string to char in c#

Question

i have a class where i am assigning currency variable as follows:

example currency formats USD,EUR etc etc

public class codes{
  public char currency{get;set;}
}

so i have another class that calls codes to assign it into the currency variable as follows:

public async Task<Codes> ExecuteAsync(hCommand command){
Codes c = new Codes();
//i do some coding to get the currency back then i assign it as follows from a string
 c.currency = Convert.ToChar(currency);
}

but it throws an error at that line System.FormatException: 'String must be exactly one character long.' and the output is returned as "currency": "\u0000"

how can i get it to be a char(3)

why not this: public string currency { get; set; }? since you want value like USD or EUR — Giacomo Pirinoli
– Giacomo Pirinoli, Commented Mar 20, 2020 at 11:59
no i cant use it as a string which it currently is because the requested end point requires it as a char character — josh
– josh, Commented Mar 20, 2020 at 12:10
Where is that currency variable comming from? What is it set to? Why is it a string, if you plan to assign it to a char? Why not use a Enumeration? — Christopher
– Christopher, Commented Mar 20, 2020 at 12:24
C# does not have char(3) as you call it. You can use string, or you can create your own type Currency that holds a string which is assured to have the right format (like, not too long). — Jeppe Stig Nielsen
– Jeppe Stig Nielsen, Commented Mar 20, 2020 at 13:11

Emiliano Javier González · Accepted Answer · 2020-03-20 12:01:07Z

1

I think that if you want to store something like a currency, "USD" for example, string is the correct type to do so, not char. Char stores a single character.

In any case, if you still want to use char, you should, for this particular case, use an array of chars:

public class codes{
    public char[] currency { get; set; }
}

And then use ToCharArray instead:

c.currency = Convert.ToCharArray();

answered Mar 20, 2020 at 12:01

Emiliano Javier González

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Comments

Pavel Anikhouski · Accepted Answer · 2020-03-23 07:18:55Z

You can declare your class like

public class Сodes
{
    public string Сurrency { get; set; }
}

and use in the following way

Codes c = new Codes();
c.Сurrency = currency;

String in C# represents a readonly sequence of char elements, you can't assign string like "USD" to a single character.

Another option is to use a char array for that, like

public class Сodes
{
    public char[] Сurrency { get; set; }
}

and use ToCharArray to assign a value

Codes c = new Codes();
c.Сurrency = currency.ToCharArray();

It's a good rule to use a PascalCase for classes and properties names (btw, you codes class declaration doesn't match the usage example Codes).

You can also refer to this question 3 Digit currency code to currency symbol, if want to convert currency code to currency symbol, like $

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