Added ObsoleteSingleInstance to prevent breaking projects

Author: soheilkd

src/ObsoleteSingleInstance.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Windows;
+using TinyIpc.Messaging;
+
+namespace SingleInstanceCore
+{
+	[Obsolete("Use non-generic SingleInstance class instead. Check updated example on Github https://github.com/soheilkd/SingleInstanceCore")]
+	public static class SingleInstance<TApplication>
+		where TApplication : Application, ISingleInstance
+	{
+		private const string channelNameSufflix = ":SingeInstanceIPCChannel";
+		private static Mutex singleMutex;
+		private static TinyMessageBus messageBus; //IPC message bus for communication between instances
+
+		/// <summary>
+		/// Intended to be on app startup
+		/// Initializes service if the call is from first instance
+		/// Signals the first instance if it already exists
+		/// </summary>
+		/// <param name="uniqueName">A unique name for IPC channel</param>
+		/// <returns>Whether the call is from application's first instance</returns>
+		public static bool InitializeAsFirstInstance(string uniqueName)
+		{
+			var CommandLineArgs = GetCommandLineArgs(uniqueName);
+			var applicationIdentifier = uniqueName + Environment.UserName;
+			var channelName = $"{applicationIdentifier}{channelNameSufflix}";
+			singleMutex = new Mutex(true, applicationIdentifier, out var firstInstance);
+
+			if (firstInstance)
+				CreateRemoteService(channelName);
+			else
+				SignalFirstInstance(channelName, CommandLineArgs);
+
+			return firstInstance;
+		}
+
+		private static void SignalFirstInstance(string channelName, IList<string> commandLineArgs) => new TinyMessageBus(channelName).PublishAsync(commandLineArgs.Serialize());
+
+		private static void CreateRemoteService(string channelName)
+		{
+			messageBus = new TinyMessageBus(channelName);
+			messageBus.MessageReceived += MessageBus_MessageReceived;
+		}
+
+		private static void MessageBus_MessageReceived(object sender, TinyMessageReceivedEventArgs e)
+		{
+			var app = Application.Current as TApplication;
+			var args = e.Message.Deserialize<string[]>();
+			app.OnInstanceInvoked(args);
+		}
+
+		private static string[] GetCommandLineArgs(string uniqueApplicationName)
+		{
+			var args = Environment.GetCommandLineArgs();
+			if (args == null)
+			{
+				// Try getting commandline arguments from shared location in case of ClickOnce deployed application  
+				var appFolderPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), uniqueApplicationName);
+				var cmdLinePath = Path.Combine(appFolderPath, "cmdline.txt");
+				if (File.Exists(cmdLinePath))
+				{
+					try
+					{
+						using var reader = new StreamReader(cmdLinePath, Encoding.Unicode);
+						args = NativeMethods.CommandLineToArgvW(reader.ReadToEnd());
+						File.Delete(cmdLinePath);
+					}
+					catch (IOException) { }
+				}
+			}
+			return args ?? Array.Empty<string>();
+		}
+
+		public static void Cleanup()
+		{
+			if (messageBus != null)
+			{
+				messageBus.Dispose();
+				messageBus = null;
+			}
+			if (singleMutex != null)
+			{
+				singleMutex.Close();
+				singleMutex = null;
+			}
+		}
+	}
+}

src/SingleInstanceCore.csproj

@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
+    <useWPF>true</useWPF>
     <Authors>soheilkd</Authors>
     <Company />
     <PackageProjectUrl>https://github.com/soheilkd/SingleInstanceCore</PackageProjectUrl>

src/SingleInstanceCore.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.29806.167
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SingleInstanceCore", "SingleInstanceCore.csproj", "{215AAC6C-2C2D-4A1C-B8A3-A68545A00983}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SingleInstanceCore", "SingleInstanceCore.csproj", "{215AAC6C-2C2D-4A1C-B8A3-A68545A00983}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution