C#中的委托样例代码

C#中的委托样例代码(一)

using System;
namespace Wrox.ProCSharp.AdvancedCSharp
{
    delegate double DoubleOp(double x);

    class MainEntryPoint
    {
        static void Main()
        {
            DoubleOp[] operations =
            {
               new DoubleOp(MathsOperations.MultiplyByTwo),
               new DoubleOp(MathsOperations.Square)
            };

            for (int i = 0; i < operations.Length; i++)
            {
                Console.WriteLine("Using operations[{0}]:", i);
                ProcessAndDisplayNumber(operations[i], 2.0);
                ProcessAndDisplayNumber(operations[i], 7.94);
                ProcessAndDisplayNumber(operations[i], 1.414);
                Console.WriteLine();
            }
        }

        static void ProcessAndDisplayNumber(DoubleOp action, double value)
        {
            double result = action(value);
            Console.WriteLine("Value is {0}, result of operation is {1}", value, result);
        }
    }

    class MathsOperations
    {
        public static double MultiplyByTwo(double value)
        {
            return value * 2;
        }

        public static double Square(double value)
        {
            return value * value;
        }
    }
}

C#中的委托样例代码(二)

Posted on 2004-06-04 14:17 集思 阅读(505)

using System;
namespace Wrox.ProCSharp.AdvancedCSharp
{
    delegate void DoubleOp(double value);

    class MainEntryPoint
    {
        static void Main()
        {
            DoubleOp operations = new DoubleOp(MathsOperations.MultiplyByTwo);
            operations += new DoubleOp(MathsOperations.Square);

            ProcessAndDisplayNumber(operations, 2.0);
            ProcessAndDisplayNumber(operations, 7.94);
            ProcessAndDisplayNumber(operations, 1.414);
            Console.WriteLine();
        }

        static void ProcessAndDisplayNumber(DoubleOp action, double value)
        {
            Console.WriteLine(" ProcessAndDisplayNumber called with value = " + value);
            action(value);
        }
    }

    class MathsOperations
    {
        public static void MultiplyByTwo(double value)
        {
            double result = value*2;
            Console.WriteLine("Multiplying by 2: {0} gives {1}", value, result);
        }

        public static void Square(double value)
        {
            double result = value*value;
            Console.WriteLine("Squaring: {0} gives {1}", value, result);
        }
    }
}