As the documentation for MethodInfo.Invoke states, the first argument is ignored for static methods so you can just pass null.
foreach (var tempClass in macroClasses)
{
// using reflection I will be able to run the method as:
tempClass.GetMethod("Run").Invoke(null, null);
}
As the comment points out, you may want to ensure the method is static when calling GetMethod
:
tempClass.GetMethod("Run", BindingFlags.Public | BindingFlags.Static).Invoke(null, null);