HttpWebRequest返回状态为400错误请求时如何读取服务器响应

try
{
    // 创建HttpWebRequest对象并发送请求
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com");
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    // 获取状态码和状态描述
    HttpStatusCode statusCode = response.StatusCode;
    string statusDescription = response.StatusDescription;

    // 读取服务器返回的内容
    Stream responseStream = response.GetResponseStream();
    StreamReader reader = new StreamReader(responseStream);
    string responseText = reader.ReadToEnd();

    // 关闭流和响应对象
    reader.Close();
    responseStream.Close();
    response.Close();

    // 处理服务器响应
    // ...
}
catch (WebException ex)
{
    // 捕获WebException异常并处理
    if (ex.Response != null)
    {
        HttpWebResponse errorResponse = (HttpWebResponse)ex.Response;
        HttpStatusCode statusCode = errorResponse.StatusCode;
        string statusDescription = errorResponse.StatusDescription;

        // 读取服务器返回的错误信息
        Stream responseStream = errorResponse.GetResponseStream();
        StreamReader reader = new StreamReader(responseStream);
        string errorText = reader.ReadToEnd();

        // 关闭流和响应对象
        reader.Close();
        responseStream.Close();
        errorResponse.Close();

        // 处理错误信息
        // ...
    }
}