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Is it possible to assign a value to a const Variable when creating an Object?


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1















I am creating a Client for a WebRequestTool which contains a Token that is used throughout the lifetime of each Object but is unique to each entity of the class. Since I do not want that value to be changeable after an Object is created, I would like it to be Constant.



I already tried using an internal SetMethod which is called from the constructor like :



internal void setToken(string token)

this.TOKEN = token;



I also tried just assigning it inside the constructor. That is also not working.



public class Client

const TOKEN;

public client(string token)

this.TOKEN = token;




Is there really no other way of assigning a constant than hardcoding it when declaring it? And if there is what is it ?










share|improve this question

















  • 2





    How about using readonly?

    – Patrick
    Mar 26 at 10:04












  • Oh. I didn't know about that since I'm pretty new to this.

    – Artistic Aligator
    Mar 26 at 10:05

















1















I am creating a Client for a WebRequestTool which contains a Token that is used throughout the lifetime of each Object but is unique to each entity of the class. Since I do not want that value to be changeable after an Object is created, I would like it to be Constant.



I already tried using an internal SetMethod which is called from the constructor like :



internal void setToken(string token)

this.TOKEN = token;



I also tried just assigning it inside the constructor. That is also not working.



public class Client

const TOKEN;

public client(string token)

this.TOKEN = token;




Is there really no other way of assigning a constant than hardcoding it when declaring it? And if there is what is it ?










share|improve this question

















  • 2





    How about using readonly?

    – Patrick
    Mar 26 at 10:04












  • Oh. I didn't know about that since I'm pretty new to this.

    – Artistic Aligator
    Mar 26 at 10:05













1












1








1








I am creating a Client for a WebRequestTool which contains a Token that is used throughout the lifetime of each Object but is unique to each entity of the class. Since I do not want that value to be changeable after an Object is created, I would like it to be Constant.



I already tried using an internal SetMethod which is called from the constructor like :



internal void setToken(string token)

this.TOKEN = token;



I also tried just assigning it inside the constructor. That is also not working.



public class Client

const TOKEN;

public client(string token)

this.TOKEN = token;




Is there really no other way of assigning a constant than hardcoding it when declaring it? And if there is what is it ?










share|improve this question














I am creating a Client for a WebRequestTool which contains a Token that is used throughout the lifetime of each Object but is unique to each entity of the class. Since I do not want that value to be changeable after an Object is created, I would like it to be Constant.



I already tried using an internal SetMethod which is called from the constructor like :



internal void setToken(string token)

this.TOKEN = token;



I also tried just assigning it inside the constructor. That is also not working.



public class Client

const TOKEN;

public client(string token)

this.TOKEN = token;




Is there really no other way of assigning a constant than hardcoding it when declaring it? And if there is what is it ?







c#






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 26 at 10:03









Artistic AligatorArtistic Aligator

1101 silver badge11 bronze badges




1101 silver badge11 bronze badges







  • 2





    How about using readonly?

    – Patrick
    Mar 26 at 10:04












  • Oh. I didn't know about that since I'm pretty new to this.

    – Artistic Aligator
    Mar 26 at 10:05












  • 2





    How about using readonly?

    – Patrick
    Mar 26 at 10:04












  • Oh. I didn't know about that since I'm pretty new to this.

    – Artistic Aligator
    Mar 26 at 10:05







2




2





How about using readonly?

– Patrick
Mar 26 at 10:04






How about using readonly?

– Patrick
Mar 26 at 10:04














Oh. I didn't know about that since I'm pretty new to this.

– Artistic Aligator
Mar 26 at 10:05





Oh. I didn't know about that since I'm pretty new to this.

– Artistic Aligator
Mar 26 at 10:05












2 Answers
2






active

oldest

votes


















2














From documentation:




A const field can only be initialized at the declaration of the field




You might want to use readonly instead:




A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used




Another nice resource: Difference between readonly and const keyword in C#






share|improve this answer























  • Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

    – Artistic Aligator
    Mar 26 at 10:10











  • @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

    – Gilad Green
    Mar 26 at 10:13











  • No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

    – Artistic Aligator
    Mar 26 at 10:15






  • 1





    @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

    – Gilad Green
    Mar 26 at 10:20






  • 1





    @ArtisticAligator - you are welcome :)

    – Gilad Green
    Mar 26 at 10:45


















1














You can insted declare it private readonly



public class Client

private readonly string _token;

public Client(string token)

_token = token;




Readonly fields can't be modified once they are set and can be set in the constructor.






share|improve this answer

























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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    2














    From documentation:




    A const field can only be initialized at the declaration of the field




    You might want to use readonly instead:




    A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used




    Another nice resource: Difference between readonly and const keyword in C#






    share|improve this answer























    • Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

      – Artistic Aligator
      Mar 26 at 10:10











    • @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

      – Gilad Green
      Mar 26 at 10:13











    • No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

      – Artistic Aligator
      Mar 26 at 10:15






    • 1





      @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

      – Gilad Green
      Mar 26 at 10:20






    • 1





      @ArtisticAligator - you are welcome :)

      – Gilad Green
      Mar 26 at 10:45















    2














    From documentation:




    A const field can only be initialized at the declaration of the field




    You might want to use readonly instead:




    A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used




    Another nice resource: Difference between readonly and const keyword in C#






    share|improve this answer























    • Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

      – Artistic Aligator
      Mar 26 at 10:10











    • @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

      – Gilad Green
      Mar 26 at 10:13











    • No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

      – Artistic Aligator
      Mar 26 at 10:15






    • 1





      @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

      – Gilad Green
      Mar 26 at 10:20






    • 1





      @ArtisticAligator - you are welcome :)

      – Gilad Green
      Mar 26 at 10:45













    2












    2








    2







    From documentation:




    A const field can only be initialized at the declaration of the field




    You might want to use readonly instead:




    A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used




    Another nice resource: Difference between readonly and const keyword in C#






    share|improve this answer













    From documentation:




    A const field can only be initialized at the declaration of the field




    You might want to use readonly instead:




    A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used




    Another nice resource: Difference between readonly and const keyword in C#







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Mar 26 at 10:05









    Gilad GreenGilad Green

    31.2k5 gold badges35 silver badges60 bronze badges




    31.2k5 gold badges35 silver badges60 bronze badges












    • Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

      – Artistic Aligator
      Mar 26 at 10:10











    • @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

      – Gilad Green
      Mar 26 at 10:13











    • No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

      – Artistic Aligator
      Mar 26 at 10:15






    • 1





      @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

      – Gilad Green
      Mar 26 at 10:20






    • 1





      @ArtisticAligator - you are welcome :)

      – Gilad Green
      Mar 26 at 10:45

















    • Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

      – Artistic Aligator
      Mar 26 at 10:10











    • @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

      – Gilad Green
      Mar 26 at 10:13











    • No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

      – Artistic Aligator
      Mar 26 at 10:15






    • 1





      @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

      – Gilad Green
      Mar 26 at 10:20






    • 1





      @ArtisticAligator - you are welcome :)

      – Gilad Green
      Mar 26 at 10:45
















    Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

    – Artistic Aligator
    Mar 26 at 10:10





    Is there a way to do all that from a Set Function? Since readonly also seems to only be writable from the constructor.

    – Artistic Aligator
    Mar 26 at 10:10













    @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

    – Gilad Green
    Mar 26 at 10:13





    @ArtisticAligator - like from a setter? Is your case that you do not know when you want to initialize it but that you want only once?

    – Gilad Green
    Mar 26 at 10:13













    No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

    – Artistic Aligator
    Mar 26 at 10:15





    No that would not be because of the time I want to set it but because of keeping the size of the constructor comprehensible.

    – Artistic Aligator
    Mar 26 at 10:15




    1




    1





    @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

    – Gilad Green
    Mar 26 at 10:20





    @ArtisticAligator - if it is big it is probably doing too much. Think if you could use multiple ctors where one calls another. If not then you could also create some private functions and call them from the ctor. Still I'd say that if the ctor is doing so much it is probably doing stuff it shouldn't

    – Gilad Green
    Mar 26 at 10:20




    1




    1





    @ArtisticAligator - you are welcome :)

    – Gilad Green
    Mar 26 at 10:45





    @ArtisticAligator - you are welcome :)

    – Gilad Green
    Mar 26 at 10:45













    1














    You can insted declare it private readonly



    public class Client

    private readonly string _token;

    public Client(string token)

    _token = token;




    Readonly fields can't be modified once they are set and can be set in the constructor.






    share|improve this answer



























      1














      You can insted declare it private readonly



      public class Client

      private readonly string _token;

      public Client(string token)

      _token = token;




      Readonly fields can't be modified once they are set and can be set in the constructor.






      share|improve this answer

























        1












        1








        1







        You can insted declare it private readonly



        public class Client

        private readonly string _token;

        public Client(string token)

        _token = token;




        Readonly fields can't be modified once they are set and can be set in the constructor.






        share|improve this answer













        You can insted declare it private readonly



        public class Client

        private readonly string _token;

        public Client(string token)

        _token = token;




        Readonly fields can't be modified once they are set and can be set in the constructor.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Mar 26 at 10:05









        StuartStuart

        2,2451 gold badge14 silver badges41 bronze badges




        2,2451 gold badge14 silver badges41 bronze badges



























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