Aggiunto Mutex x gestione single startup

LPA/App.config

@@ -17,6 +17,8 @@
         <add key="windowCanMax" value="true" />
         <add key="trayClose" value="true" />
         <add key="startOnTray" value="true" />
+        <!--Gestione istanze-->
+        <add key="singleInstance" value="true" />
     </appSettings>
     <runtime>
         <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

LPA/MainForm.cs

@@ -102,6 +102,8 @@ namespace LPA
 
         #region init form + dispose
 
+       
+
         /// <summary>
         /// Classe apertura
         /// </summary>
@@ -111,6 +113,7 @@ namespace LPA
             myInit();
             checkShowTray();
         }
+
         /// <summary>
         /// Medoti init specifici
         /// </summary>

LPA/Program.cs

@@ -1,22 +1,72 @@
-using System;
+using SteamWare.IO;
+using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace LPA
 {
-  static class Program
-  {
-    /// <summary>
-    /// Punto di ingresso principale dell'applicazione.
-    /// </summary>
-    [STAThread]
-    static void Main()
+    static class Program
     {
-      Application.EnableVisualStyles();
-      Application.SetCompatibleTextRenderingDefault(false);
-      Application.Run(new MainForm());
+        /// <summary>
+        /// Mutex x evitare multiple instances
+        /// </summary>
+        static Mutex _m;
+        static bool IsSingleInstance()
+        {
+            try
+            {
+                // Try to open existing mutex.
+                _ = Mutex.OpenExisting("SteamwareLPA");
+            }
+            catch
+            {
+                // If exception occurred, there is no such mutex.
+                Program._m = new Mutex(true, "SteamwareLPA");
+
+                // Only one instance.
+                return true;
+            }
+            // More than one instance.
+            return false;
+        }
+
+
+        /// <summary>
+        /// Punto di ingresso principale dell'applicazione.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            bool enableStartup = true;
+            // se abilitato il controllo istanza (solo 1...)
+            if (memLayer.ML.CRB("singleInstance"))
+            {
+                utils.lgInfo("Single instance only: checking!");
+                if (!Program.IsSingleInstance())
+                {
+                    utils.lgInfo("More than one instance found: exiting");
+                    enableStartup = false;
+                }
+                else
+                {
+                    // Continue with program.
+                    Console.WriteLine("OK! only One instance running");
+                }
+            }
+            else
+            {
+                utils.lgInfo("Multiple instance allowed: check not requested");
+            }
+            // se abilitato procedo
+            if (enableStartup)
+            {
+                Application.EnableVisualStyles();
+                Application.SetCompatibleTextRenderingDefault(false);
+                Application.Run(new MainForm());
+            }
+        }
     }
-  }
 }