C# - how to determine whether a Type is a number

Question

Is there a way to determine whether or not a given .Net Type is a number? For example: System.UInt32/UInt16/Double are all numbers. I want to avoid a long switc

Answer 1

Switch is a little slow, bacause every time methods in the worst situation will be go through all type. I think, using Dictonary is more nice, in this situation you will be have O(1):

public static class TypeExtensions
{
    private static readonly HashSet NumberTypes = new HashSet();

    static TypeExtensions()
    {
        NumberTypes.Add(typeof(byte));
        NumberTypes.Add(typeof(decimal));
        NumberTypes.Add(typeof(double));
        NumberTypes.Add(typeof(float));
        NumberTypes.Add(typeof(int));
        NumberTypes.Add(typeof(long));
        NumberTypes.Add(typeof(sbyte));
        NumberTypes.Add(typeof(short));
        NumberTypes.Add(typeof(uint));
        NumberTypes.Add(typeof(ulong));
        NumberTypes.Add(typeof(ushort));
    }

    public static bool IsNumber(this Type type)
    {
        return NumberTypes.Contains(type);
    }
}