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

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Try this:

Type type = object.GetType();
bool isNumber = (type.IsPrimitiveImple && type != typeof(bool) && type != typeof(char));

The primitive types are Boolean, Byte,
SByte, Int16, UInt16, Int32, UInt32,
Int64, UInt64, Char, Double,and
Single.

Taking Guillaume’s solution a little further:

public static bool IsNumericType(this object o)
{   
  switch (Type.GetTypeCode(o.GetType()))
  {
    case TypeCode.Byte:
    case TypeCode.SByte:
    case TypeCode.UInt16:
    case TypeCode.UInt32:
    case TypeCode.UInt64:
    case TypeCode.Int16:
    case TypeCode.Int32:
    case TypeCode.Int64:
    case TypeCode.Decimal:
    case TypeCode.Double:
    case TypeCode.Single:
      return true;
    default:
      return false;
  }
}

Usage:

int i = 32;
i.IsNumericType(); // True

string s = "Hello World";
s.IsNumericType(); // False

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