c# webclient 使用默认代理的代码

void Main()
{
    using (WebClient client = new WebClient())
    {
        // 使用默认代理
        client.Proxy = WebRequest.GetSystemWebProxy();


        
        // 你可以选择是否设置凭据
        client.Credentials = CredentialCache.DefaultNetworkCredentials;

        try
        {
            // 下载文件
            string url = "https://google.com"; // 替换为实际URL

            var html = client.DownloadString(url);
            html.Dump();
        }
        catch (Exception ex)
        {
            Console.WriteLine("An error occurred: " + ex.Message);
        }
    }
}