Storing data into list with class

Question

I have the following class   public class EmailData       public string FirstName  set  get        public string LastName   set  get        public string Location  set  get        I then did the following but was not working properly   List lt EmailData gt  lstemail   new List lt EmailData gt      lstemail Add  JOhn   Smith   Los Angeles      I get a message that says no overload for method takes 3 arguments

User · Answer

Here s the extension method version   public static class ListOfEmailDataExtension       public static void Add this List lt EmailData gt  list           string firstName  string lastName  string location                if  null    list              throw new NullReferenceException             var emailData   new EmailData                                                               FirstName   firstName                                   LastName   lastName                                   Location   location                                        list Add emailData             Usage   List lt EmailData gt  myList   new List lt EmailData gt     myList Add  Ron    Klein    Israel

User · Answer

If you want to instantiate and add in the same line  you d have to do something like this   lstemail Add new EmailData   FirstName    JOhn   LastName    Smith   Location    Los Angeles        or just instantiate the object prior  and add it directly in   EmailData data   new EmailData    data FirstName    JOhn   data LastName    Smith   data Location    Los Angeles   lstemail Add data

User · Answer

One way in one line  to do it is like this   listemail Add new EmailData  FirstName    John   LastName    Smith   Location    Los Angeles

User · Answer

You re not adding a new instance of the class to the list  Try this   lstemail Add new EmailData   FirstName  John   LastName  Smith   Location  Los Angeles         List is a generic class  When you specify a List lt EmailData gt   the Add method is expecting an object that s of type EmailData  The example above  expressed in more verbose syntax  would be   EmailData data   new EmailData    data FirstName  John   data LastName  Smith  data Location    Los Angeles   lstemail Add data

User · Answer

How do you expect List lt EmailData gt  Add to know how to turn three strings into an instance of EmailData  You re expecting too much of the Framework  There is no overload of List lt T gt  Add that takes in three string parameters  In fact  the only overload of List lt T gt  Add takes in a T  Therefore  you have to create an instance of EmailData and pass that to List lt T gt  Add  That is what the above code does   Try   lstemail Add new EmailData       FirstName    JOhn        LastName    Smith       Location    Los Angeles        This uses the C  object initialization syntax  Alternatively  you can add a constructor to your class  public EmailData string firstName  string lastName  string location        this FirstName   firstName      this LastName   lastName      this Location   location      Then   lstemail Add new EmailData  JOhn    Smith    Los Angeles

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EmailData clsEmailData   new EmailData    List lt EmailData gt  lstemail   new List lt EmailData gt       clsEmailData FirstName  JOhn   clsEmailData LastName   Smith   clsEmailData Location   Los Angeles   lstemail add clsEmailData

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You are attempting to call List lt EmailData  Add string string string   Try this   lstemail add new EmailData  FirstName  John   LastName  Smith   Location  Los Angeles

User · Answer

And if you want to create the list with some elements to start with   var emailList   new List lt EmailData gt       new EmailData   FirstName    John   LastName    Doe   Location    Moscow        new EmailData

User · Answer

You need to add an instance of the class   lstemail Add new EmailData   FirstName    John   LastName    Smith   Location    Los Angeles       I would recommend adding a constructor to your class  however   public class EmailData       public EmailData string firstName  string lastName  string location                this FirstName   firstName          this LastName   lastName          this Location   location            public string FirstName  set  get        public string LastName   set  get        public string Location  set  get        This would allow you to write the addition to your list using the constructor   lstemail Add new EmailData  John    Smith    Los Angeles

User · Answer

You need to create an instance of the class to add   lstemail Add new EmailData                                         FirstName    JOhn                        LastName    Smith                        Location    Los Angeles                         See How to  Initialize Objects by Using an Object Initializer  C  Programming Guide     Alternatively you could declare a constructor for you EmailData object and use that to create the instance

User · Answer

You need to new up an instance of EmailData and then add that   var data   new EmailData   FirstName    John   LastName    Smith   Location    LA      List lt EmailData gt  listemail   new List lt EmailData gt     listemail Add data     If you want to able to do   listemail Add  JOhn   Smith   Los Angeles      you can create your own custom list  by specializing System Collections Generic List and implementing your own Add method  more or less like this   public class EmailList   List lt EmailData gt        public void Add string firstName  string lastName  string location                var data   new EmailData                                               FirstName   firstName                          LastName   lastName                         Location   location                               this Add data

User · Answer

This line is your problem   lstemail Add  JOhn   Smith   Los Angeles      There is no direct cast from 3 strings to your custom class   The compiler has no way of figuring out what you re trying to do with this line   You need to Add   an instance of the class to lstemail   lstemail Add new EmailData   FirstName    JOhn   LastName    Smith   Location    Los Angeles

User · Answer

public IEnumerable lt CustInfo gt  SaveCustdata CustInfo cust                        try                               var customerinfo   new CustInfo                                       Name   cust Name                      AccountNo   cust AccountNo                      Address   cust Address                                    List lt CustInfo gt  custlist   new List lt CustInfo gt                     custlist Add customerinfo                   return custlist                            catch  Exception                                return null

[c#] Storing data into list with class

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