C＃Web客户端和代理服务器 [英] C# webclient and proxy server

问题描述

我使用的是Web客户端类在我的源代码code使用HTTP下载的字符串。

这是工作的罚款。然而，在该公司的客户都现在连接到代理服务器。而从这个开始的问题。

当我测试了我的申请，我不认为它可以通过代理服务器，作为不断得到抛出的异常是不从xxx.xxx.xxx.xxx答复是代理服务器的IP地址。

不过，我仍然可以浏览到该网站的网址，并通过代理服务器连接时正确显示字符串中的浏览器，而不是当我用我的网络客户端。

有什么在Web客户端，我必须配置，让我从后面代理服务器访问URL？

 使用（Web客户端WC =新的WebClient（））
{
    字符串strURL =HTTP：// xxxxxxxxxxxxxxxxxxxxxxxx    //下载只有当Web客户端不旺。
    如果（！wc.IsBusy）
    {
        字符串rtn_msg =的String.Empty;
        尝试
        {
            rtn_msg = wc.DownloadString（新的URI（strURL））;
            返回rtn_msg;
        }
        赶上（引发WebException前）
        {
            Console.Write（ex.Message）;
            返回false;
        }
        赶上（异常前）
        {
            Console.Write（ex.Message）;
            返回false;
        }
    }
    其他
    {
        System.Windows.Forms.MessageBox.Show（忙，请重试）;
        返回false;
    }
}
 

解决方案

我的解决办法：

  Web客户端的客户端=新的WebClient（）;
WebProxy WP =新WebProxy（代理服务器地址在这里）;
client.Proxy =可湿性粉剂;
字符串str = client.DownloadString（http://www.google.com）;
 

I am using a web client class in my source code for downloading a string using http.

This was working fine. However, the clients in the company are all connected now to a proxy server. And the problem started from this.

When I have tested my application I don't think it can pass through the proxy server, as the exception that keeps getting thrown is "no response from xxx.xxx.xxx.xxx which is the proxy server IP address.

However, I can still navigate to the web site URL and it displays the string correctly in the browser when connecting through a proxy server, but not when I use my web client.

Is there something in the web client that I have to configure to allow me to access the url from behind a proxy server?

using (WebClient wc = new WebClient())
{
    string strURL = "http://xxxxxxxxxxxxxxxxxxxxxxxx";

    //Download only when the webclient is not busy.
    if (!wc.IsBusy)
    {
        string rtn_msg = string.Empty;
        try
        {
            rtn_msg = wc.DownloadString(new Uri(strURL));
            return rtn_msg;
        }
        catch (WebException ex)
        {
            Console.Write(ex.Message);
            return false;
        }
        catch (Exception ex)
        {
            Console.Write(ex.Message);
            return false;
        }
    }
    else
    {
        System.Windows.Forms.MessageBox.Show("Busy please try again");
        return false;
    }
}

解决方案

My solution:

WebClient client = new WebClient();
WebProxy wp = new WebProxy(" proxy server url here");
client.Proxy = wp;
string str = client.DownloadString("http://www.google.com");

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