Initial commit

.gitignore

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+bin
+obj
+.vs

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+</configuration>

Program.cs

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+using Microsoft.Win32;
+using System;
+using System.Drawing;
+using System.Management;
+using System.Security.Principal;
+using System.Windows.Forms;
+
+namespace ProxyTray
+{
+    internal static class Program
+    {
+        const string KeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";
+        static readonly string StatusChangeEventQuery = (
+            "SELECT * FROM RegistryValueChangeEvent WHERE " +
+            $"Hive = 'HKEY_USERS' AND KeyPath = '{WindowsIdentity.GetCurrent().User.Value}\\{KeyPath}' " +
+            "AND (ValueName = 'ProxyEnable' or ValueName = 'ProxyServer')"
+            ).Replace(@"\", @"\\");
+        const string None = "<None>";
+
+        static Icon ProxyOnIcon;
+        static Icon ProxyOffIcon;
+        static NotifyIcon Tray;
+
+        static bool ProxyEnable;
+        static string ProxyServer;
+
+        static void Initialize()
+        {
+            ProxyOnIcon = new Icon("ProxyOn.ico");
+            ProxyOffIcon = new Icon("ProxyOff.ico");
+
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+        }
+
+        static void CreateTray()
+        {
+            var menuItem = new MenuItem
+            {
+                Index = 0,
+                Text = "Quit"
+            };
+            menuItem.Click += (sender, e) => Application.Exit();
+            Tray = new NotifyIcon
+            {
+                ContextMenu = new ContextMenu(new[] { menuItem }),
+                Visible = true
+            };
+            Tray.MouseClick += (sender, e) =>
+            {
+                if (e.Button != MouseButtons.Left) return;
+                if (ProxyServer == None)
+                {
+                    MessageBox.Show("'ProxyServer' not configured");
+                    return;
+                }
+                using (var key = Registry.CurrentUser.OpenSubKey(KeyPath, true))
+                {
+                    key.SetValue("ProxyEnable", ProxyEnable ? 0 : 1);
+                }
+            };
+        }
+
+        static void RefreshTray()
+        {
+            using (var key = Registry.CurrentUser.OpenSubKey(KeyPath))
+            {
+                ProxyEnable = (int)(key.GetValue("ProxyEnable", 0)) != 0;
+                ProxyServer = (string)(key.GetValue("ProxyServer", None));
+            }
+            Tray.Icon = ProxyEnable ? ProxyOnIcon : ProxyOffIcon;
+            Tray.Text = ProxyEnable ? ProxyServer : "Direct";
+        }
+
+        [STAThread]
+        static void Main()
+        {
+            try
+            {
+                Initialize();
+                CreateTray();
+                RefreshTray();
+
+                using (var watcher = new ManagementEventWatcher(StatusChangeEventQuery))
+                {
+                    watcher.EventArrived += (sender, e) => RefreshTray();
+                    watcher.Start();
+                    Application.Run();
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.ToString());
+            }
+        }
+    }
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Proxy Tray")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Proxy Tray")]
+[assembly: AssemblyCopyright("Copyright © 2023 Lingxi Li")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("c48afb87-3942-40af-be7c-7d9f7e508458")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

ProxyTray.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{C48AFB87-3942-40AF-BE7C-7D9F7E508458}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>ProxyTray</RootNamespace>
+    <AssemblyName>ProxyTray</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>x64</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>x64</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Management" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Deployment" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="ProxyOff.ico">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="ProxyOn.ico">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

ProxyTray.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33829.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ProxyTray", "ProxyTray.csproj", "{C48AFB87-3942-40AF-BE7C-7D9F7E508458}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C48AFB87-3942-40AF-BE7C-7D9F7E508458}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C48AFB87-3942-40AF-BE7C-7D9F7E508458}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C48AFB87-3942-40AF-BE7C-7D9F7E508458}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C48AFB87-3942-40AF-BE7C-7D9F7E508458}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {26037BBC-A4A2-477A-8BF1-5BB89FD1A223}
+	EndGlobalSection
+EndGlobal

README.md

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+# Proxy Tray
+
+A Windows tray app that monitors WinINet proxy settings for LAN (not VPN) and enables quick proxy on/off switch.
+
+- A blue/yellow tray icon indicates proxy off/on status, respectively.
+- A mouse hover-over tip shows proxy server info when proxy is on or "Direct" when off.
+- Left click on the tray icon toggles proxy on/off status. Proxy server info must be pre-configured externally.
+- Quit with "Quit" in right-click context menu.
+
+Targets .NET Framework 4.8 that is included in Windows 11.