Ví dụ về việc sử dụng View model trong Tiếng anh và bản dịch của chúng sang Tiếng việt
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Creating a view model.
They can be defined as command objects oras command methods in the view model.
The view references the view model through its DataContext property.
In MVVM, the view's data context is set to the view model.
We can also specify in XAML that the view model be set as the view's data context.
The view model may define logical states that the view can represent visually to the user.
Its customers can view model.
The view model is responsible for coordinating the view's interaction with any model classes that are required.
The view model may convert or manipulate model data so that it can be easily consumed by the view. .
In WPF, you can associate a data template with a view model type at the application level.
Typically, the view model uses the observer pattern to notify changes in the view model to model. .
NET Core MVC Apps,the model could be a Domain model, View Model or an Edit Model. .
The view model may also define logical states the view can use to provide visual changes in the UI.
It is also used to configure and initialize the module catalog andthe shell's view and view model or presenter.
Typically, the view model will define commands or actions that can be represented in the UI and that the user can invoke.
To ensure that the UI iskept up to date when the data changes in the view model, it should implement the appropriate change notification interface.
In most cases, the view model will define commands or actions that can be represented in the UI and that the user can invoke.
If you need to implement filtering, sorting, grouping,or selection tracking of items in the collection from within your view model, your view model should create an instance of a collection view class for each collection to be exposed to the view. .
The view model can also programmatically change the current selection in the UI by calling methods on the collection view object.
For example, you may need to allow the collection of items to be filtered or sorted according to presentation logic implemented in the view model, or you may need to keep track of the currently selected item in the view so thatcommands implemented in the view model can act on the currently selected item.
The view model should implement a read-only property that returns an ICollectionView reference so that controls in the view can data bind to the collection view object and interact with it.
On the other hand, the Model View View Model capability allows developers to work separately on the same app section with the same set of data.
If property values in the view model change, those new values automatically propagate to the view via data binding and notification.
A common example is when the view model provides a Submit command that allows the user submit data to a web service or to a data repository.
When the user selects a customer in the UI, the view model will be informed so that it can apply the commands that relate to the currently selected customer.
The properties and commands that the view model provides define the functionality to be offered by the UI, but the view determines how that functionality is to be displayed.
Implementing the INotifyPropertyChanged interface on many view model classes can be repetitive and error-prone because of the need to specify the property name in the event argument.
The interactions between the view and its view model are perhaps the most important to consider, but the interactions between the model classes and the view model are also important.
Collection view classes can be used by the view model to keep track of important state information for the underlying collection, while maintaining a clean separation of concerns between the UI in the view and the underlying data in the model. .