我正在尝试从ViewModel
属性初始化父usercontrol
属性..以下是快照...我想初始化父"一个"和"两个" usercontrol的属性,如果属性为null
或vice-versa
window.xaml
<Window x:Class="wpfParentUserControlDemo.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"
xmlns:local="clr-namespace:wpfParentUserControlDemo"
mc:Ignorable="d"
Title="MainWindow" Height="369.737" Width="525">
<Window.DataContext>
<local:ParentViewModel />
</Window.DataContext>
<Grid Margin="0,0,0,-4">
<local:UserControl1 DataContext="{Binding One}" Margin="288,49,22,240"></local:UserControl1>
<local:UserControl1 DataContext="{Binding Two}" Margin="10,49,283,240"></local:UserControl1>
</Grid>
</Window>
MainWindow.cs
using System.Windows;
namespace wpfParentUserControlDemo
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
}
public class ParentViewModel : BaseViewModel
{
private DemoConnectionViewModel _One;
public DemoConnectionViewModel One
{
get { return _One; }
set { _One = value; }
}
private DemoConnectionViewModel _Two;
public DemoConnectionViewModel Two
{
get { return _Two; }
set { _Two = value; }
}
}
}
UserControl1.Xaml
<UserControl x:Class="wpfParentUserControlDemo.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:wpfParentUserControlDemo"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<ComboBox ItemsSource="{Binding Connections}" DisplayMemberPath="Name" ></ComboBox>
</Grid>
</UserControl>
UserControl1.cs
using System.Collections.ObjectModel;
using System.Data;
using System.Windows.Controls;
namespace wpfParentUserControlDemo
{
/// <summary>
/// Interaction logic for UserControl1.xaml
/// </summary>
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
if (this.DataContext == null)
{
var ViewModel = new DemoUserMainViewModel();
ViewModel.Connections = new ObservableCollection<DemoConnectionViewModel>();
ViewModel.Connections.Add(new DemoConnectionViewModel { Name = "A", Type = SqlDbType.BigInt });
ViewModel.Connections.Add(new DemoConnectionViewModel { Name = "B", Type = SqlDbType.Bit });
ViewModel.Connections.Add(new DemoConnectionViewModel { Name = "C", Type = SqlDbType.NVarChar });
this.DataContext = ViewModel;
}
}
}
public class DemoUserMainViewModel : BaseViewModel
{
private ObservableCollection<DemoConnectionViewModel> _Connections;
public ObservableCollection<DemoConnectionViewModel> Connections
{
get { return _Connections; }
set { _Connections = value; }
}
}
public class DemoConnectionViewModel : BaseViewModel, IDataConnection
{
private string _Name;
public string Name
{
get { return _Name; }
set { _Name = value; }
}
private SqlDbType _Type;
public SqlDbType Type
{
get { return _Type; }
set { _Type = value; }
}
}
}
IDataConnection.cs
using System.Data;
namespace wpfParentUserControlDemo
{
public interface IDataConnection
{
string Name { get; set; }
SqlDbType Type { get; set; }
}
}
答案 0 :(得分:0)
我不确定您要做什么,但如果您想检查DataContext
的{{1}}是否已设置,则应等到它已加载。
然后,您可以使用UserControl
方法访问父窗口的DataContext
:
Window.GetWindow