我正在试验创建的WPF掩码背后的代码,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,我得到了两列("vorname"one_answers"nachname")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("vorname"或"nachname")。当我在运行时在DatGrid中选择一个项目时,该项目的数据将显示在TextBoxes中。
首先,我尝试在XAML文件中定义DataGrid,并在代码中生成TextBoxes及其绑定。在这里它工作得很好。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,它就不再工作了。是否有某种NotifyOnSelectedIndexChanged,我缺少它?
任何帮助都将不胜感激。
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);
尝试使用Source
属性而不是ElementName
设置绑定源
//selectedItemBinding.ElementName = "datagrid"
selectedItemBinding.Source = datagrid;
问题可能是对项的ElementName
查找没有按预期工作,因为项是在运行时通过代码隐藏动态添加的。