我有一段非常简单的代码。一切都写得正确，没有错别字，我和同事聊天，但我们俩根本不知道错误在哪里。
它顺利通过直到出现异常的 GetRequestStream() 。它找到文件，对其进行正确编码，但似乎无法与服务器连接。
这是代码：
public class WebRequestUploadExample
{
public void WebRequestUpload()
{
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(@"ftp://xxxxx");
request.Method = WebRequestMethods.Ftp.UploadFile;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential("xxxxx", "xxxxx");
// Copy the contents of the file to the request stream.
StreamReader sourceStream = new StreamReader(@"D:\ftpTest\Test\Test.txt");
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);
response.Close();
}
}