Changed to a more robust way using the Hub as fallback if a version isn't installed

Author: GPR-ZRH

UnityProjectLauncher/Program.cs

@@ -1,30 +1,70 @@
 using System.IO;
 using System.Diagnostics;
+using System;
 
 namespace UnityProjectLauncher
 {
     class Program
     {
         static void Main()
         {
-            if (Directory.Exists(@".\Assets"))
+            if (File.Exists(@".\ProjectSettings\ProjectVersion.txt"))
             {
-                string[] paths = Directory.GetFiles(@".\Assets", "*.unity", SearchOption.AllDirectories);
-                if(paths.Length > 0)
+                string[] lines = File.ReadAllLines(@".\ProjectSettings\ProjectVersion.txt");
+                string version = lines[0].Substring(lines[0].IndexOf(":") + 2);
+                string changeset = lines[1].Substring(lines[1].IndexOf("(") + 1).Replace(")","");
+
+                string path = @$"C:\Program Files\Unity\Hub\Editor\{version}\Editor\";
+                Console.WriteLine(path);
+                string argument = $"-projectPath \"{Directory.GetCurrentDirectory()}\"\\";
+                Console.WriteLine(argument);
+                
+
+                ProcessStartInfo processStartInfo = new ProcessStartInfo("Unity.exe", argument);
+                processStartInfo.WorkingDirectory = path;
+                processStartInfo.UseShellExecute = true;
+                try
                 {
-                    ProcessStartInfo processStartInfo = new ProcessStartInfo(paths[0]);
-                    processStartInfo.UseShellExecute = true;
-                    Process.Start(processStartInfo);
+                    Process process = Process.Start(processStartInfo);
                 }
-                else
+                catch (Exception exception)
                 {
-                    File.AppendAllLines("LauncherLog.txt", new string[]{ "Error: Could not find a scene file. Make sure your project does have a scene file within the Assets or one of its subfolders!"});
+                    Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\Logs");
+                    File.AppendAllLines(Directory.GetCurrentDirectory() + "\\Logs\\LauncherLog.txt", new string[] { exception.Message, "If it can't find the file, it's most likely a missing unity version. Install the correct Unity Version and try again." });
+
+                    ProcessStartInfo hubProcess = new ProcessStartInfo("Unity Hub.exe", $"-- --headless install --version {version} --changeset {changeset}");
+                    hubProcess.WorkingDirectory = @$"C:\Program Files\Unity Hub\";
+                    hubProcess.UseShellExecute = true;
+                    try
+                    {
+                        Process hub = Process.Start(hubProcess);
+                        hub.Exited += Hub_Exited;
+                    }
+                    catch (Exception)
+                    {
+                        Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\Logs");
+                        File.AppendAllLines(Directory.GetCurrentDirectory() + "\\Logs\\LauncherLog.txt", new string[] { exception.Message, "If it can't find the file, it's most likely a missing unity version. Install the correct Unity Version and try again." });
+
+                        throw;
+                    }
                 }
             }
             else
             {
-                File.AppendAllLines("LauncherLog.txt", new string[] { "Error: Could not find a scene file because there was no Asset folder present. Make sure this Executable is placed in a Unity Project Folder (Not inside the Asset folder)!" });
+                Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\Logs");
+                File.AppendAllLines(Directory.GetCurrentDirectory() + "\\Logs\\LauncherLog.txt", new string[] { "Error: Could not find a scene file. Make sure your project does have a scene file within the Assets or one of its subfolders!" });
             }
         }
+
+        private static void Hub_Exited(object sender, EventArgs e)
+        {
+            Main();
+        }
+
+        private static void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
+        {
+            Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\Logs");
+            File.AppendAllText(Directory.GetCurrentDirectory()+"\\Logs\\LauncherLog.txt", "\n"+e.Data);
+        }
     }
 }

UnityProjectLauncher/UnityProjectLauncher.csproj

@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0-windows</TargetFramework>
     <ApplicationIcon>unityplayer64.ico</ApplicationIcon>
     <Authors>Michael Meier</Authors>
     <Company>Meier-Digital</Company>
@@ -11,6 +11,7 @@
     <PackageProjectUrl>https://www.meier-digital.com</PackageProjectUrl>
     <PackageIcon>UnityPlayerIcon.png</PackageIcon>
     <SignAssembly>true</SignAssembly>
+    <ProduceReferenceAssembly>False</ProduceReferenceAssembly>
   </PropertyGroup>
 
   <ItemGroup>