = testAssembly.GetType("MyNamespace.foo")
                                .GetField("myBarClass", BindingFlags.NonPublic |
                                                        BindingFlags.Static)
                                .GetValue(null);
mi.Invoke(myBarClass, null);