private object Convert(object value)
{
foreach (ObjectLookupItemBase LookupItem in this.LookupItems)
{
if (LookupItem is ObjectLookupOtherwiseItem)
{
return(LookupItem.Value);
}
else if (LookupItem is ObjectLookupItem)
{
ObjectLookupItem Item = (ObjectLookupItem)LookupItem;
Type KeyType = Item.Key?.GetType();
Type ValueType = value?.GetType();
if (KeyType == ValueType)
{
if (object.Equals(Item.Key, value))
{
return(LookupItem.Value);
}
}
else
{
if (object.Equals(Item.Key?.ToString(), value?.ToString()))
{
return(LookupItem.Value);
}
//TODO: implement dynamic casting; it's hard here because TypeDescriptor infrastructure is not available
}
}
else
{
throw new InvalidOperationException("Unknown lookup item type");
}
}
//Not found - Fallback: return unconverted value
return(value);
}
private object ConvertBack(object value)
{
foreach (ObjectLookupItemBase LookupItem in this.LookupItems)
{
if (LookupItem is ObjectLookupOtherwiseItem)
{
return(null);
}
else if (LookupItem is ObjectLookupItem)
{
ObjectLookupItem Item = (ObjectLookupItem)LookupItem;
Type DestinationType = Item.Value?.GetType();
Type ValueType = value?.GetType();
if (DestinationType == ValueType)
{
if (object.Equals(Item.Value, value))
{
return(Item.Key);
}
}
else
{
throw new NotImplementedException("TODO"); //TODO: implement dynamic casting
}
}
else
{
throw new InvalidOperationException("Unknown lookup item type");
}
}
//Not found - Fallback: return unconverted value
return(value);
}
