DefaultLOgger and IfNull methods

DTLib.csproj

@@ -34,6 +34,7 @@
   <ItemGroup>
     <Compile Include="Color.cs" />
     <Compile Include="CompressedArray.cs" />
+    <Compile Include="DefaultLogger.cs" />
     <Compile Include="Dtsod\DtsodV21.cs" />
     <Compile Include="Dtsod\DtsodV22.cs" />
     <Compile Include="Dtsod\V30\DtsodSerializableAttribute.cs" />

DefaultLogger.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Text;
+using DTLib.Filesystem;
+
+namespace DTLib
+{
+    // вывод лога в консоль и файл
+    public static class DefaultLogger
+    {
+        public static void SetLogfile(string dir, string programName)
+            => logfile = $"{dir}\\{programName}_{DateTime.Now}.log".Replace(':', '-').Replace(' ', '_');
+
+        static string logfile;
+        static readonly SafeMutex LogMutex = new();
+        public static void Log(params string[] msg)
+        {
+            if (msg.Length == 1) msg[0] = "[" + DateTime.Now.ToString() + "]: " + msg[0];
+            else msg[1] = "[" + DateTime.Now.ToString() + "]: " + msg[1];
+            LogNoTime(msg);
+        }
+        public static void LogNoTime(params string[] msg) =>
+            LogMutex.Execute(() =>
+            {
+                ColoredConsole.Write(msg);
+                if (msg.Length == 1) File.AppendAllText(logfile, msg[0]);
+                else
+                {
+                    StringBuilder strB = new();
+                    for (ushort i = 0; i < msg.Length; i++)
+                        strB.Append(msg[++i]);
+                    File.AppendAllText(logfile, strB.ToString());
+                }
+            });
+    }
+}

EventHandlerAsync.cs

@@ -2,7 +2,5 @@
 
 namespace DTLib
 {
-#pragma warning disable IDE1006 // Стили именования
     public delegate Task EventHandlerAsync<TEventArgs>(object sender, TEventArgs e);
-#pragma warning restore IDE1006 // Стили именования
 }

FrameworkFix.cs

@@ -196,5 +196,30 @@ namespace DTLib
 
         public static T If<T>(this T input, bool condition, Func<T, T> if_true, Func<T, T> if_false) =>
             condition ? if_true(input) : if_false(input);
+        public static void If<T>(this T input, bool condition, Action<T> if_true, Action<T> if_false)
+        {
+            if (condition) if_true(input);
+            else if_false(input);
+        }
+        public static T If<T>(this T input, bool condition, Func<T, T> if_true) =>
+            condition ? if_true(input) : input;
+        public static void If<T>(this T input, bool condition, Action<T> if_true)
+        {
+            if (condition) if_true(input);
+        }
+
+        public static T IfIsNull<T>(this T input, Func<T> if_true, Func<T> if_false) =>
+            input is null ? if_true() : if_false();
+        public static void IfIsNull<T>(this T input, Action if_true, Action if_false)
+        {
+            if (input is null) if_true();
+            else if_false();
+        }
+        public static T IfNull<T>(this T input, Func<T> if_true) =>
+            input is null ? if_true() : input;
+        public static void  IfIsNull<T>(this T input, Action if_true)
+        {
+            if (input is null) if_true();
+        }
     }
 }