C#•2y ago

How to put enum values in a list [SOLVED]

Hi, I'm quite new to C# and I'm still learning, but I'm tasked to debug a piece of code using C#, I managed to fix it but I have like a super long if statement that contains the same thing, except for the values of enum. I came from Python and usually, I'd just declare a list like my_list = [1, 2], but from what I found, I just need to use Enum.GetValues().

3 Replies

CoreVisional•2y ago

the if statement looks something like

if (test.IsValid && item.ItemType != ItemType.FirstItem && item.File != null)

if (test.IsValid && item.ItemType != ItemType.FirstItem && item.File != null)

I need to validate for the second item as well, and my current solution makes it super redundant

if ((test.IsValid && item.ItemType != ItemType.FirstItem && item.File != null) && (test.IsValid && item.ItemType != ItemType.SecondItem&& item.File != null))

if ((test.IsValid && item.ItemType != ItemType.FirstItem && item.File != null) && (test.IsValid && item.ItemType != ItemType.SecondItem&& item.File != null))

So I'm wondering if there's a way for me to put ItemType.FirstItem and ItemType.SecondItem into like an array for the if statement to check

Kouhai•2y ago

You can use a ValueTuples like this

void Match(FirstEnum first, SecondEnum second)
{
    switch ((first, second))
    {
        case (FirstEnum.FirstItem, SecondEnum.Invalid):
            Console.WriteLine("First and invalid");
            break;
        case (FirstEnum.SecondItem, SecondEnum.Invalid):
            Console.WriteLine("Second and invalid");
            break;
        default:
            Console.WriteLine("Default");
            break;
    }

}

void Match(FirstEnum first, SecondEnum second)
{
    switch ((first, second))
    {
        case (FirstEnum.FirstItem, SecondEnum.Invalid):
            Console.WriteLine("First and invalid");
            break;
        case (FirstEnum.SecondItem, SecondEnum.Invalid):
            Console.WriteLine("Second and invalid");
            break;
        default:
            Console.WriteLine("Default");
            break;
    }

}

Or if you just want to return a value for each condition you can go with pattern matching

void Match(FirstEnum first, SecondEnum second)
{
    var str = (first, second) switch
    {
        (FirstEnum.FirstItem, SecondEnum.Invalid) => "First and invalid",
        (FirstEnum.SecondItem, SecondEnum.Invalid) => "Second and invalid",
        _ => null
    };

}

void Match(FirstEnum first, SecondEnum second)
{
    var str = (first, second) switch
    {
        (FirstEnum.FirstItem, SecondEnum.Invalid) => "First and invalid",
        (FirstEnum.SecondItem, SecondEnum.Invalid) => "Second and invalid",
        _ => null
    };

}

CoreVisional•2y ago

I'm actually working with ASP NET as well, my bad I forgot to put in the tag nor mention it. The code after the if statement is taken care of, though I can still refactor it. I'm just looking to perhaps shorten the if statement Welp, piping it doesn't work, I tried if (test.IsValid && item.ItemType != (ItemType.FirstItem | Itemtype.SecondItem) && item.File != null) Ohh I think I found the solution. I just use Enum.GetValues() and within my if statement, I just wrote if (!test.IsValid && item.ItemType.Equals(listOfItems) && item.File != null) It works lol Still, thank you for the help @Kouhai

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How to put enum values in a list [SOLVED]