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try
{
FileInfo file = new FileInfo(Server.MapPath(@"ÕâÀïÃæÊÇÄãµÄÎļþÏà¶Ô·¾¶,±ÈÈçÄãµÄÎļþ½Ð1.jpg ÄÇôÄã¾ÍдÈëÕâ¸öµÄÏà¶Ô·¾¶"));

Response.Clear(); //Çå¿ÕÎļþÁ÷
Response.ClearContent();//Çå³ýÎļþÁ÷ÖÐËùÓÐÄÜÈÝ
Response.ClearHeaders();//Çå³ýÎļþÁ÷ÖеÄËùÓÐÍ·

string urlName = HttpUtility.UrlEncode("ÕâÀïÊÇÄãÒªÏÂÔØµÄÎļþµÄÃû×Ö", System.Text.Encoding.UTF8);
Response.AddHeader("Content-Disposition", "attachment;filename=" + urlName);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";


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