Asp.net下载文件、文件流输出 直接输出文件

一下所写的代码都是在下载页面page_load事件中：

//直接输出文件形式

Response.Clear();
Response.Buffer = true;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Server.MapPath("~/Global.asax"),System.Text.Encoding.UTF8));
Response.WriteFile(Server.MapPath("~/Global.asax"));
Response.Flush();
Response.Close();

 

//输出文件流形式

FileStream fileStream = new FileStream(Server.MapPath("~/Global.asax"), FileMode.Open);

long fileSize = fileStream.Length;
byte[] fileBuffer = new byte[fileSize];
fileStream.Read(fileBuffer, 0, (int)fileSize);

//如果不写fileStream.Close()语句，用户在下载过程中选择取消，将不能再次下载
fileStream.Close();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Server.MapPath("~/Global.asax"), System.Text.Encoding.UTF8));
Response.AddHeader("Content-Length", fileSize.ToString());
Response.BinaryWrite(fileBuffer);
Response.Flush();
Response.Close();