Remove warnings regarding possible references to NULL

Tidstagning/AboutBox.cs

@@ -40,7 +40,14 @@ namespace Tidstagning
         {
             get
             {
-                return Assembly.GetExecutingAssembly().GetName().Version.ToString();
+                if (Assembly.GetExecutingAssembly().GetName().Version != null)
+                {
+                    return Assembly.GetExecutingAssembly().GetName().Version.ToString();
+                } 
+                else
+                {
+                    return "N/A";
+                }
             }
         }
 

Tidstagning/MainUI.cs

@@ -19,7 +19,7 @@ namespace Tidstagning
         {
             InitializeComponent();
             System.IO.StreamReader deltager_handle = new System.IO.StreamReader(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/Tidstagning/" + "Deltager.txt");
-            string deltager;
+            string? deltager;
             while ((deltager = deltager_handle.ReadLine()) != null)
             {
                 string[] dele = deltager.Split(',');

Tidstagning/Procedure.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-
+using System.Threading;
 namespace Tidstagning
 {
     class Procedure
@@ -11,7 +11,7 @@ namespace Tidstagning
         List<DateTime> signaler;
         uint signalLength = 500;
 
-        System.Threading.Timer? timer;
+        Timer? delayTimer;
         Int16 idx = 0;
 
         public Procedure()
@@ -22,7 +22,7 @@ namespace Tidstagning
         public void ReadFile(string file)
         {
             System.IO.StreamReader procedure_handle = new System.IO.StreamReader(file);
-            string line;
+            string? line;
             while ((line = procedure_handle.ReadLine()) != null)
             {
                 addEntry(line);
@@ -76,8 +76,8 @@ namespace Tidstagning
         {
             signaler = new List<DateTime>();
             idx = 0;
-            if (timer != null)
+            if (delayTimer != null)
-                timer.Dispose();
+                delayTimer.Dispose();
         }
 
         public void setObjects(Relay horn_obj, ResultList log_obj)
@@ -114,18 +114,22 @@ namespace Tidstagning
                 Run();
                 return;//time already passed
             }
-            log.Write("Næste signal: " + alertTime.ToString(@"HH\:mm\:ss") + " Om: " + timeToGo.ToString(@"hh\:mm\:ss"));
+            if (log is not null)
-            timer = new System.Threading.Timer(x =>
             {
-                this.Alarm();
+                log.Write("Næste signal: " + alertTime.ToString(@"HH\:mm\:ss") + " Om: " + timeToGo.ToString(@"hh\:mm\:ss"));
-            }, null, timeToGo, new System.TimeSpan(0));
+            }
+            delayTimer = new Timer(x =>
+             {
+                 this.Alarm();
+             }, null, timeToGo, new TimeSpan(0));
         }
 
         private void Alarm()
         {
-            log.Write("HORN!");
+            if(log is not null)
-
+                log.Write("HORN!");
-            horn.Sound(signalLength);
+            if(horn is not null)
+                horn.Sound(signalLength);
             next();
             Run();
 

Tidstagning/Relay.cs

@@ -9,7 +9,6 @@ namespace Tidstagning
     class Relay
     {
         SerialPort com;
-        System.Threading.Timer? cooldownTimer;
 
         struct SignalSpec
         {
@@ -89,7 +88,7 @@ namespace Tidstagning
                     Off();
                 }
 
-                cooldownTimer = new System.Threading.Timer(x =>
+                System.Threading.Timer cooldownTimer = new System.Threading.Timer(x =>
                 {
                     signals.Dequeue();
                     Run();

Tidstagning/ResultList.cs

@@ -4,16 +4,15 @@ namespace Tidstagning
 {
     class ResultList
     {
-
+        System.IO.StreamWriter filehandle_log;
-        System.IO.StreamWriter filehandle;
+        System.IO.StreamWriter filehandle_results;
-        System.IO.StreamWriter filehandle2;
         Tidstagning.MainUI parentForm;
         string racenumber = "";
         public ResultList(string filename, Tidstagning.MainUI log_object)
         {
             filename = MakeSafeFilename(filename, '_');
-            filehandle = new System.IO.StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/Tidstagning/" + filename + "_" + DateTime.Now.ToString(" dd-MM-yyyy HH-mm-ss") + ".txt");
+            filehandle_log = new System.IO.StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/Tidstagning/" + filename + "_" + DateTime.Now.ToString(" dd-MM-yyyy HH-mm-ss") + ".txt");
-            filehandle2 = new System.IO.StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/Tidstagning/" + filename + "_" + DateTime.Now.ToString(" dd-MM-yyyy HH-mm-ss") + ".csv");
+            filehandle_results = new System.IO.StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "/Tidstagning/" + filename + "_" + DateTime.Now.ToString(" dd-MM-yyyy HH-mm-ss") + ".csv");
             parentForm = log_object;
         }
 
@@ -58,21 +57,21 @@ namespace Tidstagning
 
         public void Write(string textstring)
         {
-            filehandle.WriteLine(textstring);
+            filehandle_log.WriteLine(textstring);
             parentForm.LogAppend(textstring + "\r\n");
-            filehandle.Flush();
+            filehandle_log.Flush();
         }
 
         public void WriteCSV(string textstring)
         {
-            filehandle2.WriteLine(textstring);
+            filehandle_results.WriteLine(textstring);
-            filehandle2.Flush();
+            filehandle_results.Flush();
         }
 
         public void Close()
         {
-            filehandle.Close();
+            filehandle_log.Close();
-            filehandle2.Close();
+            filehandle_results.Close();
         }
 
     }