I'd like to check if an object is a number so that .ToString()
would result in a string containing digits and +
,-
,.
Is it possible by simple type checking in .net (like: if (p is Number)
)?
Or Should I convert to string, then try parsing to double?
Update: To clarify my object is int, uint, float, double, and so on it isn't a string. I'm trying to make a function that would serialize any object to xml like this:
<string>content</string>
or
<numeric>123.3</numeric>
or raise an exception.
You will simply need to do a type check for each of the basic numeric types.
Here's an extension method that should do the job:
public static bool IsNumber(this object value)
{
return value is sbyte
|| value is byte
|| value is short
|| value is ushort
|| value is int
|| value is uint
|| value is long
|| value is ulong
|| value is float
|| value is double
|| value is decimal;
}
This should cover all numeric types.
It seems you do actually want to parse the number from a string during deserialisation. In this case, it would probably just be best to use double.TryParse
.
string value = "123.3";
double num;
if (!double.TryParse(value, out num))
throw new InvalidOperationException("Value is not a number.");
Of course, this wouldn't handle very large integers/long decimals, but if that is the case you just need to add additional calls to long.TryParse
/ decimal.TryParse
/ whatever else.