Advanced  Services

Dot Notation versus Linq

/*
*/
private static void Beispiel1_Array()
{
   // klassisch
   string[] stringArr = { "Heinrich Mann", "Thomas Mann", "Bertolt Brecht", "Arthur Schnitzler", "Klaus Mann", "Erika Mann", "Karl Kraus" };
   string[] dieManns = new string[4];

   Console.WriteLine("-------------- dotnotation ----------------");
   int i = 0;
   foreach (string s in stringArr)
   {
      if (s.EndsWith("Mann"))
      {
         dieManns[i++] = s;
      }
   }
   Array.Sort(dieManns);
   foreach (string s in dieManns)
   {
      Console.WriteLine(s);
   }

   // Linq
   Console.WriteLine("------------------ Linq -------------------");
   //IEnumerable<string> enu = from name in stringArr where name.EndsWith("Mann") orderby name select name;
   // oder auch
   var enu = from name in stringArr where name.EndsWith("Mann") orderby name select name;
   foreach(string s in enu)
   {
      Console.WriteLine(s);
   }
   Console.WriteLine("------------- Linq + Lambda ---------------");
   //  nur List hat ein Foreach
   (from name in stringArr where name.EndsWith("Mann") orderby name select name).ToList().ForEach(s => Console.WriteLine(s));
}
}

      /*
      */
      private static void Beispiel2_List()
      {
         // klassisch
         string[] stringArr = { "Heinrich Mann", "Thomas Mann", "Bertolt Brecht", "Arthur Schnitzler", "Klaus Mann", "Erika Mann", "Karl Kraus" };
         List<string> stringList = stringArr.ToList();
         List<string> dieManns = new List<string>();

         Console.WriteLine("-------------- dotnotation ----------------");
         int i = 0;
         foreach (string s in stringList)
         {
            if (s.EndsWith("Mann"))
            {
               dieManns.Add(s);
            }
         }
         dieManns.Sort();
         foreach (string s in dieManns)
         {
            Console.WriteLine(s);
         }

         // Linq
         Console.WriteLine("------------------ Linq -------------------");
         //IEnumerable<string> enu = from name in stringArr where name.EndsWith("Mann") orderby name select name;
         // oder auch
         var enu = from name in stringList where name.EndsWith("Mann") orderby name select name;
         foreach (string s in enu)
         {
            Console.WriteLine(s);
         }
         Console.WriteLine("------------- Linq + Lambda ---------------");
         //  nur List hat ein Foreach
         (from name in stringList where name.EndsWith("Mann") orderby name select name) .ToList().ForEach(s => Console.WriteLine(s));
      }

/*
*/
private static void Beispiel1_AlleKlassenInMscorlib()
{
   // klassisch + lambda
   Assembly mscorlib = Assembly.Load("mscorlib");  // System.Reflection
   List<Type> mscorlibTypes = mscorlib.GetTypes().ToList();
   //Console.WriteLine(mscorlibTypes.Count);
   List<string> mscorlibStrings = mscorlibTypes.ConvertAll(t => t.Name);  // Converter Delegate
   mscorlibStrings.Sort();
   List<string> startsWithQ = mscorlibStrings.FindAll(s => s.StartsWith("Q"));  // Predicate
   Console.WriteLine();
   startsWithQ.ForEach(t => Console.WriteLine(t));  // Action Delegate
   Console.WriteLine();

   // dotnotaion klassisch + lambda
   var list = Assembly.Load("mscorlib").GetTypes().ToList().ConvertAll(t => t.Name).FindAll(s => s.StartsWith("Q"));
   list.Sort();
   list.ForEach(t => Console.WriteLine(t));
   Console.WriteLine();

   // Linq
   //var enu = from name in Assembly.Load("mscorlib").GetTypes() orderby name.Name select name;
   //enu.ToList().ForEach(s => Console.WriteLine(s.Name));

   (from name in Assembly.Load("mscorlib").GetTypes() orderby name.Name select name).ToList().ForEach(s => Console.WriteLine(s.Name));
}

/*
*/
private static void Beispiel2_AlleExceptionsInMscorlib()
{
   // klassisch
   // klassisch + lambda
   Assembly mscorlib = Assembly.Load("mscorlib");  // System.Reflection
   List<Type> mscorlibTypes = mscorlib.GetTypes().ToList();
   List<Type> exceptionList = mscorlibTypes.FindAll(t => t.IsSubclassOf(typeof(System.Exception)));  // Predicate
   List<string> exceptionStringList = exceptionList.ConvertAll(t => t.Name);  // Converter Delegate
   exceptionStringList.Sort();
   exceptionStringList.ForEach(t => Console.WriteLine(t));  // Action Delegate
   Console.WriteLine();

   // Linq
   //var enu = from name in Assembly.Load("mscorlib").GetTypes() orderby name.Name select name;
   var enu = from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.Exception)) orderby name.Name select name;
   enu.ToList().ForEach(s => Console.WriteLine(s.Name));
   // oder
   //(from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.Exception)) orderby name.Name select name).ToList().ForEach(s => Console.WriteLine(s.Name));
}

private static void Beispiel3_AlleDelegatesInMscorlib()
{
   // klassisch
   // klassisch + lambda
   Assembly mscorlib = Assembly.Load("mscorlib");  // System.Reflection
   List<Type> mscorlibTypes = mscorlib.GetTypes().ToList();
   List<Type> exceptionList = mscorlibTypes.FindAll(t => t.IsSubclassOf(typeof(System.MulticastDelegate)));  // Predicate
   List<string> exceptionStringList = exceptionList.ConvertAll(t => t.Name);  // Converter Delegate
   exceptionStringList.Sort();
   exceptionStringList.ForEach(t => Console.WriteLine(t));  // Action Delegate
   Console.WriteLine();

   // Linq
   //var enu = from name in Assembly.Load("mscorlib").GetTypes() orderby name.Name select name;
   var enu = from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.MulticastDelegate)) orderby name.Name select name;
   enu.ToList().ForEach(s => Console.WriteLine(s.Name));
   // oder
   //(from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.MulticastDelegate)) orderby name.Name select name).ToList().ForEach(s => Console.WriteLine(s.Name));
}

private static void Beispiel4_AlleValueTypesInMscorlib()
{
   // klassisch
   // klassisch + lambda
   Assembly mscorlib = Assembly.Load("mscorlib");  // System.Reflection
   List<Type> mscorlibTypes = mscorlib.GetTypes().ToList();
   List<Type> exceptionList = mscorlibTypes.FindAll(t => t.IsSubclassOf(typeof(System.ValueType)));  // Predicate
   List<string> exceptionStringList = exceptionList.ConvertAll(t => t.Name);  // Converter Delegate
   exceptionStringList.Sort();
   exceptionStringList.ForEach(t => Console.WriteLine(t));  // Action Delegate
   Console.WriteLine();

   // Linq
   //var enu = from name in Assembly.Load("mscorlib").GetTypes() orderby name.Name select name;
   var enu = from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.ValueType)) orderby name.Name select name;
   enu.ToList().ForEach(s => Console.WriteLine(s.Name));
   // oder
   //(from name in Assembly.Load("mscorlib").GetTypes() where name.IsSubclassOf(typeof(System.ValueType)) orderby name.Name select name).ToList().ForEach(s => Console.WriteLine(s.Name));
}