/// <summary>
/// Add new product object to the DataServiceContext, and associat the object with an existing ProductCategory.
/// Changes are sent to the server using SaveChangesOptions.Batch so that all operations are sent in a single HTTP request.
/// </summary>
/// <param name="product">The product to be Added</param>
public void AddProduct(Product product)
{
product.rowguid = Guid.NewGuid();
context.AddObject("Products", product);
context.SetLink(product, "ProductCategory", product.ProductCategory);
context.SaveChanges(SaveChangesOptions.Batch);
}
/// <summary>
/// Try to delete the specified product, if product cannot be deleted, return error message "Product Cannot be Deleted"
/// </summary>
/// <param name="product">The product to be deleted</param>
public string DeleteProduct(Product product)
{
context.DeleteObject(product);
try
{
context.SaveChanges();
}
catch (DataServiceRequestException)
{
return "Product Cannot be Deleted";
}
return null;
}
public void UpdateProduct(Product product)
{
this.product = gateway.GetProducts(product.Name, product.ProductCategory)[0];
FormCreateMode = false;
this.Title = "Edit " + product.Name;
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
BindCategories();
if (FormCreateMode)
{
product = new Product();
}
BindProduct();
}
/// <summary>
/// This method assumes that all fields have been changed and updates the entire entity, including the association to ProductCategory.
/// Changes are sent to the server using SaveChangesOptions.Batch so that all operations are sent in a single HTTP request.
/// </summary>
/// <param name="product">The product to be Updated</param>
public void UpdateProduct(Product product)
{
ProductCategory newCategory = product.ProductCategory;
context.SetLink(product, "ProductCategory", newCategory);
context.UpdateObject(product);
context.SaveChanges(SaveChangesOptions.Batch);
}