C Syntax - Example of a Lambda Expression - ForEach over Generic List

Question

First  I know there are methods off of the generic List lt  gt  class already in the framework do iterate over the List lt  gt    But as an example  what is the correct syntax to write a ForEach method to iterate over each object of a List lt  gt   and do a Console WriteLine object ToString    on each object  Something that takes the List lt  gt  as the first argument and the lambda expression as the second argument   Most of the examples I have seen are done as extension methods or involve LINQ  I m looking for a plain-old method example

User · Answer

Is this what you re asking for   int   numbers     1  2  3    numbers ToList   ForEach n   gt  Console WriteLine n

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public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items          action item           and call it thusly   Each myList  i   gt  Console WriteLine i

User · Answer

Is this what you re asking for   int   numbers     1  2  3    numbers ToList   ForEach n   gt  Console WriteLine n

User · Answer

The above could also be written with less code as   new List lt SomeType gt  items  ForEach      i   gt  Console WriteLine i       This creates a generic list and populates it with the IEnumerable and then calls the list objects ForEach

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public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action    foreach  var item in items        action item             and call it thusly   myList Each x   gt    x Enabled   false

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You can traverse each string in the list and even you can search in the whole generic using a single statement this makes searching easier   public static void main string   args    List names   new List     names Add    Saurabh      names Add  Garima    names Add    Vivek      names Add    Sandeep       string stringResult   names Find  name   gt  name Equals    Garima

User · Answer

public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items          action item           and call it thusly   Each myList  i   gt  Console WriteLine i

User · Answer

public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items          action item           and call it thusly   Each myList  i   gt  Console WriteLine i

User · Answer

The above could also be written with less code as   new List lt SomeType gt  items  ForEach      i   gt  Console WriteLine i       This creates a generic list and populates it with the IEnumerable and then calls the list objects ForEach

User · Answer

You can traverse each string in the list and even you can search in the whole generic using a single statement this makes searching easier   public static void main string   args    List names   new List     names Add    Saurabh      names Add  Garima    names Add    Vivek      names Add    Sandeep       string stringResult   names Find  name   gt  name Equals    Garima

User · Answer

public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action    foreach  var item in items        action item             and call it thusly   myList Each x   gt    x Enabled   false

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Want to put out there that there is not much to worry about if someone provides an answer as an extension method because an extension method is just a cool way to call an instance method  I understand that you want the answer without using an extension method  Regardless if the method is defined as static  instance or extension - the result is the same   The code below uses the code from the accepted answer to define an extension method and an instance method and creates a unit test to show the output is the same   public static class Extensions       public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action                foreach  var item in items                        action item                       TestFixture  public class ForEachTests       public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action                foreach  var item in items                        action item                        private string  extensionOutput       private void SaveExtensionOutput string value                 extensionOutput    value             private string  instanceOutput       private void SaveInstanceOutput string value                 instanceOutput    value              Test      public void Test1                 string   teams   new string     cowboys    falcons    browns    chargers    rams    seahawks    lions    heat    blackhawks    penguins    pirates             Each teams  SaveInstanceOutput            teams Each SaveExtensionOutput            Assert AreEqual  extensionOutput   instanceOutput             Quite literally  the only thing you need to do to convert an extension method to an instance method is remove the static modifier and the first parameter of the method   This method  public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items                action item              becomes  public void Each lt T gt  Action lt T gt  action        foreach  var item in items                action item

User · Answer

Want to put out there that there is not much to worry about if someone provides an answer as an extension method because an extension method is just a cool way to call an instance method  I understand that you want the answer without using an extension method  Regardless if the method is defined as static  instance or extension - the result is the same   The code below uses the code from the accepted answer to define an extension method and an instance method and creates a unit test to show the output is the same   public static class Extensions       public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action                foreach  var item in items                        action item                       TestFixture  public class ForEachTests       public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action                foreach  var item in items                        action item                        private string  extensionOutput       private void SaveExtensionOutput string value                 extensionOutput    value             private string  instanceOutput       private void SaveInstanceOutput string value                 instanceOutput    value              Test      public void Test1                 string   teams   new string     cowboys    falcons    browns    chargers    rams    seahawks    lions    heat    blackhawks    penguins    pirates             Each teams  SaveInstanceOutput            teams Each SaveExtensionOutput            Assert AreEqual  extensionOutput   instanceOutput             Quite literally  the only thing you need to do to convert an extension method to an instance method is remove the static modifier and the first parameter of the method   This method  public static void Each lt T gt  this IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items                action item              becomes  public void Each lt T gt  Action lt T gt  action        foreach  var item in items                action item

User · Answer

public void Each lt T gt  IEnumerable lt T gt  items  Action lt T gt  action        foreach  var item in items          action item           and call it thusly   Each myList  i   gt  Console WriteLine i

[c#] C# Syntax - Example of a Lambda Expression - ForEach() over Generic List

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