代码：
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
namespace 委托之Action与Func
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("【1】演示Action 委托：");
var actDele = new Action(TestMethods.SelfIntroduce);
actDele += TestMethods.SayHi;
actDele.Invoke();//调用委托
ShowTool.PrintDelimiter(50);
Console.WriteLine("【2.1】演示Func<int,int,int>委托：");
var func1 = new Func<int, int, int>(TestMethods.Add2Num);
Console.WriteLine("请输入第一个数：");
int a = ShowTool.GetNumInit();
Console.WriteLine("请输入第二个数：");
int b = ShowTool.GetNumInit();
Console.WriteLine(func1.Invoke(a, b));
ShowTool.PrintDelimiter(50);
Console.WriteLine("【2.2】演示Func<double,double,double>委托：");
var func2 = new Func<double,double,double>(TestMethods.Multiple2Num);
Console.WriteLine("请输入第一个数：");
double x = ShowTool.GetNumDouble();
Console.WriteLine("请输入第二个数：");
double y = ShowTool.GetNumDouble();
Console.WriteLine(func2.Invoke(x, y));
Console.ReadKey();
}
}
class TestMethods
{
internal static void SayHi()
{
Console.WriteLine("Hello,Dell Mao");
}
public static void SelfIntroduce()
{
Console.WriteLine("Hi,My name is Dell Mao!");
}
public static int Add2Num(int a, int b)
{
return a + b;
}
public static double Multiple2Num(double a, double b)
{
return a * b;
}
}
class ShowTool
{
public static void PrintDelimiter(int lenght)//打印一个分隔符
{
if (lenght < 8)
{
lenght = 8;
}
for (int i = 0; i < lenght; i++)
{
Console.Write("=");
}
Console.WriteLine();
}
public static int GetNumInit()
{
int a = 0;
try
{
a = Convert.ToInt32(Console.ReadLine());
return a;
}
catch (Exception)
{
MessageBox.Show("您输入的数据格式有误，将使用默认值0。");
return a;
}
}
public static double GetNumDouble()
{
double a = 0;
try
{
a = Convert.ToDouble(Console.ReadLine());
return a;
}
catch (Exception)
{
MessageBox.Show("您输入的数据格式有误，将使用默认值-999。");
return a;
}
}
}
}
运行结果：
