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 switch-case on the `Type.FullName`.

Accepted Answer

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
```

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

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