| 9. 1. 1. Define a delegate with no return value and no parameters |
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- A delegate is an object that can refer to a method.
- The method referenced by delegate can be called through the delegate.
- A delegate in C# is similar to a function pointer in C/C++.
- The same delegate can call different methods.
- A delegate is declared using the keyword delegate.
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The general form of a delegate declaration: |
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delegate ret-type name(parameter-list);
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- ret-type is return type.
- The parameters required by the methods are specified in the parameter-list.
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A delegate can call only methods whose return type and parameter list match those specified by the delegate's declaration. |
All delegates are classes that are implicitly derived from System.Delegate. |
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using System;
delegate void FunctionToCall();
class MyClass
{
public void nonStaticMethod()
{
Console.WriteLine("nonStaticMethod");
}
public static void staticMethod()
{
Console.WriteLine("staticMethod");
}
}
class MainClass
{
static void Main()
{
MyClass t = new MyClass();
FunctionToCall functionDelegate;
functionDelegate = t.nonStaticMethod;
functionDelegate += MyClass.staticMethod;
functionDelegate += t.nonStaticMethod;
functionDelegate += MyClass.staticMethod;
functionDelegate();
}
}
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nonStaticMethod
staticMethod
nonStaticMethod
staticMethod |
