C#如何使用响应状态码创建WebException

using System;
using System.Net;

class Program
{
    static void Main()
    {
        try
        {
            // 创建一个HttpWebRequest对象
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com");

            // 发送请求并获取响应
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            // 获取响应的状态码
            HttpStatusCode statusCode = response.StatusCode;

            // 如果状态码不是200（OK），则抛出WebException
            if (statusCode != HttpStatusCode.OK)
            {
                throw new WebException("请求失败，状态码：" + statusCode.ToString(), null, WebExceptionStatus.ProtocolError, response);
            }

            // 处理正常响应
            // ...

            // 关闭响应
            response.Close();
        }
        catch (WebException ex)
        {
            // 处理WebException
            Console.WriteLine("发生WebException：" + ex.Message);
            if (ex.Response != null)
            {
                // 获取WebException的响应
                HttpWebResponse errorResponse = (HttpWebResponse)ex.Response;
                Console.WriteLine("错误响应的状态码：" + errorResponse.StatusCode);
                // ...
                errorResponse.Close();
            }
        }
        catch (Exception ex)
        {
            // 处理其他异常
            Console.WriteLine("发生异常：" + ex.Message);
        }
    }
}