How to cast implicitly on a reflected method call

Question

I have a class Thing that is implicitly castable from a string. When I call a method with a Thing parameter directly the cast from s

Answer 1

The trick is to realize that the compiler creates a special static method called op_Implicit for your implicit conversion operator.

object arg = "foo";

// Program.showThing(Thing t)
var showThingReflected = GetType().GetMethod("showThing");

// typeof(Thing)
var paramType = showThingReflected.GetParameters()
                                  .Single()
                                  .ParameterType; 

// Thing.implicit operator Thing(string s)
var converter = paramType.GetMethod("op_Implicit", new[] { arg.GetType() });

if (converter != null)
    arg = converter.Invoke(null, new[] { arg }); // Converter exists: arg = (Thing)"foo";

// showThing(arg)
showThingReflected.Invoke(this, new[] { arg });