CODEWITHSUNDEEP
c#proxyregistry
John Miller
John Miller

Reputation: 1009

Programmatically Set Browser Proxy Settings in C#

I'm writing an winforms app that needs to set internet explorer's proxy settings and then open a new browser window. At the moment, I'm applying the proxy settings by going into the registry:

RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
registry.SetValue("ProxyEnable", 1);
registry.SetValue("ProxyServer", "127.0.0.1:8080");

Is going into the registry the best way to do this, or is there a more recommended approach? I'd like to avoid registry changes if there's an alternative solution.

Upvotes: 37

Views: 75250

Answers (6)

131
131

Reputation: 3361

I wrote a 10 lines program to do that, feel free to try https://github.com/131/proxytoggle

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32;

namespace ProxyToggle
{

    class Program
    {

        [DllImport("wininet.dll")]
        public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
        public const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
        public const int INTERNET_OPTION_REFRESH = 37;


        static void setProxy(string proxyhost, bool proxyEnabled)
        {
            const string userRoot = "HKEY_CURRENT_USER";
            const string subkey = "Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
            const string keyName = userRoot + "\\" + subkey;

            if(proxyhost.Length != 0)
               Registry.SetValue(keyName, "ProxyServer", proxyhost);
            Registry.SetValue(keyName, "ProxyEnable", proxyEnabled ? "1" : "0", RegistryValueKind.DWord);

            // These lines implement the Interface in the beginning of program 
            // They cause the OS to refresh the settings, causing IP to realy update
            InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
            InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
        }

        static void Main(string[] args)
        {
            if (args.Length == 0)
            {
                setProxy("", false);
                return;
            }

            setProxy(args[0], true);
        }
    }
}

Upvotes: 14

Naim Raja Díaz
Naim Raja Díaz

Reputation: 111

You can use this useful method existing since FW 2.0: (i've just discovered and i'm another man now...)

http://msdn.microsoft.com/en-us/library/system.net.webrequest.getsystemwebproxy.aspx

Upvotes: 3

Dave
Dave

Reputation: 12467

Quick Code example (from msdn):

WebProxy proxyObject = new WebProxy("http://proxyserver:80/",true);
WebRequest req = WebRequest.Create("http://www.contoso.com");
req.Proxy = proxyObject;

Upvotes: -2

chris
chris

Reputation: 241

from: http://social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/19517edf-8348-438a-a3da-5fbe7a46b61a

Add these lines at the beginning of your code:

using System.Runtime.InteropServices; using Microsoft.Win32;

    [DllImport("wininet.dll")]
    public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
    public const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
    public const int INTERNET_OPTION_REFRESH = 37;
    bool settingsReturn, refreshReturn;

And imply the code:

        RegKey.SetValue("ProxyServer", YOURPROXY);
        RegKey.SetValue("ProxyEnable", 1);

        // These lines implement the Interface in the beginning of program 
        // They cause the OS to refresh the settings, causing IP to realy update
        settingsReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
        refreshReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);

Upvotes: 21

JSBձոգչ
JSBձոգչ

Reputation: 41378

This depends somewhat on your exact needs. If you are writing a C# app and simply want to set the default proxy settings that your app will use, use the class System.Net.GlobalProxySelection (http://msdn.microsoft.com/en-us/library/system.net.globalproxyselection.aspx). You can also set the proxy for any particular connection with System.Net.WebProxy (http://msdn.microsoft.com/en-us/library/system.net.webproxy.aspx).

If you actually want to update the proxy settings in the registry, I believe that you'll need to use P/Invoke to call the WinAPI function WinHttpSetDefaultProxyConfiguration (http://msdn.microsoft.com/en-us/library/aa384113.aspx).

Upvotes: 22

JaredPar
JaredPar

Reputation: 754725

Check out this KB article specifically tagged at what you're trying to do.

http://support.microsoft.com/kb/226473

The short version is you want to use the InternetOpen, InternetSetOption API's to update the proxy settings.

Upvotes: 6

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