标签: design-data

我在WPF应用程序中使用MVVM模式以允许全面的单元测试.MVVM模式本身是伟大的工作,但我挣扎中,这意味着我可以使用设计时数据支持WPF的方式相适应的模式.

当我使用Prism时,ViewModel实例通常被注入到视图的构造函数中,就像这样

public MyView(MyViewModel viewModel)
{
    DataContext = viewModel;
}

然后将ViewModel的依赖项注入构造函数中,就像这样

public class MyViewModel
{
    public MyViewModel(IFoo foo, IBar bar)
    {
        // ...
    }

    // Gets and sets the model represented in the view
    public MyModel { get; set; }

    // Read-only properties that the view data binds to
    public ICollectionView Rows { get; }
    public string Title { get; }

    // Read-write properties are databound to the UI and are used to control logic
    public string Filter { get; …

我有一个包含ListBox的WPF窗口.ItemsSource绑定到视图模型的属性.

<Window x:Class="SimpleWpfApp.View.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525"
        DataContext="{Binding MainWindowViewModel, Source={StaticResource Locator}}">
  <DockPanel>
    <ListBox ItemsSource="{Binding SomeThings}" />
  </DockPanel>
</Window>

视图模型的属性是自定义接口的可观察集合; ISomeInterface.界面非常简单,由SomeClass实现,它还会覆盖ToString.

public class MainWindowViewModel
{
  public ObservableCollection<ISomeInterface> SomeThings
  {
    get
    {
      var list = new List<ISomeInterface>
      {
        new SomeClass {Value = "initialised"},
        new SomeClass {Value = "in"},
        new SomeClass {Value = "code"}
      };

      return new ObservableCollection<ISomeInterface>(list);
    }
  }
}

public interface ISomeInterface
{
  string Value { get; }
}

public class SomeClass : ISomeInterface
{
  public string …