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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 ?

c#

share|improve this question

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 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
  

  
  
  
  

add a comment | 

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 ?

c#

share|improve this question

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 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
  

  
  
  
  

add a comment | 

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

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 bronze badges

internal void setToken(string token)

 this.TOKEN = token; 

public class Client

 const TOKEN; 

 public client(string token)
 
 this.TOKEN = token;
 

share|improve this question

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 bronze badges

share|improve this question

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 bronze badges

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 bronze badges

asked Mar 26 at 10:03

Artistic AligatorArtistic Aligator

11011 silver badge1111 bronze badges

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

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 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
  

  
  
  
  

 | 
show 3 more comments

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

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

add a comment | 

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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

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 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
  

  
  
  
  

 | 
show 3 more comments

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

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 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
  

  
  
  
  

 | 
show 3 more comments

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

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 bronze badges

share|improve this answer

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 bronze badges

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 bronze badges

answered Mar 26 at 10:05

Gilad GreenGilad Green

31.2k55 gold badges3535 silver badges6060 bronze badges

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

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

add a comment | 

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

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

add a comment | 

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

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

public class Client

 private readonly string _token;

 public Client(string token)
 
 _token = token;
 

share|improve this answer

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges

answered Mar 26 at 10:05

StuartStuart

2,24511 gold badge1414 silver badges4141 bronze badges