// This method was added in the interest of DRY and is used by MdcSelect & PMdcRadioButtonGroup
public T ValidateItemList(
IEnumerable <MdcListElement <T> > items,
MdcItemValidation appliedItemValidation)
{
var componentName = (new Regex("^[a-z,A-Z]*")).Match(GetType().Name).ToString();
if (items.Count() == 0)
{
throw new ArgumentException(componentName + " requires a non-empty Items parameter.");
}
if (items.GroupBy(i => i.SelectedValue).Where(g => g.Count() > 1).Count() > 0)
{
throw new ArgumentException(componentName + " has multiple enties in the List with the same SelectedValue");
}
if (items.Where(i => object.Equals(i.SelectedValue, UnderlyingValue)).Count() == 0)
{
switch (appliedItemValidation)
{
case MdcItemValidation.DefaultToFirst:
var firstOrDefault = items.FirstOrDefault().SelectedValue;
return(firstOrDefault);
case MdcItemValidation.Exception:
string itemList = "{ ";
string prepend = "";
foreach (var item in items)
{
itemList += $"{prepend} '{item.SelectedValue}'";
prepend = ",";
}
itemList += " }";
throw new ArgumentException(componentName + $" cannot select item with data value of '{UnderlyingValue?.ToString()}' from {itemList}");
case MdcItemValidation.NoSelection:
return(default);
}
}
return(UnderlyingValue);
}
public override string ToString()
{
return(string.Format("({0}, {1})", UnderlyingValue.ToString("N4"), DerivedValue.ToString("N4")));
}