static void Main(string[] args)
{
// Approach 1:
SampleDelegate1 del1 = new SampleDelegate1(SampleMethodOne);
SampleDelegate1 del2 = new SampleDelegate1(SampleMethodTwo);
SampleDelegate1 del3 = new SampleDelegate1(SampleMethodThree);
// In this example del4 is a multicast delegate. You use +(plus)
// operator to chain delegates together and -(minus) operator to remove.
SampleDelegate1 del4 = del1 + del2 + del3 - del2;
del4();
// Approach 2:
// In this example del is a multicast delegate. You use += operator
// to chain delegates together and -= operator to remove.
SampleDelegate2 delAp2 = new SampleDelegate2(SampleMethodOne);
delAp2 += SampleMethodTwo;
delAp2 += SampleMethodThree;
delAp2 -= SampleMethodTwo;
del2();
// Multicast delegate with an int return type:
SampleDelegate3 delAp3 = new SampleDelegate3(SampleMethodOneInt);
delAp3 += SampleMethodTwoInt;
// The ValueReturnedByDelegate will be 2, returned by the SampleMethodTwo(),
// as it is the last method in the invocation list.
int ValueReturnedByDelegate = delAp3();
Console.WriteLine("Returned Value = {0}", ValueReturnedByDelegate);
// Multicast delegate with an integer output parameter:
SampleDelegate4 delAp4 = new SampleDelegate4(SampleMethodOne);
delAp4 += SampleMethodTwo;
// The ValueFromOutPutParameter will be 2, initialized by SampleMethodTwo(),
// as it is the last method in the invocation list.
int ValueFromOutPutParameter = -1;
delAp4(out ValueFromOutPutParameter);
Console.WriteLine("Returned Value = {0}", ValueFromOutPutParameter);
}
static void Main()
{
// ラムダ式によるデリゲート
SampleDelegate3 d = n => - n;
Console.WriteLine(d(3)); // 結果:-3
// Action<int>は、戻り値のない引数ひとつの定義済み汎用デリゲート
Action <int> disp = n => { Console.WriteLine(n); }; // 結果:123
disp(123);
// Func<string, int>は、戻り値と引数ひとつの定義済み汎用デリゲート
Func <string, int> hex2int = str => Convert.ToInt32(str, 16);
Console.WriteLine(hex2int("CD")); // 出力値:205
}
