CODEWITHSUNDEEP
c#.netvb.netwinformsclass
HotTester
HotTester

Reputation: 5768

how to assign value to readonly static field

I have a field which is static and readonly. The requirement is that the value should be allocated to the field at the login time and after that it should be readonly. How can i achieve this ?

  public static class Constant
    {
        public static readonly string name;                

    }

Kindly guide.

Upvotes: 2

Views: 3033

Answers (5)

Reza ArabQaeni
Reza ArabQaeni

Reputation: 4907

public static class Constant
{
    public static string Name
    {
        get
        {
            return name;
        }
        set
        {
            if (name == null)
                name = value;
            else
                throw new Exception("...");
        }
    }
    private static string name;
}

Upvotes: 1

John Gathogo
John Gathogo

Reputation: 4655

You can also create a static constructor in your static class

static Constant()
{
    name = "Name";
}

Upvotes: 0

Dominik
Dominik

Reputation: 3362

If you declare a readonly field you can only set it in the constructor of the class. What you could do is implementing a property only having a getter and exposing a change method that is used during your logon sequence to modify the value. Other Parts of your program can use the property effectivly not allowing them to change the value.

Upvotes: 3

Yaur
Yaur

Reputation: 7452

you need a static constructor

public static class Constant
{
    public static readonly string name;

    static Constant()
    {
        name = "abc";
    }
}

Upvotes: 1

Fischermaen
Fischermaen

Reputation: 12458

Just assign the value in the declaration (or constructor) like this:

public static class Constant     
{
    public static readonly string name = "MyName";
}

readonly is sugar for the compiler, telling him, that you don't intend to change the value outside the constructor. If you do so, he will generate an error.

Upvotes: 0

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