C#委托初級使用的實例代碼

delegate double ProcessDelegate(double param1, double param2);

static double Muliply(double param1, double param2)
{
return param1 * param2;
}

static double Divide(double param1, double param2)
{
return param1 / param2;
}

static void Main(string[] args)
{
ProcessDelegate process;
Console.WriteLine("Enter 2 numbers separated with a comma:");
string input = Console.ReadLine();
int commaPos = input.IndexOf(",");
double param1 = Convert.ToDouble(input.Substring(0,commaPos));
double param2 = Convert.ToDouble(input.Substring(commaPos+1,input.Length -commaPos -1));
Console.WriteLine("Enter M to multiply or D to divide:");
input = Console.ReadLine();
if (input.Equals("M"))
{
process = new ProcessDelegate(Muliply);
}
else {
process = new ProcessDelegate(Divide);
}
Console.WriteLine("Result: {0}",process(param1,param2));
Console.ReadKey();
}