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; //使用委托但.Net也提供了定义好的委托,我们可以直接使用。二、定义Syst ...
一、说明
一般我们定义委托都是有如下两步:
public delegate void MyDelegate(get='_blank'>string name);//定义委托
public MyDelegate myDelegate; //使用委托
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
原标题:委托之Action和Func区别
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