C# converting a decimal to an int safely

Question

I am trying to convert a decimal to an integer safely.

Something like

public static bool Decimal.TryConvertToInt32(decimal val, out int val)

this will return false if it cannot convert to an integer, and true w/ successful output if it can.

This is to avoid catching the OverflowException in decimal.ToInt32 method. What is the easiest way to do this?

Answer 1

I would write an extension method for class decimal like this:

public static class Extensions
{
    public static bool TryConvertToInt32(this decimal decimalValue, out int intValue)
    {
        intValue = 0;
        if ((decimalValue >= int.MinValue) && (decimalValue <= int.MaxValue))
        {
            intValue = Convert.ToInt32(decimalValue);
            return true;
        }
        return false;
    }
}

You can use it in that way:

if (decimalNumber.TryConvertToInt32(out intValue))
{
    Debug.WriteLine(intValue.ToString());
}

Answer 2

Here:

public static bool TryConvertToInt32(decimal val, out int intval)
{
    if (val > int.MaxValue || val < int.MinValue)
    {
      intval = 0; // assignment required for out parameter
      return false;
    }

    intval = Decimal.ToInt32(val);

    return true;
}

Answer 3

Compare the decimal against int.MinValue and int.MaxValue prior to the conversion.