Helper class to achieve common task

Question

I would like to create a helper class to do some common task.

For example, I am retrieving some results from Database and then assigning the values to variables. Bu

Answer 1

Well what you are trying to acchieve is to avoid the NullReferenceException i guess.

You could achieve this by writing a generic method like this

public static TValue GetValueSafe(TObject obj, Func accessor)
{
    if(obj== null)
        return default(TValue);

    return accessor(obj);
}

Then use it like this:

string strValue = Helpers.GetValueSafe(dr[colName], o => o.toString());

This would either return the value of toString, or if dr[colName] == null returns default(string) which is null.

You could exand this by adding a defaultParameter to define a value on "failure".

However i would'nt recommend using this.