写了个以文件流方式从服务器获取数据并保存到本地的方法有问题请帮忙看看

[l890j817]

下面是代码，下载下来的文件固定占用大小8K，内容大小7.14K，小于这个仍然是那么多不过小于这个大小的文件可用。能看出是什么问题吗？

private void DownLoad()
{
/*读取数据库文件流，保存到本地*/
int id;
byte[] file;//二进制数据
string fileName;//目标文件

if (int.TryParse(this.Request.QueryString["Id"], out id))
{
MyDocument document = this.documentService.GetDocument(id);
if (document != null)
{
fileName = document.FileName;
file = document.FileContent;

//MemoryStream stream = new MemoryStream(file);

FileStream fs_stream = new FileStream(fileName, FileMode.OpenOrCreate);

Response.ContentType = "application/octet-stream";

Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));

BinaryWriter writefile = new BinaryWriter(fs_stream);

writefile.Write(file);

writefile.Close();
}
}
}

[堆代码的爱因斯坦]

private   void   FileDownload() 
        { 
                String   FullFileName   =   Server.MapPath( "文件路径 "); 
                FileInfo   DownloadFile   =   new   FileInfo(FullFileName); 
                Response.Clear(); 
                Response.ClearHeaders(); 
                Response.Buffer   =   false; 
                Response.ContentType   =   "application/octet-stream "; 
                Response.AppendHeader( "Content-Disposition ",   "attachment;filename= "   +   HttpUtility.UrlEncode(DownloadFile.FullName,   System.Text.Encoding.UTF8)); 
                Response.AppendHeader( "Content-Length ",   DownloadFile.Length.ToString()); 
                Response.WriteFile(DownloadFile.FullName); 
                Response.Flush(); 
                Response.End(); 
        } 

[l890j817]

1L抱歉忘了说了我服务器存取用的IBatis，读取名为FileContent列中对应Id保存的byte[]。
所以String FullFileName = Server.MapPath（“文件路径”），这个文件路径我该怎么指定啊？求解

[Quote=引用 1 楼 jayinit 的回复:]
C# code
private void FileDownload()
{
String FullFileName = Server.MapPath( "文件路径 ");
FileInfo DownloadFile = new FileInfo(FullFileName……
[/Quote]

[l890j817]

已解决，原来是使用了
FileStream fs_stream = new FileStream(fileName, FileMode.OpenOrCreate);

BinaryWriter writefile = new BinaryWriter(fs_stream);

writefile.Write(file);

这样这个流的大小始终为页面大小。去掉后正常。