How to fix 'Cannot implicitly convert type' error in C#?

Question

I am doing the flare-on challenge (Memecat Battlestation) and I've decided to.. Well bypass it, the Demo Shareware one got bypassed, but corrupted flag so I thought I'd try the full version, I tried the full version but I've gotten an error

This is for the 1st Flare-On challenge named Memecat Battlestation, I am running Windows 7 64-bit, the error is in VictoryForm.cs

    private static IEnumerable<byte> AssignFelineDesignation(byte[] cat, IEnumerable<byte> data)
    {
        byte[] s = BattleCatManagerInstance.InvertCosmicConstants(cat);
        int i = 0;
        int j = 0;
        return data.Select(delegate (byte b)
        {
            i = (i + 1 & 255);
            j = (j + (int)s[i] & 255);
            BattleCatManagerInstance.CatFact(s, i, j);
            return b ^ s[(int)(s[i] + s[j] & byte.MaxValue)];
        });
    }

I've expected it to just build without any errors but I've gotten this error:

'Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<int>' to 'System.Collections.Generic.IEnumerable<byte>'. An explicit conversion exists (are you missing a cast?)'

Jon Skeet · Accepted Answer · 2019-08-19 11:22:55Z

10

This line:

return b ^ s[(int)(s[i] + s[j] & byte.MaxValue)]

... returns an int, because that's the type of the ^ operator you're using. You can just cast the result to byte:

return (byte) (b ^ s[(int)(s[i] + s[j] & byte.MaxValue)]);

I'd personally use a lambda expression rather than an anonymous method though:

return data.Select(b =>
{
    i = (i + 1 & 255);
    j = (j + (int)s[i] & 255);
    BattleCatManagerInstance.CatFact(s, i, j);
    return (byte) (b ^ s[(int)(s[i] + s[j] & byte.MaxValue)]);
});

edited Aug 19, 2019 at 11:22

answered Aug 19, 2019 at 11:16

Jon Skeet

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3 Comments

ilkerkaran Over a year ago

you mean "the statement returns an int" right? Or am i missing something?

Jon Skeet Over a year ago

@ilkerkaran: Doh! That's absolutely what I meant. Thanks for spotting it :)

user10147823 Over a year ago

I'll flag this as the best answer once the 6 minutes is over, this actually helped me. Thanks, I just have to find a way to fix 'Resource identifier 'MemeCatBattlestation.VictoryForm.resources' has already been used in this assembly' now.

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