c# – 设置全局代理设置后无法刷新窗口

我正在尝试使用 Windows注册表启用/禁用Windows全局代理(在Internet选项中).如果我设置了值,我没有任何问题但刷新设置.搜索后我在SO上找到了一个提供代码的问题.但现在的问题是,在应用程序的每个会话中,它只能运行一次.即它第一次工作,如果你想让它再次工作,你必须重新运行该应用程序.任何想法可能是什么问题???这是代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
using System.Runtime.InteropServices;

namespace SystemProxyToggle
{
    public partial class Form1 : Form
    {
        [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 bool settingsReturn,refreshReturn;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender,EventArgs e)
        {
            queryStatus();
        }

        private void btnToggle_Click(object sender,EventArgs e)
        {
            toggleStatus();
            queryStatus();
        }

        private void queryStatus()
        {
            RegistryKey registry = Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindowsCurrentVersionInternet Settings",true);
            int status = (int)registry.GetValue("ProxyEnable");
            if (status == 0)
            {
                lblStatus.Text = "Proxy Is Disabled";
                lblStatus.ForeColor = Color.Maroon;
            }
            else
            {
                lblStatus.Text = "Proxy Is Enabled";
                lblStatus.ForeColor = Color.Green;
            }

            //I added this after I encountered the problem
            //though I don't that this is the problem
            registry.Close();
        }

        private void toggleStatus()
        {
            RegistryKey registry = Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindowsCurrentVersionInternet Settings",true);
            int status = (int)registry.GetValue("ProxyEnable");
            if (status == 1)
            {
                registry.SetValue("ProxyEnable",0);
            }
            else
            {
                registry.SetValue("ProxyEnable",1);
            }
            //Refresh System Settings
            settingsReturn = InternetSetOption(IntPtr.Zero,INTERNET_OPTION_SETTINGS_CHANGED,IntPtr.Zero,0);
            refreshReturn = InternetSetOption(IntPtr.Zero,INTERNET_OPTION_REFRESH,0);

            //I added this after I encountered the problem
            registry.Close();
        }
    }
}

//settingsReturn = InternetSetOption(IntPtr.Zero,0);
//refreshReturn = InternetSetOption(IntPtr.Zero,0);