What is the get set syntax in C

Question

I am learning ASP NET MVC and I can read English documents  but I don t really understand what is happening in this code   public class Genre       public string Name   get  set        What does this mean    get  set

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Basically  it s a shortcut of   class Genre      private string genre      public string getGenre             return this genre            public void setGenre string theGenre            this genre   theGenre            In Main method genre g1   new Genre    g1 setGenre  Female    g1 getGenre      Female

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They are the accessors for the public property Name   You would use them to get set the value of that property in an instance of Genre

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Such   get  set    syntax is called automatic properties  C  3 0 syntax  You must use Visual C  2008   csc v3 5 or above to compile  But you can compile output that targets as low as  NET Framework 2 0  no runtime or classes required to support this feature

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This mean that if you create a variable of type Genre  you will be able to access the variable as a property  Genre oG   new Genre    oG Name    Test

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Those are automatic properties  Basically another way of writing a property with a backing field   public class Genre       private string  name       public string Name               get   gt   name        set   gt   name   value

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Its basically a shorthand  You can write public string Name   get  set    like in many examples  but you can also write it   private string  name   public string Name       get   return  name        set    name   value        value is a special keyword here     Why it is used  It can be used to filter access to a property  for example you  don t want names to include numbers   Let me give you an example   private class Person       private int  age      Person  age   25  will throw an error     public int Age          get   return  age        example  Console WriteLine Person Age           set                if   value  gt   0                     age   value        valid example  Person Age   25                      Officially its called Auto-Implemented Properties and its good habit to read the  programming guide    I would also recommend tutorial video C  Properties  Why use  get  and  set

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Its an auto-implemented property for C

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That is an Auto-Implemented Property  It s basically a shorthand way of creating properties for a class in C   without having to define private variables for them  They are normally used when no extra logic is required when getting or setting the value of a variable   You can read more on MSDN s Auto-Implemented Properties Programming Guide

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Get set are access modifiers to property  Get reads the property field  Set sets the property value  Get is like Read-only access  Set is like Write-only access  To use the property as read write both get and set must be used

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It is a shortcut to expose data members as public so that you don t need to explicitly create a private data members   C  will creates a private data member for you   You could just make your data members public without using this shortcut but then if you decided to change the implementation of the data member to have some logic then you would need to break the interface   So in short it is a shortcut to create more flexible code

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This is the short way of doing this   public class Genre       private string  name       public string Name             get   gt   name        set   gt   name   value

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So as I understand it   get  set    is an  auto property  which just like  Klaus and  Brandon said is shorthand for writing a property with a  backing field   So in this case   public class Genre       private string name     This is the backing field     public string Name      This is your property               get   gt  name          set   gt  name   value            However if you re like me - about an hour or so ago - you don t really understand what properties and accessors are  and you don t have the best understanding of some basic terminologies either  MSDN is a great tool for learning stuff like this but it s not always easy to understand for beginners  So I m gonna try to explain this more in-depth here   get and set are accessors  meaning they re able to access data and info in private fields  usually from a backing field  and usually do so from public properties  as you can see in the above example    There s no denying that the above statement is pretty confusing  so let s go into some examples  Let s say this code is referring to genres of music  So within the class Genre  we re going to want different genres of music  Let s say we want to have 3 genres  Hip Hop  Rock  and Country  To do this we would use the name of the Class to create new instances of that class   Genre g1   new Genre      Here we re creating a new instance of the class  Genre                            called g1  We ll create as many as we need  3  Genre g2   new Genre    Genre g3   new Genre       Note the    following new Genre  I believe that s essential since we re creating a   new instance of a class  Like I said  I m a beginner so I can t tell you exactly why   it s there but I do know it s essential    Now that we ve created the instances of the Genre class we can set the genre names using the  Name  property that was set way up above   public string Name   Again  this is the  Name  property   get  set      And this is the shorthand version the process we re doing right now    We can set the name of  g1  to Hip Hop by writing the following  g1 Name    Hip Hop     What s happening here is sort of complex  Like I said before  get and set access information from private fields that you otherwise wouldn t be able to access  get can only read information from that private field and return it  set can only write information in that private field  But by having a property with both get and set we re able do both of those functions  And by writing g1 Name    Hip Hop   we are specifically using the set function from our Name property  set uses an implicit variable called value  Basically what this means is any time you see  value  within set  it s referring to a variable  the  value  variable  When we write g1 Name   we re using the   to pass in the value variable which in this case is  Hip Hop   So you can essentially think of it like this   public class g1   We ve created an instance of the Genre Class called  g1        private string name      public string Name               get   gt  name          set   gt  name    Hip Hop     instead of  value    Hip Hop  is written because                                   value  in  g1  was set to  Hip Hop  by previously                                 writing  g1 Name    Hip Hop             It s Important to note that the above example isn t actually written in the code  It s more of a hypothetical code that represents what s going on in the background   So now that we ve set the Name of the g1 instance of Genre  I believe we can get the name by writing  console WriteLine  g1 Name     This uses the  get  function from our  Name  Property                                 and returns the field  name  which we just set to                                 Hip Hop    and if we ran this we would get  Hip Hop  in our console   So for the purpose of this explanation I ll complete the example with outputs as well  using System  public class Genre       public string Name   get  set       public class MainClass       public static void Main                 Genre g1   new Genre            Genre g2   new Genre            Genre g3   new Genre             g1 Name    Hip Hop           g2 Name    Rock           g3 Name    Country            Console WriteLine   Genres   0    1    2    g1 Name  g2 Name  g3 Name             Output    Genres  Hip Hop  Rock  Country

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Define the Private variables  Inside the Constructor  and load the data  I have created Constant and load the data from constant to Selected List class   public  class GridModel       private IEnumerable lt SelectList gt  selectList      private IEnumerable lt SelectList gt  Roles       public GridModel                 selectList   from PageSizes e in Enum GetValues typeof PageSizes                          select  new SelectList                                                       Id    int e                             Name   e ToString                                       Roles  from Userroles e in Enum GetValues typeof Userroles                  select  new SelectList                                       Id    int e                     Name   e ToString                               public IEnumerable lt SelectList gt  Pagesizelist   get   return this selectList    set   this selectList   value         public IEnumerable lt SelectList gt  RoleList   get   return this Roles    set   this Roles   value        public IEnumerable lt SelectList gt  StatusList   get  set

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It s a so-called auto property  and is essentially a shorthand for the following  similar code will be generated by the compiler    private string name  public string Name       get               return this name            set               this name   value

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The get set pattern provides a structure that allows logic to be added during the setting   set   or retrieval   get   of a property instance of an instantiated class  which can be useful when some instantiation logic is required for the property  A property can have a  get  accessor only  which is done in order to make that property read-only When implementing a get set pattern  an intermediate variable is used as a container into which a value can be placed and a value extracted  The intermediate variable is usually prefixed with an underscore  this intermediate variable is private in order to ensure that it can only be accessed via its get set calls  See the answer from Brandon  as his answer demonstrates the most commonly used syntax conventions for implementing get set

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In the Visual Studio  if you define a property X in a class and you want to use this class only as a type  after building your project you will get a warning that says  Field X is never assigned to  and will always has its default value    By adding a   get  set    to X property  you will not get this warning   In addition in Visual Studio 2013 and upper versions  by adding   get  set    you are able to see all references to that property

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Get is invoked when the property appears on the right-hand side  RHS  Set is invoked when the property appears on the left-hand side  LHS  of     symbol  For an auto-implemented property  the backing field works behind the scene and not visible    Example   public string Log   get  set      Whereas for a non auto-implemented property the backing field is upfront  visible as a private scoped variable   Example   private string log   public string Log       get   gt  log      set   gt  log   value      Also  it is worth noted here is the  getter  and  setter  can use the different  backing field

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A property is a like a layer that separates the private variable from other members of a class  From outside world it feels like a property is just a field  a property can be accessed using  Property  public class Person       public string FirstName   get  set         public string LastName   get  set         public string FullName   gt     FirstName   LastName       public class Person       public string FirstName   get  set         public string LastName   get  set         public string FullName   get   return    FirstName   LastName            FullName is a Property  The one with arrow is a shortcut  From outside world  we can access FullName like this   var person   new Person    Console WriteLine person FullName     Callers do not care about how you implemented the FullName  But inside the class you can change FullName whatever you want   Check out Microsoft Documentation for more detailed explanation   https   docs microsoft com en-us dotnet csharp properties

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