C# add event handler literal code block

问题

Is it possible to add a literal code block as an event handler in C#? Something like:

Timer t = new Timer(1000);
t.Elapsed += new ElapsedEventHandler({ Console.WriteLine("Tick"); });

You can do this in PowerShell, so I thought there might be some way to do this in C# too.

回答1:

You can use a lambda expression (C# 3.0 and higher):

t.Elapsed += (sender, args) => Console.WriteLine("Tick");

or an anonymous method (C# 2.0 and higher):

// If you don't need the parameter values
t.Elapsed += delegate { Console.WriteLine("Tick"); };

// If you do need the parameter values
t.Elapsed += delegate(Object sender, ElapsedEventArgs args) {
    Console.WriteLine("Tick from {0}", sender); 
};

回答2:

t.Elapsed += delegate(object sender, ElapsedEventArgs args)
             { 
                 Console.WriteLine["Tick"]; 
             });

Or, you could also use lambda syntax:

t.Elapsed += (sender, args) => { Console.WriteLine["Tick"]; };

来源：https://stackoverflow.com/questions/7530743/c-sharp-add-event-handler-literal-code-block