Getter and Setter declaration in NET

Question

I was wondering what were the differences between those declaration of getters and setters and if there is a preferred method  and why   The first one can be generated automaticly by Visual Studio  How about the others   Thanks  1st  string  myProperty   get  set      2nd  string  myProperty   public string myProperty       get   return  myProperty        set    myProperty   value        3rd  string  myProperty   public string getMyProperty       return this  myProperty     public void setMyProperty string value      this  myProperty   value

User · Answer

Just to clarify  in your 3rd example  myProperty isn t actually a property  It s a field with get and set methods  and as has already been mentioned the get and set methods should specify return types    In C  the 3rd method should be avoided in most situations  You d only really use it if the type you wanted to return was an array  or if the get method did a lot of work rather than just returning a value  The latter isn t really necessary but for the purpose of clarity a property s get method that does a lot of work is misleading

User · Answer

Properties are used to encapsulate some data  You could use a plain field   public string MyField   But this field can be accessed by all outside users of your class  People can insert illegal values or change the value in ways you didn t expect   By using a property  you can encapsulate the way your data is accessed  C  has a nice syntax for turning a field into a property   string MyProperty   get  set      This is called an auto-implemented property  When the need arises you can expand your property to   string  myProperty   public string MyProperty       get   return  myProperty        set    myProperty   value        Now you can add code that validates the value in your setter   set       if  string IsNullOrWhiteSpace value           throw new ArgumentNullException          myProperty   value      Properties can also have different accessors for the getter and the setter   public string MyProperty   get  private set      This way you create a property that can be read by everyone but can only be modified by the class itself   You can also add a completely custom implementation for your getter   public string MyProperty       get               return DateTime Now Second ToString              When C  compiles your auto-implemented property  it generates Intermediate Language  IL   In your IL you will see a get MyProperty and set MyProperty method  It also creates a backing field called  lt MyProperty gt k BackingField  normally this would be an illegal name in C  but in IL it s valid  This way you won t get any conflicts between generated types and your own code   However  you should use the official property syntax in C   This creates a nicer experience in C   for example with IntelliSense    By convention  you shouldn t use properties for operations that take a long time

User · Answer

The  1st one is default  when there is nothing special to return or write  2nd and 3rd are basically the same where 3rd is a bit more expanded version of 2nd

User · Answer

1st  string  myProperty   get  set      This is called an Auto Property in the  NET world  It s just syntactic sugar for  2   2nd  string  myProperty   public string myProperty       get   return  myProperty        set    myProperty   value        This is the usual way to do it  which is required if you need to do any validation or extra code in your property  For example  in WPF if you need to fire a Property Changed Event  If you don t  just use the auto property  it s pretty much standard   3  string  myProperty   public string getMyProperty         return this  myProperty     public string setMyProperty string value        this  myProperty   value      The this keyword here is redundant  Not needed at all  These are just Methods that get and set as opposed to properties  like the Java way of doing things

User · Answer

With this  you can perform some code in the get or set scope  private string  myProperty  public string myProperty       get   return  myProperty        set    myProperty   value       You also can use automatic properties  public string myProperty       get      set     And  Net Framework will manage for you  It was create because it is a good pratice and make it easy to do  You also can control the visibility of these scopes  for sample  public string myProperty       get      private set     public string myProperty2       get      protected set     public string myProperty3       get      Update Now in C  you can initialize the value of a property  For sample  public int Property   get  set      1   If also can define it and make it readonly  without a set  public int Property   get      1   And finally  you can define an arrow function  public int Property   gt  GetValue

User · Answer

Lets start with 3  That wouldnt work  public getMyProperty   has no return typ   And number 1 and 2 are actually same things  2 is what number 1 becomes after compilation   So 1 and 2 are same things  with two you can have some validation or caching in your model   other than that they become same

User · Answer

Well  the first and second both generate something like the third in the end  However  don t use the third when you have a syntax for properties   Finally  if you have no work to do in the get or set  then use the first   In the end  the first and second are just some form of syntactic sugar  but why code more than what s necessary      more code    more bugs   And just to have a little fun  consider this   public string A   get  private set      Now that s a lot more straight forward isn t it  The public modifier is implied on both the get and the set  but it can be overriden  This would of course be the same rule for any modifier used when defining the property itself

User · Answer

The first one is the  short  form - you use it  when you do not want to do something fancy with your getters and setters  It is not possible to execute a method or something like that in this form   The second and third form are almost identical  albeit the second one is compressed to one line  This form is discouraged by stylecop because it looks somewhat weird and does not conform to C  Stylguides   I would use the third form if I expectd to use my getters   setters for something special  e g  use a lazy construct or so

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