ASP.Net中文件下载的两种方法

/// <summary>
/// 文件下载
/// </summary>
/// <param name="localurl">本地路径</param>
/// <param name="fileurl">需要下载文件的路径</param>
public static void DownLoadFile(string localurl, string fileurl)
{
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(fileurl);
FileStream fs = null;
Stream responseStream = null;
try
{
//向服务器请求，获得服务器回应数据流
responseStream = request.GetResponse().GetResponseStream();
//判断本地文件是否存在，如果存在，则打开和重写本地文件
if (File.Exists(localurl))
{
// fs = File.Open(FileName, FileMode.Open, FileAccess.ReadWrite);
return;
}
//判断本地文件是否存在，如果不存在，则创建本地文件
else
{
fs = File.Create(localurl);
//ltrInfo.Text = FileName;
}
if (fs != null)
{
int buffer_count = 65536;
byte[] buffer = new byte[buffer_count];
int size = 0;
while ((size = responseStream.Read(buffer, 0, buffer_count)) > 0)
{
fs.Write(buffer, 0, size);
}
fs.Flush();
fs.Close();
responseStream.Close();
}
}
catch (Exception ex)
{

}
finally
{
//Response.Write(response.StatusDescription);
if (fs != null)
fs.Close();
if (responseStream != null)
responseStream.Close();
}
}

HttpResponse resp = System.Web.HttpContext.Current.Response;
FileInfo DownloadFile = new FileInfo(path);
resp.Clear();
resp.ClearHeaders();
resp.Buffer = false;
resp.ContentType = "application/octet-stream";
resp.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
resp.AppendHeader("Content-Length", DownloadFile.Length.ToString());
resp.WriteFile(DownloadFile.FullName);
resp.Flush();
resp.End();