How to display list items on console window in C

Question

I have a List which contains all databases names  I have to dispaly the items contained in that list in the Console  using Console WriteLine     How can I achieve this

User · Answer

I found this easier to understand   List lt string gt  names   new List lt string gt     One    Two    Three    Four    Five             for  int i   0  i  lt  names Count  i                          Console WriteLine names i

User · Answer

While the answers with List lt T gt  ForEach are very good   I found String Join lt T gt  string separator  IEnumerable lt T gt  values  method more useful   Example    List lt string gt  numbersStrLst   new List lt string gt                 One    Two    Three   Four   Five     Console WriteLine String Join       numbersStrLst     Output  One  Two  Three  Four  Five   int   numbersIntAry   new int    1  2  3  4  5   Console WriteLine String Join       numbersIntAry     Output  1  2  3  4  5    Remarks    If separator is null  an empty string  String Empty  is used instead  If any member of values is null  an empty string is used instead   Join String  IEnumerable lt String gt   is a convenience method that lets you concatenate each element in an IEnumerable Of String  collection without first converting the elements to a string array  It is particularly useful with Language-Integrated Query  LINQ  query expressions    This should work just fine for the problem  whereas for others  having array values  Use other overloads of this same method  String Join Method  String  Object     Reference  https   msdn microsoft com en-us library dd783876 v vs 110  aspx

User · Answer

Actually you can do it pretty simple  since the list have a ForEach method and since you can pass in Console WriteLine as a method group  The compiler will then use an implicit conversion to convert the method group to  in this case  an Action lt int gt  and pick the most specific method from the group  in this case Console WriteLine int      var list   new List lt int gt  Enumerable Range 0  50       list ForEach Console WriteLine     Works with strings too     To be utterly pedantic  and I m not suggesting a change to your answer - just commenting for the sake of interest  Console WriteLine is a method group  The compiler then uses an implicit conversion from the method group to Action lt int gt   picking the most specific method  Console WriteLine int  in this case

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You can also use List s inbuilt foreach  such as   List lt T gt  ForEach item   gt  Console Write item      This code also runs significantly faster   The above code also makes you able to manipulate Console WriteLine  such as doing   List lt T gt  ForEach item   gt  Console Write item            Put a b etc

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Assume that we need to view some data in command prompt which are coming from a database table  First we create a list  Team Details is my property class       List lt Team Details gt  teamDetails   new List lt Team Details gt       Then you can connect to the database and do the data retrieving part and save it to the list as follows               string connetionString    Data Source   Initial Catalog your DB name Integrated Security True MultipleActiveResultSets True               using  SqlConnection conn   new SqlConnection connetionString                string getTeamDetailsQuery    select   from Team               conn Open                using  SqlCommand cmd   new SqlCommand getTeamDetailsQuery  conn                                                 SqlDataReader rdr   cmd ExecuteReader                                                  teamDetails Add new Team Details                                                       Team Name   rdr GetString rdr GetOrdinal  Team Name                                 Team Lead   rdr GetString rdr GetOrdinal  Team Lead                                                         Then you can print this list in command prompt as follows   foreach  Team Details i in teamDetails                                                        Console WriteLine i Team Name                               Console WriteLine i Team Lead

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Assuming the items override ToString appropriately   public void WriteToConsole IEnumerable items        foreach  object o in items                Console WriteLine o              There d be no advantage in using generics in this loop - we d end up calling Console WriteLine object  anyway  so it would still box just as it does in the foreach part in this case    EDIT  The answers using List lt T gt  ForEach are very good   My loop above is more flexible in the case where you have an arbitrary sequence  e g  as the result of a LINQ expression   but if you definitely have a List lt T gt  I d say that List lt T gt  ForEach is a better option   One advantage of List lt T gt  ForEach is that if you have a concrete list type  it will use the most appropriate overload  For example   List lt int gt  integers   new List lt int gt    1  2  3    List lt string gt  strings   new List lt string gt     a    b    c      integers ForEach Console WriteLine   strings ForEach Console WriteLine     When writing out the integers  this will use Console WriteLine int   whereas when writing out the strings it will use Console WriteLine string   If no specific overload is available  or if you re just using a generic List lt T gt  and the compiler doesn t know what T is  it will use Console WriteLine object    Note the use of Console WriteLine as a method group  by the way  This is more concise than using a lambda expression  and actually slightly more efficient  as the delegate will just be a call to Console WriteLine  rather than a call to a method which in turn just calls Console WriteLine

User · Answer

Console WriteLine string Join lt TYPE gt    n   someObjectList

[c#] How to display list items on console window in C#

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