// What is a delegate
// ==================
// A delegate is a type that represents references to methods with a particular parameter list and return type.
public void Main()
{
//Assigning an existing function
DoWorkDelegate doWorkDelegate = DoWork;
//Assigning to an anonymous method (C# 2.0)
DoWorkDelegate anonymousFunctionDelegate = delegate()
{
Console.WriteLine("Work done from anonymous function !");
};
//Assigning to an anonymous method (C# 3.0)
DoWorkDelegate lambdaDelegate = () => Console.WriteLine("Work done from lambda expression !");
//Invoking a delegate's method
doWorkDelegate.Invoke();
anonymousFunctionDelegate.Invoke();
lambdaDelegate.Invoke();
//Method chaining
Console.WriteLine();
Console.WriteLine("Method chaining");
Console.WriteLine("==================");
doWorkDelegate += DoOtherWork;
doWorkDelegate.Invoke();
//Using a delegate with params and a return type
Console.WriteLine();
Console.WriteLine("Delegate with params and a return type");
Console.WriteLine("==================");
DoWorkAndReturnStuffDelegate delegateWithParamsAndReturnType = DoWorkAndReturnStuff;
string result = delegateWithParamsAndReturnType.Invoke("Test input");
Console.WriteLine($"Delegate invocation result: {result}");
}
public void Demo01()
{
// DoWork();
Debug.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId.ToString());
DoWorkDelegate m = new DoWorkDelegate(DoWork);
m.Invoke();
AsyncCallback callback = new AsyncCallback(TheCallback);
IAsyncResult ar = m.BeginInvoke(callback, m);
//// do more
ar.AsyncWaitHandle.WaitOne();
}