string與stringBuilder的效能區別)

自己動手測試了，效能差距還比較大：

Console.WriteLine("Class String:");string strClass = string.Empty;DateTime BeginTime = System.DateTime.Now;Console.WriteLine(BeginTime.ToString());for (int i = 0; i <= 99999; i++){    strClass += i.ToString();}DateTime EndTime = System.DateTime.Now;Console.WriteLine(EndTime.ToString());TimeSpan ts = EndTime.Subtract(BeginTime);Console.WriteLine("class string cost time is:" + ts.TotalMilliseconds.ToString() + "ms");Console.WriteLine(); Console.WriteLine("Class StringBulid:");StringBuilder sb = new StringBuilder();Console.WriteLine(System.DateTime.Now.ToString());BeginTime = System.DateTime.Now;for (int i = 0; i <= 99999; i++){    sb.Append(i.ToString());}Console.WriteLine(System.DateTime.Now.ToString());EndTime = System.DateTime.Now;ts = EndTime.Subtract(BeginTime);Console.WriteLine("class stringbuild cost time is:" + ts.TotalMilliseconds.ToString() + "ms");

結果：

Class String:

2008-12-24 13:33:29

2008-12-24 13:34:29

class string cost time is:60453.125ms

Class StringBulid:

2008-12-24 13:34:29

2008-12-24 13:34:29

class stringbuild cost time is:31.25ms

請按任意鍵繼續. . .