我正在尝试使用Structuremap IoC容器将C#WPF应用程序覆盖到MVVM模式中,以进行依赖项注入。
在尝试在UserControls中使用与Windows相同的命令绑定之前,我的代码才能正常工作。
如果我尝试在某个UserControl中绑定命令,则会出现以下错误:System.Windows.Data Error: 40 : BindingExpression path error: 'HelloWorldCommand' property not found on 'object' ''MainWindowViewModel' (HashCode=7304143)'. BindingExpression:Path=HelloWorldCommand; DataItem='MainWindowViewModel' (HashCode=7304143); target element is 'Button' (Name=''); target property is 'Command' (type 'ICommand')
所以问题是我的HelloWorldCommand
是我的CustomUserControlViewModel
中包含MainWindowViewModel
并由其绑定的。
只有ObjectFactory方法不同,如下所示:
public sealed class ObjectFactory
{
public static IContainer Container { get; private set; }
private static Action<ConfigurationExpression> _initialiseMethod;
private static readonly Lazy<IContainer> _containerBuilder =
new Lazy<IContainer>(CreateContainer, LazyThreadSafetyMode.ExecutionAndPublication);
public static void Initialise()
{
Container = _containerBuilder.Value;
}
private static IContainer CreateContainer()
{
return new Container(config =>
{
#region services
config.For<IFileDisplayerService>().Singleton().Use<FileDisplayerService>();
config.For<IWatermarkService>().Singleton().Use<WatermarkService>();
#endregion
#region windows
config.For<IWindow>().Use<MainWindow>();
config.For<IWatermarkWindow>().Use<WatermarkSettingsWindow>();
config.For<IMainWindow>().Singleton().Use<MainWindow>();
config.For<IMainWindowViewModel>().Singleton().Use<MainWindowViewModel>();
config.For<IWatermarkSettingsWindow>().Singleton().Use<WatermarkSettingsWindow>();
config.For<IWatermarkSettingsWindowViewModel>().Singleton().Use<WatermarkSettingsWindowViewModel>();
#endregion
#region views
config.For<IFileListView>().Use<FileListView>();
config.For<IFileListViewModel>().Use<FileListViewModel>()
.Ctor<IView>().Is<FileListView>();
config.For<IFileDisplayerView>().Use<FileDisplayerView>();
config.For<IFileDisplayerViewModel>().Use<FileDisplayerViewModel>()
.Ctor<IView>().Is<FileDisplayerView>();
#endregion
});
}
}
我的具体问题是,如何将命令绑定到具有自己的ViewModel和父ViewModel的用户控件?上面的示例中未显示。
我认为父级ViewModel也应包含该命令,但我不知道如何将其从子级ViewModel传递给父级ViewModel。
答案 0 :(得分:0)
谢谢mm8,我解决了以下问题:
MainWindowViewModel:
name
现在我可以将UserControl的ViewModel绑定到UserControlView中:
// Get response
var jsonData = pm.response.json();
var resultCount = jsonData.length;
// Test arrays
var hasPregnancy = [];
var doesntHavePregnancy = [];
// Loop through and set arrays with matching data
for (i = 0; i < resultCount; i++) {
var id = jsonData[i].id;
var modelString = jsonData[i].name.toLowerCase();
if (modelString.includes("pregnancy")) {
hasPregnancy.push({
"id": id,
"hasPregnancy": modelString.has("pregnancy")
});
} else {
doesntHavePregnancy.push({
"id": id
});
}
}
// Check that each object in response contained keyword and length matches from test
pm.test("Expect response to contain pregnancy in each object", function() {
console.log(hasPregnancy);
console.log(doesntHavePregnancy);
pm.expect(hasPregnancy.length).to.equal(resultCount);
});
这不完全是我想要的,但它使我免于灾难性的意大利面条式代码。我认为我有一个子视图集合是可行的,如果它在父视图中不可用,该子视图集合可用于自动绑定来自他们的命令。但这现在足以进行项目。谢谢!