Can I replace or put a new string on a empty array list index

Question

So I was wondering if there's a way to add a string to a null or empty index in array list. So the thing that I want is that if the array list index is null or empty then I want it to be replaced by another text.

string[] namelist = new string[4] { "dodo", "klee", "diluc", null };
for (int i = 0; i < namelist.Count(); i++)
{
    if (namelist[i] == null)
    {
        *Replace Null Text*
    }
    else
        Console.WriteLine("Taken");
}

Thanks.

Also, use namelist.Length rather than namelist.Count() -- it's slightly cheaper — canton7
– canton7, Commented Aug 5, 2021 at 10:42
Does this answer your question? How do I replace an item in a string array? — user12031933
– user12031933, Commented Aug 5, 2021 at 10:47
This question is basically: How to update arrays, which is a basic topic covered from all tutorials. — Tim Schmelter
– Tim Schmelter, Commented Aug 5, 2021 at 10:50
@canton7: it really does't matter whether you use Length or Count(). This method is called only once and it checks if the source implements ICollection<T> which is true for arrays, so it's using the arrays Count property (yes, arrays have it, it's simply using Length) instead of enumerating it. — Tim Schmelter
– Tim Schmelter, Commented Aug 5, 2021 at 10:59

ChrisBD · Accepted Answer · 2021-08-05 10:52:11Z

1

You're using an array and so Count() doesn't apply, but it would for a collection type like List.

    string[] namelist = new string[4] { "dodo", "klee", "diluc", null };
    for (int i = 0; i < namelist.Length; i++)
    {
        if (string.IsNullOrEmpty(namelist[i]))
        {
            namelist[i] = "filled";
        }
        else
            Console.WriteLine("Taken");
    }

answered Aug 5, 2021 at 10:52

ChrisBD

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1 Comment

canton7 Over a year ago

Enumerable.Count() works on arrays, as well as any other IEnumerable<T>. It's slightly less efficient here, but still works.

Enigmativity · Accepted Answer · 2021-08-05 11:35:22Z

-1

It's sometimes a good idea not to modify the array, but instead create a new one.

Here's the easy way:

namelist = namelist.Select(x => x ?? "*Replace Null Text*").ToArray();

answered Aug 5, 2021 at 11:35

Enigmativity

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