Question

我不知道它是否是一个很好的实践，但我想将子目录用于目录“Views”和“ViewModels”

我现在有这个代码

namespace Project.Universal.ViewModels.Sales
{
    public class SalesListViewModel:ViewModelBase
    {
        // Properties
        private string _test;
        private ICollection<Sale> _sales;

        public string Test
        {
            get => _test;
            set => SetProperty(ref _test, value);
        }

        public ICollection<Sale> Sales {
            get => _sales;
            private set
            {
            }
        }

        // Services
        private readonly IStandardService<Sale> _salesService;

        // Commands
        public DelegateCommand Update { get;}

        // Constructor
        public SalesListViewModel(IStandardService<Sale> salesService)
        {


            Debug.WriteLine(">>>> Initializing SalesListViewModel, trying to set _salesService.");
            _salesService = salesService;

            Debug.WriteLine(">>>> Delegating command to update SalesListViewModel.");
            Update = new DelegateCommand(async () =>
            {
                Sales = await _salesService.GetAsync();
                Test = "Test";
            });
        }

    }
}

这是我的观点页面

<mvvm:SessionStateAwarePage
    x:Class="Project.Universal.Views.Sales.SalesListPage"
    mvvm:ViewModelLocator.AutoWireViewModel="True"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Project.Universal.Views.Sales"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    xmlns:mvvm="using:Prism.Windows.Mvvm"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid Margin="{StaticResource MediumLeftTopRightBottomMargin}">
        <TextBlock>this is the Sales page</TextBlock>
        <TextBlock Text="{Binding Test}"></TextBlock>
    </Grid>
</mvvm:SessionStateAwarePage>

但是Prism没有正确地注入视图模型。取消这一点，Prism框架正在注入ShellViewModel，就像错误贝拉说：

错误：BindingExpression路径错误：'Project.Universal.ViewModels.ShellViewModel'上找不到'Test'属性。 BindingExpression：Path ='Test'DataItem ='Project.Universal.ViewModels.ShellViewModel'; target元素是'Windows.UI.Xaml.Controls.TextBlock'（Name ='null'）; target属性是'Text'（类型'String'）

对于组织，我想将此模式用于文件夹：

Views/Context/ViewPage.xaml for views
ViewModels/Context/ViewModel.cs for viewModels

我正在使用带有Prism 6.3框架的Windows Template Studio模板。抱歉我的英文。

Answer 1

几小时后我就解决了我的问题：

Windows Template Studio已更改ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver()方法以保持与其他框架的兼容性。我刚刚改变了这个方法，就像我想要的那样有效。对于会遇到同样问题的其他人，这是代码。

班级App.xaml.cs

    protected override async Task OnInitializeAsync(IActivatedEventArgs args)
        {
            await ThemeSelectorService.InitializeAsync().ConfigureAwait(false);

            ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver((viewType) =>
            {
                var viewName = viewType.FullName; // get full type name
                var viewModelName = viewName
                    .Substring(0, viewName.Length - 4)
                    .Replace(".Views.", ".ViewModels.");
                var viewModelAssembly = viewType.GetTypeInfo().Assembly.FullName;
                //var viewModel
                var viewModelTypeName = string.Format(CultureInfo.InvariantCulture, "{0}ViewModel, Project.Universal", viewModelName);

                return Type.GetType(viewModelTypeName);
            });
            await base.OnInitializeAsync(args);
        }

UWP中具有子目录的Prism Auto ViewModelLocator

1 个答案: