棱鏡5和Unity - 手動解決視圖與視圖模型連接好

Question

使用： WPF，棱鏡5，統一

我想寫我稱之爲「WindowDialogService」，當傳遞的類型，並呼籲，將以該類型作爲內容打開一個窗口。我的問題是我無法讓ViewModel實例化並關聯到視圖。

我不知道這是否是正確的，但我用我的視圖AutoWireViewModel，並假設（顯然不正確地），該視圖模型將被「位於」使用Unity容器即container.TryResolve <T>()

所以基本上解決的時候，我可以解析視圖，但視圖的DataContext爲null。

我在下面列出了所有相關的代碼。

查看

<dxc:DXWindow x:Class="ListClassList.Views.AddToClassView" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:prism="http://prismlibrary.com/"  
       prism:ViewModelLocator.AutoWireViewModel="True" 
       xmlns:dxe="clr-namespace:DevExpress.Xpf.Editors.Settings;assembly=DevExpress.Xpf.Core.v15.2" 
       xmlns:dxeditors="http://schemas.devexpress.com/winfx/2008/xaml/editors" 
       xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/core" 
       xmlns:dxgt="http://schemas.devexpress.com/winfx/2008/xaml/grid/themekeys" 
      xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"    
      xmlns:extToolkit="http://schemas.xceed.com/wpf/xaml/toolkit" 
        WindowStartupLocation="CenterScreen" 
        dxc:ThemeManager.ThemeName="VS2010" 
        Title="{Binding Title}" 
        Width="800" 
        Height="500" 
       ResizeMode="CanResizeWithGrip" 
      > 
    <Grid> 
    </Grid> 
</dxc:DXWindow> 

視圖模型

using MyApp.Data; 
using MyApp.Models.Model; 
using Prism.Commands; 
using Prism.Mvvm; 
using System; 
using System.Collections.Generic; 
using System.Collections.ObjectModel; 
using System.Linq; 
using System.Windows; 

namespace ListClassList.ViewModels 
{ 
    public class AddToClassViewViewModel : BindableBase 
    { 
     private readonly MyAppDbContext _context; 

     private ObservableCollection<MasterClass> _masterClasses; 
     public ObservableCollection<MasterClass> MasterClasses 
     { 
      get { return _masterClasses; } 
      set { SetProperty(ref _masterClasses, value); } 
     } 

     private ObservableCollection<Student> _students; 
     public ObservableCollection<Student> Students 
     { 
      get { return _students; } 
      set 
      { 
       SetProperty(ref _students, value); 
      } 
     } 


     public DelegateCommand FinishCommand { get; set; } 


     public AddToClassViewViewModel(IStudentTimetableService studentTimetableService) 
     { 


     } 

    } 
} 

IWindowDialogService接口

using System; 
using System.Windows; 
    namespace MyApp.Infrastructure.Services.Dialogs.WindowDialog 
    { 
     public interface IWindowDialogService 
     { 
      bool? ShowDialog<T>(Action onDialogClosed) where T : Window; 
     } 
    } 

WindowDialogService實施

using System; 
using System.Collections.Generic; 
using System.Windows; 
using Microsoft.Practices.ServiceLocation; 
using Prism.Unity; 


namespace MyApp.Infrastructure.Services.Dialogs.WindowDialog 
{ 
    public sealed class WindowDialogService : IWindowDialogService 
    { 
     private readonly List<Window> _openWindows = new List<Window>(); 
     private static volatile WindowDialogService _instance; 
     private static readonly object SyncRoot = new Object(); 

     private WindowDialogService() { } 

     public static WindowDialogService Instance 
     { 
      get 
      { 
       if (_instance == null) 
       { 
        lock (SyncRoot) 
        { 
         if (_instance == null) 
          _instance = new WindowDialogService(); 
        } 
       } 
       return _instance; 
      } 
     } 


     public bool? ShowDialog<T>(Action onDialogClosed) where T : Window 
     { 
      try 
      { 
       using (var container = new Microsoft.Practices.Unity.UnityContainer()) 
       { 
        var dialog = (Window)container.TryResolve <T>(); 
        dialog.Closed += (s, e) => onDialogClosed(); 
        var result = dialog.ShowDialog(); 
        return result; 
       } 

      } 
      catch (Exception) 
      { 

       throw; 
      } 
     } 
    } 
} 

Answer 1

棱鏡6自動執行此操作，對於棱鏡5，你需要沿着

ViewModelLocationProvider.SetDefaultViewModelFactory(type => Container.Resolve(type)); 

線在你的引導程序的