Asp.net直接保存文件到客户端

在我们的系统的编写过程中,应该有很多的时候需要客户下载文件.我第一次的做法(应该也是大部分人的做法吧?)是:

HttpResponse response = HttpContext.Current.Response;

string js = "<script language=javascript>window.open('{0}');</script>";

js = string.Format(js, url);

response.Write(js);

但是有个问题了,就是会被广告拦截软件直接拦截掉,另我非常的头痛,于是寻找更好的解决方法.看了用Response.BinaryWrite写文件流一文之后觉得确实可以如此,修改代码如下:

/// <summary>

/// 下载文件

/// </summary>

/// <param name="filename">文件物理地址</param>

protected void DownloadFile(string filename)

{

string saveFileName = "test.xls";

int intStart = filename.LastIndexOf("")+1;

saveFileName = filename.Substring(intStart,filename.Length-intStart);

FileStream MyFileStream;

long FileSize;

MyFileStream = new FileStream(filename,FileMode.Open);

FileSize = MyFileStream.Length;

byte[] Buffer = new byte[(int)FileSize];

MyFileStream.Read(Buffer, 0, (int)FileSize);

MyFileStream.Close();

Response.AddHeader("Content-Disposition", "attachment;filename="+saveFileName);

Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

Response.ContentType = "application/vnd.ms-excel";

Response.BinaryWrite(Buffer);

Response.Flush();

Response.Close();

Response.End();

}

但是有个严重的问题，就是文件格式。这样只是将流输出，且无法正确识别格式。还好，能人层出不穷，柚子Nan 提出了能否不考虑文件的类型，直接把文件显示到浏览器(Response) 的想法正好切中我的要害所在，于是急忙研究了柚子Nan的想法，修改出最后代码：

/// <summary>

/// 下载文件

/// </summary>

/// <param name="filename">文件物理地址</param>

protected void DownloadFile(string filename)

{

string saveFileName = "test.xls";

int intStart = filename.LastIndexOf("")+1;

saveFileName = filename.Substring(intStart,filename.Length-intStart);

Response.Clear();

Response.Charset = "utf-8";

Response.Buffer= true;

this.EnableViewState = false;

Response.ContentEncoding = System.Text.Encoding.UTF8;

Response.AppendHeader("Content-Disposition","attachment;filename=" + saveFileName);

Response.WriteFile(filename);

Response.Flush();

Response.Close();

Response.End();

}

文件的ContentType类型小全

...

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