WebClient.UploadFile失败,"请求已中止:请求已取消."

Question

我正在尝试使用WebClient.UploadFile将文件上传到HTTP URL .对于1M,2M等小文件,上传成功.但是对于像12M这样的大文件,我得到了这个例外:

The request was aborted: The request was canceled.

有没有人以前遇到过这个问题,你能分享一下解决方案吗？

一些信息:

• 服务器正在使用ASP.NET 3.5.
• 我上传时使用的HTTP方法是"PUT".

Answer 1

这是smwikipedia的答案中提到的解决方案.我添加了禁用写入流缓冲的功能,这可以帮助解决内存不足异常问题.

public class ExtendedWebClient : WebClient
{
    public int Timeout { get; set; }
    public new bool AllowWriteStreamBuffering { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address);
        if (request != null)
        {
            request.Timeout = Timeout;
            var httpRequest = request as HttpWebRequest;
            if (httpRequest != null)
            {
                httpRequest.AllowWriteStreamBuffering = AllowWriteStreamBuffering;
            }
        }
        return request;
    }

    public ExtendedWebClient()
    {
        Timeout = 100000; // the standard HTTP Request Timeout default
    }
}

用法:

var webClient = new ExtendedWebClient();
webClient.Timeout = Timeout.Infinite;
webClient.AllowWriteStreamBuffering = false;
webClient.UploadFile(url, filePath);