Parser for signed overpunch values?

Question

I am working with some old data imports and came across a bunch of data from an external source that reports financial numbers with a signed overpunch. I\'ve seen alot, but

Answer 1

If you don't have enough already here is another option using an extension method, you could make this better by using some of the ideas in the other posts.

/// 

/// Extension method to get overpunch value
/// 
/// the text to convert
/// int
public static int OverpunchValue(this String number)
{
    int returnValue;

    var ovpValue = OverPunchValues.Instance.OverPunchValueCollection.First(o => o.OverpunchCharacter ==
        Convert.ToChar(number.Substring(number.Length - 1)));

    returnValue = Convert.ToInt32(number.Substring(0, number.Length - 1) + ovpValue.NumericalValue.ToString());

    return ovpValue.IsNegative ? returnValue * -1 : returnValue;
}

/*singleton to store values */
public class OverPunchValues
{
    public List OverPunchValueCollection { get; set; }

    private OverPunchValues()
    {
        OverPunchValueCollection = new List();
        OverPunchValueCollection.Add(new OverPunchValue { OverpunchCharacter = '{', IsNegative = true, NumericalValue = 0 });
        OverPunchValueCollection.Add(new OverPunchValue { OverpunchCharacter = 'J', IsNegative = true, NumericalValue = 1 });
        //add the rest of the values here...
    }

    static readonly OverPunchValues _instance = new OverPunchValues();

    public static OverPunchValues Instance
    {
        get { return _instance; }
    }
}

public class OverPunchValue
{
    public char OverpunchCharacter { get; set; }
    public bool IsNegative { get; set; }
    public int NumericalValue { get; set; }

    public OverPunchValue()
    {

    }            
}

And then you can call it like:

string str = "00345{";

int temp = str.OverpunchValue();