C# 中的 System.Net Web 客户端无法连接到服务器

发布于 2024-07-11 18:55:28 字数 1282 浏览 10 评论 0原文

我需要做些什么才能让 System.Net 与 Microsoft Visual C# 2008 Express Edition 一起使用吗？我似乎根本无法让任何 Web 类型控件或类工作。下面的 WebClient 示例总是抛出异常“无法连接到远程服务器”。因此我可以'也无法让 WebBrowser 控件加载页面。

这是代码（已编辑）：

using System;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            using (WebClient client = new WebClient()) {
                string s = client.DownloadString("http://www.google.com");
                this.textBox1.Text = s;
            }
        }
    }
}

这是一个简单的形式，其中只有一个文本框控件（多行设置为 true）。 DownloadString(...) 行引发异常。我也尝试使用 WebRequest.. 同样的异常！

编辑：

我已连接到 Linksys WRT54G 路由器，该路由器直接连接到我的电缆调制解调器。我不在代理服务器后面，尽管我运行了 proxycfg -u 并且得到：

Updated proxy settings
Current WinHTTP proxy settings under:
  HKEY_LOCAL_MACHINE\
    SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\
      WinHttpSettings :

 Direct access (no proxy server).

我正在使用 Windows XP 并且没有运行任何类型的防火墙。目前只有AVG。我很确定我不需要转发任何端口或任何东西，但我确实尝试将端口 80 转发到路由器上的工作站。没有帮助。

原文

Is there something I need to do to get System.Net working with Microsoft Visual C# 2008 Express Edition? I can't seem to get any web type controls or classes to work at all.. the below WebClient example always throws the exception "Unable to connect to the remote server".. and consequently I can't get the WebBrowser control to load a page either.

Here is the code (Edited):

using System;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            using (WebClient client = new WebClient()) {
                string s = client.DownloadString("http://www.google.com");
                this.textBox1.Text = s;
            }
        }
    }
}

This is in a simple form with only a textbox control (with multiline set to true) in it. The exception gets thrown on the DownloadString(...) line. I also tried using WebRequest.. same exception!

EDIT:

I am connected to a Linksys WRT54G Router that connects directly to my cable modem. I am not behind a proxy server, although I did run proxycfg -u and I got:

Updated proxy settings
Current WinHTTP proxy settings under:
  HKEY_LOCAL_MACHINE\
    SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\
      WinHttpSettings :

 Direct access (no proxy server).

I am using Windows XP and not running any kind of firewall. Only AVG at the moment. I'm pretty sure I shouldn't have to forward any ports or anything, but I did try forwarding port 80 to my workstation on my router. Didn't help.

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花间憩 2024-07-18 18:55:28

（更新 - 我的意思是 proxycfg，而不是 httpcfg；proxycfg -u 将执行导入）

首先，有这里的“express”没什么特别的。其次，contoso 是一个虚拟 URL。

你使用什么操作系统？您是否通过代理服务器？如果是这样，您可能需要配置操作系统的 http 堆栈 - proxycfg 将在 XP 上完成这项工作，并且可用于导入用户的 IE 设置。

该示例很好，尽管它没有正确处理多个 IDisposable 对象 - 以下要简单得多：

        using (WebClient client = new WebClient()) {
            string s = client.DownloadString("http://www.google.com");
            // do something with s
        }

(update - I meant proxycfg, not httpcfg; proxycfg -u will do the import)

First, there is nothing special about "express" here. Second, contoso is a dummy url.

What OS are you on? And do you go through a proxy server? If so, you might need to configure the OS's http stack - proxycfg will do the job on XP, and can be used to import the user's IE settings.

The sample is fine, although it doesn't correctly handle the multiple IDisposable objects - the following is much simpler:

        using (WebClient client = new WebClient()) {
            string s = client.DownloadString("http://www.google.com");
            // do something with s
        }

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