[C#] 委托Action和Func / 憋错料

一、说明

一般我们定义委托都是有如下两步：

public delegate void MyDelegate(string name);//定义委托

public MyDelegate myDelegate; //使用委托

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{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
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.csharpcode .lnum { color: #606060; }



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{

	font-size: small;

	color: black;

	font-family: consolas, "Courier New", courier, monospace;

	background-color: #ffffff;

	/*white-space: pre;*/

}

.csharpcode pre { margin: 0em; }

.csharpcode .rem { color: #008000; }

.csharpcode .kwrd { color: #0000ff; }

.csharpcode .str { color: #006080; }

.csharpcode .op { color: #0000c0; }

.csharpcode .preproc { color: #cc6633; }

.csharpcode .asp { background-color: #ffff00; }

.csharpcode .html { color: #800000; }

.csharpcode .attr { color: #ff0000; }

.csharpcode .alt

{

	background-color: #f4f4f4;

	width: 100%;

	margin: 0em;

}

.csharpcode .lnum { color: #606060; }

但.Net也提供了定义好的委托，我们可以直接使用。

二、定义

System.Action 无返回值

Action:

public delegate void Action ();
Action< T >:

public delegate void Action< T > (T obj);
Action< T1, T2 >：

public delegate void Action< T1, T2 > (T1 arg1, T2 arg2);

* delegate void Action<T1,T2,T3,T4>T1 arg1, T2 arg2, T3 arg3, T4 arg4);

System.Func 有返回值

Func< TResult >

public delegate TResult Func< TResult > ();
Func< T,TResult >

public delegate TResult Func< T, TResult > (T arg);
Func< T1,T2,TResult >

public delegate TResult Func< T1, T2, TResult > (T1 arg1, T2 arg2);

*delegate TResult Func<T1,T2,T3,T4,TResult>T1 arg1, T2 arg2, T3 arg3, T4 arg4);

三、使用

例子1：Action

using UnityEngine;

using System.Collections;

using System;

public class ActionTest : MonoBehaviour {

    void Start () {

        Action action = XXX;

        action();

    }

    void XXX()

    {

        Debug.Log("100");

    }

}

例子2：Action<T>

using UnityEngine;

using System.Collections;

using System;

public class ActionTest : MonoBehaviour {

    void Start () {

        Action<string> action = XXX;

        action("unity C#");

    }

    void XXX(string name)

    {

        Debug.Log(name);

    }

}

例子3：Action<T1,T2>

using UnityEngine;

using System.Collections;

using System;

public class ActionTest : MonoBehaviour {

    void Start () {

        Action<string,int> action = XXX;

        action("unity C#",100);

    }

    void XXX(string name,int score)

    {

        Debug.Log(string.Format("{0}  {1}",name,score);

    }

}

#region Action的用法

    ///Action<T>的用法

    ///这里的T为代理函数的传入类型,无返回值

    Action<string[]> action = delegate(string[] x)

    {

        var result = from p in x

                     where p.Contains("s")

                     select p;

        foreach (string s in result.ToList())

        {

            Console.WriteLine(s);

        }

    };

    string[] str={ "charlies","nancy","alex","jimmy","selina"};

    action(str);

    Console.ReadKey();

#endregion

上面的例子是通过传入的String类型的数组，找出其中包含有字符s的项，然后输出到控制台。

例子4：Func<TResult >

using UnityEngine;

using System.Collections;

using System;

public class FuncTest : MonoBehaviour {

    void Start () {

        Func< int > func= XXX;

       Debug.Log( func() );

    }

    int XXX()

    {

        return 10;

    }

}

例子5： Func<T,TResult>

using UnityEngine;

using System;
public Class FuncTest:MonoBehaviour{

   void Start(){

       Func<string ,int> func= CallStringLength;

     }
int CallStringLength(string str){

         return str.Lenth;

     }
}

Func<string> func=delegate(){

    return "我是Func<TResult>委托返回的结果";

}

Predicate只能接受一个传入参数，返回值为bool类型

#region Predicate

  ///bool Predicate<T>的用法

    ///输入一个T类型的参数,返回值为bool类型

    Predicate<string[]> predicate = delegate(string[] x)

    {

        var result = from p in x

                     where p.Contains("s")

                     select p;

        if (result.ToList().Count > 0)

        {

            return true;

        }

        else

        {

            return false;

        }

    };

    string[] _value = { "charlies", "nancy", "alex", "jimmy", "selina" };

    if (predicate(_value))

    {

        Console.WriteLine("They contain.");

    }

    else

    {

        Console.WriteLine("They don‘t contain.");

    }

    Console.ReadKey();

#endregion

上面的代码其实也是判断String数组中有没有包含s的项，有的话就在控制台打印出  They contain.没有的话就打印出They don‘t contain

//定义

    public void CallUI<T>(Action<T, object[]> callback, params object[] args) where T : CUIBase

//调用

    CUIManager.Instance.CallUI<CUIMidMsg>(

            (_ui, _arg) => _ui.ShowMsg((string)_arg[0]),

            string.Format(szMsg, format));

部分参考自：风宇冲Unity3D教程学院

时间： 2025-01-05 01:08:26

[C#] 委托Action和Func

一、说明

二、定义

三、使用

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