c# - 从 url 下载 .xls 文件

Question

我正在尝试从 url 下载 xls 文件: http://www.site.com/ff/excel/file.aspx?deven=0

我正在使用此代码，但下载完成后文件未正确下载。如何正确下载此文件？

string remoteFilename="http://www.site.com/ff/excel/file.aspx?deven=0";
string localFilename = "D:\\1\\1.xls";
Stream remoteStream = null;
Stream localStream = null;
WebResponse response = null;

try
{
    // Create a request for the specified remote file name
    WebRequest request = WebRequest.Create(remoteFilename);
    if (request != null)
    {
        // Send the request to the server and retrieve the
        // WebResponse object 
        response = request.GetResponse();
        response.ContentType = "application/vnd.ms-excel";

        if (response != null)
        {
            // Once the WebResponse object has been retrieved,
            // get the stream object associated with the response's data
            remoteStream = response.GetResponseStream();

            // Create the local file
            localStream = File.Create(localFilename);

            // Allocate a 1k buffer
            byte[] buffer = new byte[1024];
            int bytesRead;

            // Simple do/while loop to read from stream until
            // no bytes are returned
            do
            {
                // Read data (up to 1k) from the stream
                bytesRead = remoteStream.Read(buffer, 0, buffer.Length);

                // Write the data to the local file
                localStream.Write(buffer, 0, bytesRead);

                // Increment total bytes processed

            } while (bytesRead > 0);
        }
    }
}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    // Close the response and streams objects here 
    // to make sure they're closed even if an exception
    // is thrown at some point
    if (response != null) response.Close();
    if (remoteStream != null) remoteStream.Close();
    if (localStream != null) localStream.Close();
}
MessageBox.Show("file downl");

Answer 1

使用WebClient ，就简单多了:

using (WebClient webClient = new WebClient())
{
    webClient.DownloadFile(remoteFileName, localFilename);
}

if(File.Exists(localFilename))
    MessageBox.Show("File Downloaded");