Calling a static method using a Type

Question

How do I call a static method from a Type, assuming I know the value of the Type variable and the name of the static method?

public class FooClass {     public static FooMethod() {         //do something     } }  public class BarClass {     public void BarMethod(Type t) {         FooClass.FooMethod()          //works fine         if (t is FooClass) {             t.FooMethod();            //should call FooClass.FooMethod(); compile error         }     } } 

So, given a Type t, the objective is to call FooMethod() on the class that is of Type t. Basically I need to reverse the typeof() operator.

Answer 1

You need to call MethodInfo.Invoke method:

public class BarClass {     public void BarMethod(Type t) {         FooClass.FooMethod(); //works fine         if (t == typeof(FooClass)) {             t.GetMethod("FooMethod").Invoke(null, null); // (null, null) means calling static method with no parameters         }     } } 

Of course in the above example you might as well call FooClass.FooMethod as there is no point using reflection for that. The following sample makes more sense:

public class BarClass {     public void BarMethod(Type t, string method) {         var methodInfo = t.GetMethod(method);         if (methodInfo != null) {             methodInfo.Invoke(null, null); // (null, null) means calling static method with no parameters         }     } }  public class Foo1Class {   static public Foo1Method(){} } public class Foo2Class {   static public Foo2Method(){} }  //Usage new BarClass().BarMethod(typeof(Foo1Class), "Foo1Method"); new BarClass().BarMethod(typeof(Foo2Class), "Foo2Method");