Question

    public static IDictionary<TKey, TVal> Insert(this IDictionary<TKey, TVal> dict, TKey key, TVal value)
    {
        dict.Add(key, value);
        return dict;
    }

I get my favorite red squiggly line under the TKey and TVal with the “Type or namespace cannot be found” error. As placeholders for types, I wouldn’t think this would happen… where am I screwing up?

Answer 1

You need to specify the type parameters to the method as well:

 public static IDictionary<TKey, TVal> Insert<TKey, TVal>(this IDictionary<TKey, TVal> dict, TKey key, TVal value)

to make it a generic method.