Delegates - Illustrated C# 2005 - page 345

Figure 15-9. The return value of the last method executed is the value returned by the delegate.

Invoking Delegates with Reference Parameters
If a delegate has a reference parameter, the value of the parameter can change upon return
from one or more of the methods in the invocation list.

￿ When calling the next method in the invocation list, the new value of the parameter is the

one passed to the next method.

For example, the following code invokes a delegate with a reference parameter. Figure 15-10
illustrates the code.

delegate void MyDel( ref int X );

class MyClass {
public void Add2(ref int x) { x += 2; }
public void Add3(ref int x) { x += 3; }
static void Main(string[] args)
{
MyClass mc = new MyClass();

MyDel mDel = mc.Add2;
mDel += mc.Add3;
mDel += mc.Add2;

int x = 5;
mDel(ref x);

Console.WriteLine("Value: {0}", x);
}
}