C# 7 and .NET Core 2.0 High Performance

Delegates

Delegates are a type in .NET which hold the reference to the method. The type is equivalent to the function pointer in C or C++. When defining a delegate, we can specify both the parameters that the method can take and its return type. This way, the reference methods will have the same signature.

Here is a simple delegate that takes a string and returns an integer:

delegate int Log(string n);

Now, suppose we have a LogToConsole method that has the same signature as the one shown in the following code. This method takes the string and writes it to the console window:

static int LogToConsole(string a) { Console.WriteLine(a); 
  return 1; 
}   

We can initialize and use this delegate like this:

Log logDelegate = LogToConsole; logDelegate ...