Question

I have a dictionary declared like this.

public static Dictionary<int?, List<int?>> pegMap = new Dictionary<int?, List<int?>>();

Now I’m trying to check a whether the list inside the dictionary contains some value where dictionary key is some value.

if (pegMap.Select(y => y.Value.Contains(disc)).Where(x => x.Equals(key)))
{
    peg = (int)key;
}

But the compiler is angry and throwing me an error like so –

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<bool>' to 'bool'

What am I doing wrong here. Please help.

Answer 1

It sounds like you’re completely ignoring the fact that you’re using a dictionary. It sounds like you might want:

public bool CheckMap(int? key, int? checkValue)
{
    List<int?> values;
    if (!pegMap.TryGetValue(key, out values))
    {
        return false;
    }
    return values.Contains(checkValue);
}