CODEWITHSUNDEEP
c#stringnull
Edouard Frechette
Edouard Frechette

Reputation: 1

How to change a null string to default

For a project I need to change a string affected to null or a white space to default. In my head this code makes sense but what am I missing? It just return a whitespace like it hasnt changed at all. I'm new to programming and I'm looking for help. Thank you :).

static void Main(string[] args)
    {
        string s = "";
        ValidateString(s);
        Console.WriteLine(s);

    }
    static string ValidateString(string s)
    {
        if (s == null || String.IsNullOrWhiteSpace(s))
            s = "défault";
        return s;
    }

Upvotes: 0

Views: 294

Answers (2)

Daniel Hernandez
Daniel Hernandez

Reputation: 42

s not change because you ignore the return value of the ValidateString method, change your code like below:

s= ValidateString(s);

and the ValidateString can imporved like this:

static string ValidateString(string s)
{
    return string.IsNullOrWhiteSpace(s) ? "défault" : s;
}

Upvotes: -1

David
David

Reputation: 218828

You're returning the value from the method, but you're not capturing that return value. Update the variable with the returned value:

string s = "";
s = ValidateString(s); // <--- here
Console.WriteLine(s);

Or, more simply:

Console.WriteLine(ValidateString(""));

Your method itself could also be simplified to:

return string.IsNullOrWhiteSpace(s) ? "défault" : s;

Upvotes: 6

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