// default constructor, initializing required fields and loading the products list from the file.
public ProductsViewModel()
{
_ProductsList = new ObservableCollection<Product>();
_selectedItem = new Product();
_ProductPrice = 0.0;
loadFromXml();
addCmd = new RelayCommand(addNewItem, IsNotDirty);
deleteCmd = new RelayCommand(deleteItem, IsNotDirty);
closeCmd = new RelayCommand(closeApplication, IsNotDirty);
saveCmd = new RelayCommand(savelist, IsNotDirty);
UpdateCmd = new RelayCommand(UpdateSelected, IsNotDirty);
}
/// <summary>
/// getting user entered data, and making use of the view model to add the new product.
/// </summary>
private void addnewItem()
{
Product newProduct = new Product();
Console.WriteLine("enter the product name:");
newProduct.ProductName = Console.ReadLine();
Console.WriteLine("enter the price of the product:");
double productPrice;
bool continueLoop = true;
while (continueLoop)
{
string stringEntered = Console.ReadLine();
switch (stringEntered)
{
case "back":
{
continueLoop = false;
newProduct = null;
}
break;
default:
if (double.TryParse(stringEntered, out productPrice))
{
newProduct.ProductPrice = productPrice;
continueLoop = false;
}
else
{
Console.WriteLine("enter numeric value for price");
Console.WriteLine("back: go back without adding");
}
break;
}
}
if(newProduct != null)
{
VM_Obj.ProductsList.Add(newProduct);
}
}
/// <summary>
/// create a new products object and add it to the productsList.
/// </summary>
/// <param name="obj"></param>
private void addNewItem(object obj)
{
Product newItem = new Product(_newProductName, _newPriceValue);
//newItem.IsDirty = true;
_ProductsList.Add(newItem);
selectedItem = newItem;
newProductName = String.Empty;
newPriceValue = 0;
}
/// <summary>
/// update an existing product item.
/// </summary>
/// <param name="obj"></param>
public void UpdateSelected(object obj)
{
IsDirty = true;
ProductsList.Remove(selectedItem);
Product newItem = new Product(selectedItem.ProductName, selectedItem.ProductPrice);
if (_IsValue)
{
newItem.ProductPrice = currentValue;
}
else if (_IsPercentage)
{
newItem.ProductPrice = newItem.UpdateByPercentage(currentValue);
}
// little bit work around for making the observable collection to refresh on the list view.
// if found a better solution to do this, shouls update this method accordingly.
ProductsList.Add(newItem);
selectedItem = newItem;
IsDirty = false;
IsValue = false;
IsPercentage = false;
currentValue = 0.0;
}
