检查 URL 是否有效 -404/未找到

Question

我正在使用以下方法来检查一个 URL 是否存在或是否有效。

class MyClient : WebClient
{
    public bool HeadOnly { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest req = base.GetWebRequest(address);

        if (HeadOnly && req.Method == "GET")
        {
            req.Method = "HEAD";
        }
        return req;
    }
}

private static Boolean CheckURL(string url)
{
    using (MyClient myclient = new MyClient())
    {
        try
        {
            myclient.HeadOnly = true;
            // fine, no content downloaded
            string s1 = myclient.DownloadString(url);
            return true;
        }
        catch (Exception error)
        {
            return false;
        }
    }
}

我的方法正确吗？如何向用户显示已检查 URL 的状态，例如：404、成功等？

请指教..

Answer 1

这是你的答案。

public static void isURLExist(string url)
    {
        try
        {
            WebRequest req = WebRequest.Create(url);

            WebResponse res = req.GetResponse();

            Console.WriteLine("Url Exists");
        }
        catch (WebException ex)
        {
            Console.WriteLine(ex.Message);
            if (ex.Message.Contains("remote name could not be resolved"))
            {
                Console.WriteLine("Url is Invalid");
            }
        }
    }