C#中判斷伺服器圖片是否存在

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     public int num = 0;
       /// <summary>      /// 判斷伺服器路徑中的圖片檔案是否存在存在則累加統計      /// </summary>    private int GetAcount(string name)     {        for (int i = 1; i < i + 1; i++)        {            string url = "http://IP/Image/" + name + "/" + name + i + ".jpg";            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));            ServicePointManager.Expect100Continue = false;            try            {                ((HttpWebResponse)request.GetResponse()).Close();            }            catch (WebException exception)            {                if (exception.Status != WebExceptionStatus.ProtocolError){                    num++;                }                if (exception.Message.IndexOf("500 ") > 0){                    Response.Write("<script>alert(‘伺服器內部錯誤，無法完成請求，請聯絡管理 員！‘);</script>");}                if (exception.Message.IndexOf("401 ") > 0){                    Response.Write("<script>alert(‘需要身份認證，你沒有許可權！‘);</script>");}                if (exception.Message.IndexOf("404")> 0){                    return num;                }            }            num++;        }        return num;    }

　　

C#中判斷伺服器圖片是否存在