78 lines
1.1 KiB
C#
78 lines
1.1 KiB
C#
// Compiler options: -langversion:default
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//
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// Test for contravariance support in delegates
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//
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using System;
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public class A {
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protected string name;
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public A (string name)
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{
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this.name = "A::" + name;
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}
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public A ()
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{
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}
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public string Name {
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get {
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return name;
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}
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}
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}
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public class B : A {
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public B (string name)
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{
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this.name = "B::" + name;
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}
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public B ()
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{
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}
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}
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public class C : B {
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string value;
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public C (string name, string value)
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{
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this.name = "C::" + name;
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this.value = value;
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}
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public string Value {
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get {
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return value;
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}
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}
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}
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public class Tester {
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delegate void MethodHandler (C c1, C c2, C c3);
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static void MethodSample (B b, A a, C c)
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{
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Console.WriteLine ("b = {0}", b.Name);
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Console.WriteLine ("a = {0}", a.Name);
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Console.WriteLine ("c = {0}, {1}", c.Name, c.Value);
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}
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public static void Main ()
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{
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MethodHandler mh = MethodSample;
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C a = new C ("Hello", "hello");
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C b = new C ("World", "world");
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C c = new C ("!", "!!!");
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mh (b, a, c);
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}
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}
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