.net做的文件下载，pc段没有问题，但是用安卓手机浏览器下载是提示下载失败，内部程序错误，请问什么问题？
代码如下：
try
{
if (!File.Exists(FilePath))
{
HttpContext.Current.Response.Write("不存在该文件");
HttpContext.Current.Response.End();
HttpContext.Current.Response.Close();
}
string sFileName = @"E:\NCLFile\BaseFilePath_InfoPub\InfoPub\2016-08\118128\2oa_chgrpt_新建会议系统.doc";
FileStream fileStream = new FileStream(sFileName, 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();
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8));
HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString());
HttpContext.Current.Response.AddHeader("Content-Type", "application/doc");
HttpContext.Current.Response.BinaryWrite(fileBuffer);
//HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
HttpContext.Current.Response.Close();
