核心代码：
DataSet ds = dBll.GetList("ID=" + ID); |
string docName = "a.doc";//文件名， |
byte[] file = (byte[])ds.Tables[0].Rows[0]["FContent"]; // "FContent"类型为image string Type = checktype(docName); Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(docName, System.Text.Encoding.UTF8).Replace("+", "%20")); Response.AddHeader("Content-Length ", file.Length.ToString()); Response.ContentType = Type; Response.BinaryWrite(file);//可以下载二进制文件，如数据库存的image //Response.WriteFile(fliePath);可以下载路径文件 Response.End(); Response.Clear();/// <summary>/// 根据文件的扩展名来获取对应的“输出流的HTTP MIME“类型/// </summary>/// <param name="filename"></param>/// <returns></returns>private string checktype(string filename){ string ContentType; switch (filename.Substring(filename.LastIndexOf(".")).Trim().ToLower()) { case ".asf ": ContentType = "video/x-ms-asf "; break; case ".avi ": ContentType = "video/avi "; break; case ".doc ": ContentType = "application/msword "; break; case ".zip ": ContentType = "application/zip "; break; case ".xls ": ContentType = "application/vnd.ms-excel "; break; case ".gif ": ContentType = "image/gif "; break; case ".jpg ": ContentType = "image/jpeg "; break; case "jpeg ": ContentType = "image/jpeg "; break; case ".wav ": ContentType = "audio/wav "; break; case ".mp3 ": ContentType = "audio/mpeg3 "; break; case ".mpg ": ContentType = "video/mpeg "; break; case ".mepg ": ContentType = "video/mpeg "; break; case ".rtf ": ContentType = "application/rtf "; break; case ".html ": ContentType = "text/html "; break; case ".htm ": ContentType = "text/html "; break; case ".txt ": ContentType = "text/plain "; break; default: ContentType = "application/octet-stream "; break; } return ContentType;} |
HttpUtility.UrlEncode(docName, System.Text.Encoding.UTF8).Replace("+", "%20"));这个可以解决中文文件名中包含空格的问题，UrlEncode编码后会把文件名中的空格转换中+（+转换为%2b），但是浏览器是不能理 解加号为空格的，所以在浏览器下载得到的文件，空格就变成了加号；
解决办法：UrlEncode 之后, 将 “+” 替换成 “%20″，因为浏览器将%20转换为空格