怎么传委托

[kangbo818]

其他类中不能定义本类中的，怎么将委托传到其他类？
给个例子看看

[threenewbee]

1 定义委托：

public delegate void TestDelegate(string sParam);

2 传递委托：

public void Func(TestDelegate td, string sParam)
{
    if (td != null) td(sParam);
}

3 使用委托：

Func(delegate(string sParam) { Console.WriteLine(sParam); }, "Hello");

[ws_hgo]

using System;   
using System.Collections.Generic;   
using System.Text;   
  
namespace ConsoleApplication1   
{   
    class 简单的委托实例   
    {   
        public static double Area(double Val)   
        {   
            return Val * 2;   
        }   
        public static double Scare(double Val)   
        {   
            return Val * Val;   
        }   
    }   
    class Test   
    {   
        public delegate double delegateTest(double dd);   
        static void Main()   
        {   
            //实例化了个委托数组,（一旦定义了委托类,就可以实例化它的实例）   
            delegateTest[] Operations =   
                {   
                    //说明了委托的一种方式,把方法组合到数组   
                  new delegateTest(简单的委托实例.Area),   
                  new delegateTest(简单的委托实例.Scare)    
                };   
            for (int i = 0; i < Operations.Length; i++)   
            {   
                Console.WriteLine("Using Operations[{0}]", i);   
                Test MyTest = new Test();   
  
                //把委托传递给ProcessDelagate()这个方法,Operations[0]可以理解成delegateTest Operations =new delegateTest(简单的委托实例.Area);调用ProcessDelagate这个方法的时候Operations代理的方法是简单的委托实例.Area   
                MyTest.ProcessDelagate(Operations[i], 12.0);   
                MyTest.ProcessDelagate(Operations[i], 2.0);   
                Console.WriteLine();   
            }   
        }   
        //把委托作为一个参数传递到ProcessDelagate()第一个参数中   
        void ProcessDelagate(delegateTest Action, double d)   
        {   
            double Result = Action(d);   
            Console.WriteLine("提供的值是{0},结果是{1}", d, Result);   
        }   
    }   
}  

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/ws_hgo/archive/2009/07/25/4380293.aspx

[ws_hgo]

using System;   
using System.Collections.Generic;   
using System.Text;   
  
namespace ConsoleApplication1   
{   
    //如果要多次调用这个方法,那么就要多次调用这个委托,委托包含多个方法,这个种委托就是多播委托！   
    class 多播委托   
    {   
        //用的是void没有返回值   
        public delegate void DelageteTest(double val);   
        static void Main()   
        {   
            //多播委托中添加2个方法   
            DelageteTest MyTest = new DelageteTest(Test.Area);   
            MyTest += new DelageteTest(Test.Scare);   
            //下面的代码跟上面的3行代码是等价的   
            //DelageteTest MyTest;   
            //DelageteTest Test1 = new DelageteTest(Test.Area);   
            //DelageteTest Test2 = new DelageteTest(Test.Scare);   
            //MyTest = Test1 + Test2;   
  
            多播委托 多 = new 多播委托();   
            多.OPreation(MyTest, 2.0);   
            多.OPreation(MyTest, 12.0);   
        }   
        void OPreation(DelageteTest Action, double d)   
        {   
            Action(d);   
        }   
    }   
    class Test   
    {   
        public static void Area(double Val)   
        {   
            Console.WriteLine(Val * 2);   
        }   
        public static void Scare(double Val)   
        {   
            Console.WriteLine(Val * Val);   
        }   
    }   
  
}  


本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/ws_hgo/archive/2009/07/25/4380293.aspx

[ws_hgo]

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
public delegate bool DelegateTest(object obj1, object obj2);
class Class1
{
static void Main()
{
Employee[] Employees =
{
new Employee("huguo",1000000),
new Employee("lili",20000),
new Employee("lulu",30000),
new Employee("xixi",50000),
new Employee("jianjian",10000),
new Employee("yoyo",9000)
};
//委托DelegateTest代理的方法是Greate
DelegateTest MyTest = new DelegateTest(Employee.Greate);
Sorter MySort = new Sorter();
//冒泡算法中第一个参数是对应Employees数组信息,第二个参数是委托
MySort.Sort(Employees, MyTest);
for (int m = 0; m < Employees.Length; m++)
{
Console.WriteLine(Employees[m].ToString());
}
}
}
class Employee
{
public string Name;
public int Salary;
public Employee(string Name, int Salary)
{
this.Name = Name;
this.Salary = Salary;
}
//用override重写string方法
public override string ToString()
{
return string.Format(Name + ",{0:C},", Salary);
}
//定义一个方法,如果obj2传过来的 Salary大于obj1就返回true;
public static bool Greate(object obj1, object obj2)
{
Employee Employee1 = (Employee)obj1;
Employee Employee2 = (Employee)obj2;
return (Employee2.Salary > Employee1.Salary) ? true : false;
}
}
class Sorter
{
public void Sort(object[] ArrayObj, DelegateTest Test)
{
//下面就是冒泡算法啦
for (int i = 0; i < ArrayObj.Length; i++)
{
for (int j = i + 1; j < ArrayObj.Length; j++)
{
if (Test(ArrayObj[j], ArrayObj[i]))
{
object Temp = ArrayObj[i];
ArrayObj[i] = ArrayObj[j];
ArrayObj[j] = Temp;
}
}
}
}
}

}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/ws_hgo/archive/2009/07/25/4380283.aspx

[liffe]

一楼的不错！顶

[微创社（MCC）]

类名.委托名(...)

[angel6709]

ding

[acqy]

委托其实就是一种类型，把它看成是class，你就容易理解如何去传递它了

[哼哼哈嘿1986]

每天回帖，得10分
没办法，2楼，3楼把我要说的都说咯

[NewUser2008]

[Quote=引用 9 楼 waiwaihai 的回复:]
每天回帖，得10分
没办法，2楼，3楼把我要说的都说咯
[/Quote]

那确实!