private void Products_CurrentItemChanged(ProductNotifyGeneric oldProduct, ProductNotifyGeneric newProduct)
{
if (newProduct != null)
{
newProduct.PropertyChanged += Product_PropertyChanged;
}
if (oldProduct != null)
{
oldProduct.PropertyChanged -= Product_PropertyChanged;
}
}
private void ValidateUniqueName(ProductNotifyGeneric product)
{
string errorMessage = "The product name must be unique.";
if (!IsProductNameUnique(product))
{
product.ExternalErrors.Add(errorMessage);
}
else
{
product.ExternalErrors.Remove(errorMessage);
}
}
private bool IsProductNameUnique(ProductNotifyGeneric product) => Products.Count(p => p.Id != product.Id && p.Name != string.Empty && p.Name == product.Name) == 0;
