C# 泛型約束 xxx Where T：約束(一)

泛型約束

代碼舉例

發現我們游戲的代碼中，主程寫了很多類似這樣的代碼：

public static T CreateObject<T>(out int objectId) where T : new() //方法名

//單例類
public class CSingleton<T> where T : new() 

//根據 url和Type 查找UI控件
public T GetControl<T>(string uri, Transform findTrans = null, bool isLog = true) where T : UnityEngine.Object 

public T FindControl<T>(string name) where T : Component

public void OpenWindow<T>(params object[] args) where T : CUIBase

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

//加載Tab表
public void LoadTab<T>(string tabPath) where T : CBaseInfo, new()

具體使用

定義：public T GetInfo<T>(string id) where T : CBaseInfo

使用：ActorInfo actorInfo = CGameSettings.Instance.GetInfo<ActorInfo>(actorId);

解釋：[T GetInfo(String id)]傳入一個 ID 返回一個Class ，[where T:CBaseInfo]約束這個Class的Type 必須 繼承之 CBaseInfo

插件也使用泛型寫法

當然項目中使用一些插件也是有類似的寫法

FingerGestures

public abstract class ContinuousGestureRecognizer<T> : GestureRecognizerTS<T> where T : ContinuousGesture, new()

public static T CreateAsset<T>() where T : ScriptableObject

public abstract class FingerEventDetector<T> : FingerEventDetector where T : FingerEvent, new()

NGUI

static public T[] FindActive<T> () where T : Component

static public T AddChild<T> (GameObject parent, bool undo) where T : Component

static public T Begin<T> (GameObject go, float duration) where T : UITweener

TK2D

public static T LoadResourceByName<T>(string guid) where T : UnityEngine.Object 

public static T AddComponent<T>(GameObject go, tk2dSpriteCollectionData spriteCollection, string spriteName) where T : tk2dBaseSprite