CloudMusic/FNZCM/FNZCM.BlazorWasm/Helpers/ExtenstionMetohd.cs

namespace FNZCM.BlazorWasm.Helpers
{
    public static class ExtenstionMetohd
    {
        public static IEnumerable<(T item, int index)> WithIndex<T>(this IEnumerable<T> self)
            => self.Select((item, index) => (item, index));

        public static TV GetEx<TK, TV>(this IDictionary<TK, TV> dic, TK key)
        {
            if (key == null) return default;
            return dic.TryGetValue(key, out var tv)
                ? tv
                : default;
        }

        public static T[] KeepNoEmpty<T>(this T[] source)
        {
            if (false == (source?.Length > 0)) return new T[1];
            return source;
        }
    }
}