c# - 发布数据后如何读取 WebClient 响应？

Question

看代码：

using (var client = new WebClient())
{
    using (var stream = client.OpenWrite("http://localhost/", "POST"))
    {
        stream.Write(post, 0, post.Length);
    }
}

现在，我如何读取 HTTP 输出？

Answer 1

看起来您有一些byte[]数据要发布；在这种情况下，我希望您会发现它更易于使用：

byte[] response = client.UploadData(address, post);

如果响应是文本，例如：

string s = client.Encoding.GetString(response);

（或您的选择Encoding- 也许Encoding.UTF8）

Answer 2

如果您想在任何地方保留流并避免分配大量字节数组，这是一种很好的做法（例如，如果您打算发布大文件），您仍然可以使用 WebClient 的派生版本来做到这一点。这是一个示例代码。

using (var client = new WebClientWithResponse())
{
    using (var stream = client.OpenWrite(myUrl))
    {
        // open a huge local file and send it
        using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
        {
            file.CopyTo(stream);
        }
    }

    // get response as an array of bytes. You'll need some encoding to convert to string, etc.
    var bytes = client.Response;
}

这是定制的WebClient：

public class WebClientWithResponse : WebClient
{
    // we will store the response here. We could store it elsewhere if needed.
    // This presumes the response is not a huge array...
    public byte[] Response { get; private set; }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        var response = base.GetWebResponse(request);
        var httpResponse = response as HttpWebResponse;
        if (httpResponse != null)
        {
            using (var stream = httpResponse.GetResponseStream())
            {
                using (var ms = new MemoryStream())
                {
                    stream.CopyTo(ms);
                    Response = ms.ToArray();
                }
            }
        }
        return response;
    }
}