C# ASPX.NET 文件（图片）下载

最好使用aspx页面写：

 1 protected void Page_Load(object sender,EventArgs e)

 2 {

 3      if(!IsPostBack)

 4     {

 5         System.Io.FileStream myFileStream = new System.Io.FileStream(Server.MapPath("",System.Io.FileMode.Open));

 6         long FileSize;

 7         FileSize = myFileStream.Length;

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

 9         myFileStream.Read(Buffer,0,(int)myFileStream.Length);

10         myFileStream.Close();

11 

12         Response.Clear();

13         Response.ClearHeaders();

14         Response.Content();

15         Response.ContentType = "image/png";

16         Response.AddHeader("content-disposition","attachment:filename="+"文件名.png",System.Text.Encoding.UTF8)

17         Response.BinaryWrite(Buffer );

18     }  

19 }