Geek Answers Handbook

WPF DataGrid - Binding Columns to a ViewModel Page

I am trying to associate the data in one of my columns with the data that is on my ViewModel page (as opposed to the objects to which the grid is attached).

What was recommended to me below here to no avail.

   <DataGridTemplateColumn>
      <DataGridTemplateColumn.CellTemplate>
         <DataTemplate>
            <Button Content="{Binding ElementName=LayoutRoot, Path=DataContext.JUNK}"></Button>
         </DataTemplate>
      </DataGridTemplateColumn.CellTemplate>
   </DataGridTemplateColumn>

In my ViewModel

public string JUNK { get; set; }

What is installed in the "HELLO"ViewModel constructor

Does anyone see what I'm doing wrong?

EDIT

Here is the whole XAML. The corresponding column is completely located below, in the grid inside the grid

. ( , citrix ), , datagrid, TextBlock , . , . , , .

<UserControl x:Class="MainApp.WPF.ucFmvHistoryDisplayGrid"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="1000" x:Name="LayoutRoot">

<UserControl.Resources>
    <Style x:Name="rightAlignedColumn" x:Key="rightAlignedColumn" TargetType="TextBlock">
        <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>

    <Style x:Name="centerAlignedColumn" x:Key="centerAlignedColumn" TargetType="TextBlock">
        <Setter Property="HorizontalAlignment" Value="Center" />
    </Style>
</UserControl.Resources>

<Grid>
    <DataGrid x:Name="dbTop" ItemsSource="{Binding PropertyGroupSource}" HorizontalAlignment="Left" Background="White" CanUserAddRows="False" CanUserDeleteRows="False" CanUserReorderColumns="False" CanUserResizeRows="False" IsReadOnly="True" AutoGenerateColumns="False" Grid.Row="1" Width="800">
        <DataGrid.Columns>
            <DataGridTextColumn Width="120" Header="Property Num" Binding="{Binding PropertyNum}"></DataGridTextColumn>
            <DataGridTextColumn Width="120" Header="Alt Description" Binding="{Binding AltDescription}"></DataGridTextColumn>
            <DataGridTextColumn Width="80" Header="County" Binding="{Binding County}"></DataGridTextColumn>
            <DataGridTextColumn Width="100" Header="State" Binding="{Binding State}" ElementStyle="{StaticResource centerAlignedColumn}"></DataGridTextColumn>
            <DataGridTextColumn Width="85" Header="Phase" Binding="{Binding Phase}"></DataGridTextColumn>
            <DataGridTextColumn Width="85" Header="FMV" Binding="{Binding FmvTotal}"></DataGridTextColumn>
            <DataGridTextColumn Width="100" Header="Assessed Value" Binding="{Binding AssessedValueTotal}"></DataGridTextColumn>
        </DataGrid.Columns>
        <DataGrid.RowDetailsTemplate>
            <DataTemplate>
                <Border Margin="5" BorderBrush="Black" BorderThickness="1">
                    <DataGrid Margin="5" Background="White" CanUserAddRows="False" CanUserDeleteRows="False" CanUserReorderColumns="False" CanUserResizeRows="False" IsReadOnly="True" AutoGenerateColumns="False" Grid.Row="1" ItemsSource="{Binding PropertyFmvSource}">
                        <DataGrid.Columns>
                            <DataGridTextColumn Width="125" Header="County Acct Num" Binding="{Binding Property.CountyAccountNum, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="City" Binding="{Binding Property.City, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="Jurisdiction" Binding="{Binding Property.Jurisdiction, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="80" Header="FMV Date" Binding="{Binding MostRecentFMV.FMVDate, StringFormat=d}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="100" Header="FMV" Binding="{Binding MostRecentFMV.FMV, StringFormat=N0}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="85" Header="Assess Ratio" Binding="{Binding MostRecentFMV.AssessmentRatio, StringFormat=N3}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTextColumn Width="105" Header="Assessed Value" Binding="{Binding MostRecentFMV.AssessedValue, StringFormat=N0}" ElementStyle="{StaticResource rightAlignedColumn}"></DataGridTextColumn>
                            <DataGridTemplateColumn>
                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <Button Content="{Binding ElementName=LayoutRoot, Path=DataContext.JUNK}"></Button>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>
                            </DataGridTemplateColumn>
                        </DataGrid.Columns>
                    </DataGrid>
                </Border>
            </DataTemplate>
        </DataGrid.RowDetailsTemplate>
    </DataGrid>
</Grid>

+5
2

DataContext DataGrid RelativeSource :

<Button Content="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=DataGrid, AncestorLevel=2}, Path=DataContext.JUNK}"></Button>

DataGrids, AncestorLevel "2" DataContext DataGrid.

+2

@ . , , DataGridColumn, DataContext

, : http://blogs.infragistics.com/blogs/josh_smith/archive/2008/06/26/data-binding-the-isvisible-property-of-contextualtabgroup.aspx

DataContextSpy, :

DataContextSpy

public class DataContextSpy
: Freezable // Enable ElementName and DataContext bindings
{
    public DataContextSpy()
    {
        // This binding allows the spy to inherit a DataContext.
        BindingOperations.SetBinding(this, DataContextProperty, new Binding());
    }

    public object DataContext
    {
        get { return (object)GetValue(DataContextProperty); }
        set { SetValue(DataContextProperty, value); }
    }

    // Borrow the DataContext dependency property from FrameworkElement.
    public static readonly DependencyProperty DataContextProperty =
        FrameworkElement.DataContextProperty.AddOwner(typeof(DataContextSpy));

    protected override Freezable CreateInstanceCore()
    {
        // We are required to override this abstract method.
        throw new NotImplementedException();
    }
}

DataContextSpy DataGridColumn,

<Grid Name="LayoutRoot">
    <Grid.Resources>
        <local:DataContextSpy x:Key="dataContextSpy" />
    </Grid.Resources>
    <DataGrid ...>
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="{Binding Path=DataContext.JUNK,
                                           Source={StaticResource dataContextSpy}}">
                <!--..-->
            </DataGridTemplateColumn>
            <!--..-->
        </DataGrid.Columns>
    </DataGrid>
</Grid>
+2

More articles:


All Articles