Basics of Caliburn Micro in WPF MVVM - Part II Binding

private readonly SimpleInjector.Container container;

/// <summary>

/// holds teh event aggregator

/// </summary>

private readonly IEventAggregator eventAggregator;

/// <summary>

/// The logger.

/// </summary>

private ILog logger;

/// <summary>

/// The searchText property.

/// </summary>

private string searchText;

/// <summary>

/// Initializes a new instance of the <see cref="MainWindowViewModel"/> class.

/// </summary>

/// <param name="container">

/// The container.

/// </param>

/// <param name="eventAggregator">

/// The event aggregator.

/// </param>

public MainWindowViewModel(SimpleInjector.Container container, IEventAggregator eventAggregator)

{

this.container = container;

this.DisplayName = "Sample main window view model";

this.eventAggregator = eventAggregator;

this.eventAggregator.Subscribe(this);

this.logger = this.container.GetInstance<ILog>();

this.logger.Info("MainWindow view loaded");

}

/// <summary>

/// Gets or sets the message.

/// </summary>

public string SearchText

{

get

{

return this.searchText;

}

set

{

this.searchText = value;

this.NotifyOfPropertyChange(() => this.searchText);

}

}

/// <summary>

/// Search action

/// </summary>

public void Search()

{

MessageBox.Show(String.Format("Search is being performed for text {0}", this.SearchText));

}

}

}

So in the view model we have defined a property named SearchText and a void method named Search. We have done another setup in the constructor of the MainWindowViewModel class.

Now the magic begins. You don't have to write anything else so just press F5 and run the application.

You can ask how the controls on the view are bound to the property and the method is bound with the Click action of the button. Here's the magic that happens behind the scenes. We talked about the naming conventions. If you look at the View then we have the TextBox named same as the property defined in the Viewmodel, similarly the button has the same name as the Method. This is how Caliburn detects and maps the properties and methods to the controls with their kinds.

We'll look at more advanced stuff in future articles on Caliburn Micro. So stay tuned and happy programming.