Question

我正在尝试使用代码隐藏创建的WPF掩码作为WPF掩码设计器的原型。在我的ViewModel中，我有一个DataTable和一个DataView（它只是DataTable的DefaultView）。在我的DataTable中，我有两列（＆＃34; vorname＆＃34;和＆＃34; nachname＆＃34;）和四行。在我的WPF掩码中，我希望有一个DataGrid和两个TextBox，它们绑定到DataGrid的SelectedItem和列（＆＃34; vorname＆＃34;或＆＃34; nachname＆＃34;）。当我在运行时在DatGrid中选择一个项目时，该项目中的数据将显示在TextBoxes中。

首先，我尝试在XAML文件中定义DataGrid，并在代码中生成TextBoxes和它们的绑定。这里工作正常。我在DataGrid中选择一个项目，该项目的数据显示在TextBoxes中。

但是当我在代码中生成网格时，它不再起作用了。是否有某种NotifyOnSelectedIndexChanged，我失踪了？

任何帮助将不胜感激。

这是XAML：

<Window x:Class="DesignerTest.TestWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TestWindow"
        Height="400"
        Width="600">
    <DockPanel x:Name="mainpanel">
        <!--<DataGrid x:Name="datagrid"
                  DockPanel.Dock="Top"
                  Height="120" />-->
        <WrapPanel x:Name="wrappanel">
            <!--<TextBox x:Name="vornameSelected" Width="150" Margin="5" Text="{Binding SelectedItem.vorname, ElementName=datagrid}" IsEnabled="False" />
            <TextBox x:Name="nachnameSelected" Width="150" Margin="5" Text="{Binding SelectedItem.nachname, ElementName=datagrid}" IsEnabled="False" />-->
            <!--<TextBox x:Name="vornameSelected" Width="150" Margin="5" IsEnabled="False" />
            <TextBox x:Name="nachnameSelected" Width="150" Margin="5" IsEnabled="False" />-->
        </WrapPanel>
    </DockPanel>
</Window>

这是创建和绑定的代码：

    // The ViewModel und the DataTable are created.
    _vm = new SerializingTestViewModel();
    _vm.CreateDataTable();
    this.DataContext = _vm.DataTable;

    // The DataGrid  and it's Binding are created.
    DataGrid datagrid = new DataGrid();
    datagrid.Name = "datagrid";
    DockPanel.SetDock(datagrid, Dock.Top);
    datagrid.Height = 120;
    datagrid.ItemsSource = _vm.DataSource;
    mainpanel.Children.Add(datagrid);

    // The Textboxes and the Bindings are created.
    TextBox vornameSelected = new TextBox();
    vornameSelected.Name = "vornameSelected";
    vornameSelected.Width = 150;
    Thickness margin = new Thickness(5);
    vornameSelected.SetValue(TextBox.MarginProperty, margin);
    vornameSelected.IsEnabled = false;
    Binding selectedItemBinding = new Binding();
    selectedItemBinding.ElementName = "datagrid";
    selectedItemBinding.Path = new PropertyPath("SelectedItem.vorname");
    vornameSelected.SetBinding(TextBox.TextProperty, selectedItemBinding);
    wrappanel.Children.Add(vornameSelected);

    TextBox nachnameSelected = new TextBox();
    nachnameSelected.Name = "nachnameSelected";
    nachnameSelected.Width = 150;
    margin = new Thickness(5);
    nachnameSelected.SetValue(TextBox.MarginProperty, margin);
    nachnameSelected.IsEnabled = false;
    selectedItemBinding = new Binding();
    selectedItemBinding.ElementName = "datagrid";
    selectedItemBinding.Path = new PropertyPath("SelectedItem.nachname");
    nachnameSelected.SetBinding(TextBox.TextProperty, selectedItemBinding);
    wrappanel.Children.Add(nachnameSelected);

Answer 1

尝试使用Source属性设置绑定源，而不是ElementName

//selectedItemBinding.ElementName = "datagrid"
selectedItemBinding.Source = datagrid;

问题可能是项目的ElementName查找没有按预期工作，因为项目是在运行时通过代码隐藏动态添加的。

绑定到代码隐藏创建的DataGrid的SelectedItem的文本框不会实现

1 个答案: