public void ApplyChange(IResourceContext resource, ChangeEventArgs ev)
{
var book = resource.RequireValue <Book>();
var revert = new Dictionary <string, object>(ev.ChangedProperties.Count);
if (ev.ChangedProperties.TryGetValue("title", out object titleObject))
{
string title = (string)titleObject;
if (title == "")
{
throw new ResException("Title must not be empty.");
}
if (title != book.Title)
{
revert["title"] = book.Title;
book.Title = title;
}
}
if (ev.ChangedProperties.TryGetValue("author", out object authorObject))
{
string author = (string)authorObject;
if (author == "")
{
throw new ResException("Author must not be empty.");
}
if (author != book.Author)
{
revert["author"] = book.Author;
book.Author = author;
}
}
ev.SetRevert(revert);
}
// Applies the changes to the database.
public void ApplyChange(IResourceContext resource, ChangeEventArgs ev)
{
var customer = resource.RequireValue <Customer>();
var revert = new Dictionary <string, object>(ev.ChangedProperties.Count);
// Apply Name
if (ev.ChangedProperties.TryGetValue("name", out object nameObject))
{
string name = (string)nameObject;
if (name != customer.Name)
{
revert["name"] = customer.Name;
customer.Name = name;
}
}
// Apply Email
if (ev.ChangedProperties.TryGetValue("email", out object emailObject))
{
string email = (string)emailObject;
if (email != customer.Email)
{
revert["email"] = customer.Email;
customer.Email = email;
}
}
// Apply Country
if (ev.ChangedProperties.TryGetValue("country", out object countryObject))
{
string country = (string)countryObject;
if (country != customer.Country)
{
revert["country"] = customer.Country;
customer.Country = country;
}
}
// Update the database if there are any changes to apply
if (revert.Count > 0)
{
customers.Update(customer);
}
ev.SetRevert(revert);
}
