发表于 2009-1-5 19:48
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C#涓璂elegate娴呮瀽涓庢濊
鍙戝竷: 2008-6-30 10:13 | 浣滆: admin | 鏌ョ湅: 11娆
1. 浠涔堟槸鎵樼鍑芥暟
鎵樼鍑芥暟鏄竴涓绫婚噷闈㈢殑鏌愪釜鍑芥暟鐨勪竴涓紩鐢.瀹冭嚜宸卞苟娌℃湁鍏蜂綋鐨勫嚱鏁板畾涔,鍙槸鎸囧悜鏌愪釜鍑芥暟瀹炵幇.
2. 涓嶤++, Delphi鐨勬í鍚戞瘮杈
鍦–++鍜孌elphi涓笌鎵樼鍑芥暟瀵瑰簲鐨勭被鍨嬫槸鍑芥暟鎸囬拡,褰㈠紡濡備笅:
C++
typedef (int GetNum)(real rNum);
Delphi
function GetNum(rNum:real): integer; external;
杩欓噷瀹氫箟鍑芥暟鎸囬拡,浠栦滑鎵鑳芥寚鍚戠殑鍑芥暟瀹氫箟鐨勪紶鍏ュ弬鏁板繀椤绘槸瀹炲瀷,浼犲嚭涓烘暣褰
3. 鎵樼鍑芥暟鏈変粈涔堢敤
鐢变簬鎵樼鍑芥暟鏄绫婚噷闈㈡煇涓嚱鏁扮殑涓涓紩鐢.鎵浠ユ垜浠笉蹇呯煡閬撹繖涓嚱鏁扮殑鍏蜂綋鍚嶅瓧鏄粈涔,鑰屽彧闇瑕佽皟鐢ㄦ墭绠″嚱鏁,璁╂墭绠″嚱鏁板幓璋冪敤鐩稿簲鐨勫嚱鏁板氨鍙互浜. 涓涓緥瀛: 涓涓叕鍙,涓涓瀵,涓涓瀵肩涔,涓変釜鍛樺伐鍒嗗埆绠＄悊甯傚満,绛栧垝鍜岀敓浜.杩欓噷绉樹功灏辩浉褰撲笌涓涓墭绠″嚱鏁, 棰嗗瑕佷笅杈句粈涔堝懡浠(鑾峰緱甯傚満淇℃伅,鐢熶骇浠涔堜骇鍝),鍙渶瑕佸绉樹功璇寸粰鎴戜竴浠藉競鍦烘姤鍛婃垨鑰呮垜浠笉鐢熶骇鍘熷瓙寮硅浆鍚戠敓浜ф阿寮.鐒跺悗鍐嶇敱绉樹功鏍规嵁棰嗗鐨勫懡浠ら夋嫨鐨勫幓鎵惧摢涓憳宸,鍐嶆妸鍛樺伐鑾峰緱鐨勪俊鎭繑鍥炵粰棰嗗. 杩欓噷闈笁涓憳宸ュ浜庨瀵兼槸閫忔槑鐨,棰嗗骞朵笉鐭ラ亾鑷繁涓嬭揪鐨勫懡浠ゅ叿浣撴槸鐢辫皝鎵ц鐨.
4. 濡備綍瀹氫箟&&濡備綍浣跨敤
鎺ョ潃涓婇潰鐨勪緥瀛,鎴戜滑澹版槑涓涓涔︽墭绠″嚱鏁板師鍨
class Secretory
{
//瀹氫箟鎵樼鍑芥暟鍘熷瀷
private delegate string Do(string command);
//鍒涘缓鎵樼鍑芥暟瀹炰緥
public Do Doit;
//缁欑涔︿笅杈惧懡浠ゆ墽琛
public void ExecuteCommand(string command)
{
switch(绉樹功鏍规嵁鍛戒护鍒ゆ柇鏄缁欒皝鎵ц鐨)
{
case 璋冪爺甯傚満鐨勪汉:
Doit=new Do(new MarketMan().GetMarketInfo);
Break;
Case 鐢熼暱浜у搧鐨勪汉:
Doit=new Do(new ProductMan().ProduceProduct);
Break;
Default:
Break;
}
}
Doit(command);
}
///璋冪爺甯傚満鐨勯偅涓汉鐨勭被
class MarketMan
{
public string GetMarketInfo(string command)
{ 鏍规嵁鍛戒护璋冩煡淇℃伅, 杩斿洖鑾峰緱淇℃伅 ;}
}
///鐢熶骇浜у搧鐨勪汉
class ProductMan
{
public static string ProduceProduct(string command)
{ 鏍规嵁鍛戒护鐢熶骇浜у搧,骞惰繑鍥炵敓浜у伐绋嬩腑鐨勪俊鎭;}
}
ok,閭ｄ箞濡備綍鎵ц鍛?鑰佹澘鎬庝箞浣跨敤Secretory杩欎釜绫诲憿?
go on
鑰佹澘鍙渶瑕佹妸绉樹功鍙(new)杩囨潵,鐩存帴鍚戜粬涓嬭揪鍛戒护,鐒跺悗灏卞彲浠ュ枬鑼跺幓浜唦 ^_^
class Boss
{
public void static main()
{
(new Secretory()).Doit(鈥滄垜浠鐢熶骇姘㈠脊,鎶婁互鍓嶇殑鍘熷瓙寮归兘鎵斿埌鏃ユ湰濂戒簡鈥);
}
}
5. 鍏朵粬
姝ｅ叆浣犱滑鎵瑙佺殑,涓婇潰鐨勪袱涓被涓殑鏂规硶,涓涓槸闈欐,涓涓笉鏄潤鎬佺殑. 鎵樼鍑芥暟鎵鎸囩殑鍑芥暟鍙互闈欐佺殑涔熷彲浠ヤ笉鏄潤鎬佺殑.
