From: misomosi <misomosispi@gmail.com>
Date: Mon, 18 May 2026 18:28:35 +0000 (-0400)
Subject: Restart for both .NET 4.x and .NET 5.0+
X-Git-Url: http://git.misomosispi.com/?a=commitdiff_plain;h=a776c909d640e1c9848ca963fc1c20c1aae325d1;p=gists.git

Restart for both .NET 4.x and .NET 5.0+
---

diff --git a/DotnetProcessRestart/.gitignore b/DotnetProcessRestart/.gitignore
index ca5b692..431fe7c 100644
--- a/DotnetProcessRestart/.gitignore
+++ b/DotnetProcessRestart/.gitignore
@@ -5,3 +5,6 @@
 obj/
 bin/
 lib/
+
+# Test-specific ignores
+restart.txt
diff --git a/DotnetProcessRestart/ProcessRestart.cs b/DotnetProcessRestart/ProcessRestart.cs
index 85af26a..72f7bfb 100644
--- a/DotnetProcessRestart/ProcessRestart.cs
+++ b/DotnetProcessRestart/ProcessRestart.cs
@@ -1,36 +1,87 @@
 using System;
+using System.IO;
 using System.Runtime.InteropServices;
+using System.Text;
+
 class RestartExample {
 #if NET5_0_OR_GREATER
+	// Simpler restart for .NET Core
 	public static void Restart() {
-		System.Console.WriteLine("Core!");
-		// Use ProcessStartInfo.ArgumentList to pass args
+		string[] args = Environment.GetCommandLineArgs();
+		System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo(args[0]);
+		for (int i = 1; i < args.Length; i++)
+			psi.ArgumentList.Add(args[i]);
+		psi.UseShellExecute = false;
+		System.Diagnostics.Process.Start(psi);
 		Environment.Exit(0);
 	}
 #else
-	// Technically an unsafe API but we keep it private
+	// ArgumentList in ProcessStartInfo isn't always present before .NET 5.0
+	// Restart using KERNEL32's CreateProcessW and Environment.CommandLine
+	// We have a lot of unsafe structs and imports, so
+	// keep them private and just use them for the restart
+	[StructLayout(LayoutKind.Sequential)]
+	private struct STARTUPINFOW
+	{
+		public uint cb;
+		public IntPtr lpReserved;    // char *
+		public IntPtr lpDesktop;     // char *
+		public IntPtr lpTitle;       // char *
+		public uint dwX;
+		public uint dwY;
+		public uint dwXSize;
+		public uint dwYSize;
+		public uint dwXCountChars;
+		public uint dwYCountChars;
+		public uint dwFillAttribute; 
+		public uint dwFlags;
+		public ushort uShowWindow;
+		public ushort cbReserved2;
+		public IntPtr lpReserved2;   // void *
+		public IntPtr hStdInput;     // HANDLE
+		public IntPtr hStdOutput;    // HANDLE
+		public IntPtr hStdError;     // HANDLE
+	}
+	[StructLayout(LayoutKind.Sequential)]
+	private struct PROCESS_INFORMATION
+	{
+		IntPtr hProcess;  // HANDLE
+		IntPtr hThread;   // HANDLE
+		uint dwProcessId;
+		uint dwThreadId;
+	}
+	// SECURITY_ATTRIBUTES not needed, so not defined
 	[DllImport("KERNEL32.dll", ExactSpelling=true, SetLastError=true)]
 	private static extern int CreateProcessW(
-		string lpApplicationName,
-		char[] lpCommandLine,
-		IntPtr lpProcesAttributes,
-		IntPtr lpThreadAttributes,
+		[MarshalAs(UnmanagedType.LPWStr)] string lpApplicationName,
+		[MarshalAs(UnmanagedType.LPWStr)] StringBuilder lpCommandLine,
+		IntPtr lpProcesAttributes,  // SECURITY_ATTRIBUTES *
+		IntPtr lpThreadAttributes,  // SECURITY_ATTRIBUTES *
 		int bInheritHandles,
 		uint dwCreationFlags,
-		IntPtr lpEnvironment,
-		string lpCurrentDirectory,
-		IntPtr lpStartupInfo,
-		IntPtr lpProcessInformation
+		IntPtr lpEnvironment,       // void *
+		[MarshalAs(UnmanagedType.LPWStr)] string lpCurrentDirectory,
+		ref STARTUPINFOW lpStartupInfo,
+		out PROCESS_INFORMATION lpProcessInformation
 	);
 	public static void Restart() {
-		Console.WriteLine("Windows!");
-		char[] lpCommandLine = Environment.CommandLine.ToCharArray();
-		// Use CreateProcessW with lpCommandLine to relaunch process
+		StringBuilder lpCommandLine = new StringBuilder(Environment.CommandLine);
+		STARTUPINFOW si = new STARTUPINFOW();
+		PROCESS_INFORMATION pi = new PROCESS_INFORMATION();
+		si.cb = (uint)Marshal.SizeOf(si);
+		CreateProcessW(null, lpCommandLine, IntPtr.Zero, IntPtr.Zero, 0, 0, IntPtr.Zero, null, ref si, out pi);
 		Environment.Exit(0);
 	}
 #endif
 
 	public static void Main(string[] args) {
-		Restart();
+		string fname = "restart.txt";
+		if (File.Exists(fname)) {
+			Console.WriteLine("Restarted!");
+		} else {
+			Console.WriteLine("Restarting!");
+			File.WriteAllText(fname, "");
+			Restart();
+		}
 	}
 }