Delegate action and Func differences

I. Description

In general, we define a delegate in two steps as follows:

 Public Delegate void MyDelegate (string name); //define Delegates

 Public MyDelegate mydelegate; Using delegates

But. NET also provides a well-defined delegate that we can use directly.

Second, the definition

System.Action no return value

Action:publicdelegatevoid Action (); action< t;: Publicdelegatevoid action< T > (t obj); action< T1, T2;: Publicdelegatevoid action< T1, T2 > (T1 arg1, T2 arg2);

Delegate void Action<t1,t2,t3,t4>t1 arg1, T2 arg2, T3 arg3, T4 arg4);

System.Func has a return value

func< TResult >publicdelegate TResult func< TResult > (); func< t,tresult >publicdelegate TResult func< T, TResult > (T arg); func< t1,t2,tresult >publicdelegate 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);

Third, the use

Example 1:action

using Unityengine; using System.Collections; using System;  Public class actiontest:monobehaviour {    void Start () {        action action = XXX;        Action ();    }    void XXX ()    {        Debug.Log ("+");}    }

 example 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); }}

Example 3:action<t1,t2>using unityengine; using System.Collections; using System;  Public class actiontest:monobehaviour {    void Start () {        action<string,int> Action = xxx;< C10/>action ("Unity C #", +);    }    void XXX (string name,int score)    {        Debug.Log (string. Format ("{0}  {1}", Name,score);}    }

 #region  Action usage ///action<t>  ///here T is the incoming type of the proxy function, no return value  action<string  []> Action = Span class= "KWRD" >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" ,    span class= "str" > "Jimmy" ,  "Selina" };    Action (str); Console.readkey ();  #endregion  

The example above is an array of string types passed in to find the entry containing the character s, and then output to the console.

Example 4:func<tresult >using unityengine; using System.Collections; using System;  Public class functest:monobehaviour {    void Start () {        int > func= XXX;       Debug.Log (func ());    }    int XXX ()    {        return ten;    }}

Example 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' I am func<tresult> The result of the delegate return ";}

predicate can only accept one incoming parameter, the return value is type bool

#regionpredicatethe usage of///bool predicate<t>    /// input a parameter of type T, the return value is type boolpredicate<string[]> predicate =Delegate(string[] x) {var result = from PinchXwhereP.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

The above code is also to determine whether the string array contains s of the item, and some words in the console print out they contain. If not, print out the They don ' t contain

//Definition     Public void Object params Object where T:cuibase//Call    cuimanager.instance.callui<cuimidmsg> (            (_ui, _arg) = _ui. ShowMsg (string) _arg[0]),            string. Format (szmsg, format));

Part of the reference from: Wind Yu Chong Unity3d Tutorial Academy

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Delegate action and Func differences