WPF Datagrid cannot select rows with mouse click

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I have a WPF app with a tab control, within the tab control there are tab items. I have wpf user controls wthin; 3 of which have wpf datagrids in them.

Everything was fine until yesterday when I added the last of the 3, and I cannot select rows within the datagrid with a mouse click. The other 2 work fine. Here is the XAML code of the one with the problem usercontrol:

HTML

<UserControl x:Class="Hadley.SalesPricingCardConsole.UserControls.ExcludeCustomerSections"
             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" >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="25"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="300"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="5"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="5"/>
            <RowDefinition Height="25*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125*" />
        </Grid.ColumnDefinitions>
        <Grid.Background>
            <ImageBrush ImageSource="..\Images\silver_fp.jpg" />
        </Grid.Background>
        <Label Content="List of In-Active Customer Sections" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="3" />
        <DataGrid x:Name="DatagridExcluded" Grid.Column="1" Grid.Row="2" Grid.ColumnSpan="4" AutoGenerateColumns="False" 
                  ItemsSource="{Binding Path=SearchData}" IsReadOnly="False" AlternatingRowremoved="#d4e8c1" >
            <DataGrid.Background>
                <ImageBrush ImageSource="..\Images\silver_fp.jpg" />
            </DataGrid.Background>
            <DataGrid.RowStyle>
                <Style TargetType="{x:Type DataGridRow}" x:Name="DataGridRowStyle" >
                    <EventSetter Event="DataGridRow.MouseDoubleClick" Handler="DatagridExcluded_MouseDoubleClick" />
                </Style>
            </DataGrid.RowStyle>
            <DataGrid.Columns>
                <DataGridTextColumn Header="Customer Name" Width="*" Binding="{Binding Path=CustomerName}" IsReadOnly="False" />
                <DataGridTextColumn Header="Section Number" Width="*" Binding="{Binding Path=SectionNumber}" IsReadOnly="False" />
                <DataGridTextColumn Header="Company Code" Width="*" Binding="{Binding Path=CompanyCode}" IsReadOnly="False" />
            </DataGrid.Columns>
            <DataGrid.ContextMenu>
                <ContextMenu>
                    <MenuItem x:Name="miMakeActive" Header="Make Active" Click="miMakeActive_Click" />
                </ContextMenu>
            </DataGrid.ContextMenu>
        </DataGrid>
        <TextBox x:Name="txtCustomer" Grid.Column="1" Grid.Row="4" Grid.ColumnSpan="2" />
        <TextBox x:Name="txtSection" Grid.Column="3" Grid.Row="4" Grid.ColumnSpan="2" Margin="10,0,0,0" />
        <Button x:Name="btnAddNew"  Grid.Column="3" Grid.Row="6" Grid.ColumnSpan="2" Width="110" 
                HorizontalAlignment="Left" Margin="10,0,0,0" Content="Add New Entry" Click="btnAddNew_Click" />
    </Grid>
</UserControl>

The data gets into the datagrid, and everything looks fine except I cannot select a row. The ContextMenu works, but seems to be sending the event from the datagrid header, not the row. The MouseDoubleClick event seems to work fine, but my end users will want to see a nice blue row when selected.

Here is the parent forms AXML:

HTML

<Window xmlns:my="clr-namespace:Hadley.SalesPricingCardConsole.UserControls" x:Class="Hadley.SalesPricingCardConsole.SalesPricingCardConsole"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Height="700" Width="920" MinWidth="920" MinHeight="500" Icon="Images\NewIcon.ico" Closing="Window_Closing" Loaded="Window_Loaded">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="900*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="175*"/>
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.Background>
            <ImageBrush ImageSource="Images\wallpaper-Silver.bmp" />
        </Grid.Background>
        <TabControl x:Name="tabMain" Grid.Row="0" SelectionChanged="TabControl_SelectionChanged">
            <TabItem Header="Search Central Database" Visibility="{Binding MainDBAccessVisibility}">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="900*"/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="145"/>
                        <RowDefinition Height="100*" />
                    </Grid.RowDefinitions>
                    <Grid.Background>
                        <ImageBrush ImageSource="Images\silver_fp.jpg" />
                    </Grid.Background>
                    <my:Search x:Name="ucSearch" Grid.Row="0" />
                    <my:SearchResultsGrid x:Name="ucSearchResultsGrid" Grid.Row="1" VerticalAlignment="Top" />
                    <!--<Border Grid.Row="1" BorderBrush="DarkGray" BorderThickness="2"/>
                    <Border Grid.Row="0" BorderBrush="DarkGray" BorderThickness="2"/>-->
                </Grid>
            </TabItem>
            <TabItem Header="Group Operations" Visibility="{Binding GroupsVisibility}">
                <DockPanel >
                    <my:Groups x:Name="ucGroups" DockPanel.Dock="Top"/>
                </DockPanel>
            </TabItem>
            <TabItem Header="Configuration" Visibility="Visible">
                <DockPanel >
                    <my:Configuration x:Name="ucConfiguration" DockPanel.Dock="Top"/>
                </DockPanel>
            </TabItem>
            <TabItem Header="Local Saved Sales Pricing Cards" x:Name="tabItemLocalData" Visibility="{Binding LocalDBAccessVisibility}">
                <DockPanel >
                    <my:LocalDataGrid x:Name="ucLocalData" DockPanel.Dock="Top"/>
                </DockPanel>
            </TabItem>
            <TabItem Header="Manage In-Active Customer Sections" x:Name="tabExcludedSections" Visibility="Visible" >
                <DockPanel>
                    <my:ExcludeCustomerSections x:Name="ucExclusions" DockPanel.Dock="Top" />
                </DockPanel>
            </TabItem>
            <!--<TabItem x:Name="tabItemHelp" Header="Help">
                <my:Help />
            </TabItem>-->
        </TabControl>
        <my:MessagePlane x:Name="ucUserMessages" Grid.Row="1" DockPanel.Dock="Bottom" VerticalAlignment="Bottom" />
        <Rectangle x:Name="recBusy" Opacity="0.3" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="1" Grid.RowSpan="3" Visibility="{Binding BusyVisibility}">
            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
                    <GradientStop Color="LightGray" Offset="0.0" />
                    <GradientStop Color="Gray" Offset="0.25" />
                    <GradientStop Color="SlateGray" Offset="0.75" />
                    <GradientStop Color="WhiteSmoke" Offset="1.0" />
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
    </Grid>
</Window>

The offending User Control is 'ExcludeCustomerSections'.

Here is a working users control's AXML:

HTML

<UserControl x:Class="Hadley.SalesPricingCardConsole.UserControls.LocalDataGrid"
             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" Loaded="UserControl_Loaded" >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="25"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="25"/>
            <RowDefinition Height="500*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="90" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="125" />
            <ColumnDefinition Width="1*" />
        </Grid.ColumnDefinitions>
        <Grid.Background>
            <ImageBrush ImageSource="..\Images\silver_fp.jpg" />
        </Grid.Background>
        <Button x:Name="btnDeleteAllLocalSPCs" Content="Delete ALL local data" Width="150" Height="22" VerticalAlignment="Top" 
                Grid.Row="1" Grid.Column="5" Grid.ColumnSpan="2" HorizontalAlignment="Left" 
                IsEnabled="{Binding GetDataButtonEnabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                Click="btnDeleteAllLocalSPCs_Click"/>
        <Button x:Name="btnGetData" Content="Get Local Data" Grid.Row="1" Grid.Column="1" Height="22" VerticalAlignment="Top" IsEnabled="{Binding GetDataButtonEnabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Click="btnGetData_Click"/>
        <Button x:Name="btnSyncData" Width="150" Height="47" Grid.ColumnSpan="2" Grid.Row="1" Grid.RowSpan="2" VerticalAlignment="Top" HorizontalAlignment="Left" Grid.Column="3" 
                IsEnabled="{Binding SyncDataEnabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Click="btnSyncData_Click" >
            <TextBlock>Sync All Local Data with <LineBreak/> Central Database</TextBlock>
        </Button>
        <Button x:Name="btnCreateNewSPC" Content="Create New" Grid.Row="2" Grid.Column="5" Height="22" VerticalAlignment="Top" 
                Click="btnCreateNewSPC_Click" />
        <DataGrid x:Name="dataGridLocalData" Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="7" AutoGenerateColumns="False" 
                  ItemsSource="{Binding Path=SearchData}" MouseDoubleClick="dataGridLocalData_MouseDoubleClick" CellEditEnding="dataGridLocalData_CellEditEnding">
            <DataGrid.Background>
                <ImageBrush ImageSource="..\Images\silver_fp.jpg" />
            </DataGrid.Background>
            <DataGrid.RowStyle>
                <Style TargetType="{x:Type DataGridRow}" x:Name="DataGridRowStyle" >
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Path=IsEdited}" Value="true">
                            <Setter Property="Background" Value="PaleGreen"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding Path=IsEdited}" Value="false">
                            <Setter Property="Background" Value="WhiteSmoke"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding Path=IsNewLocalSPC}" Value="true">
                            <Setter Property="Background" Value="Yellow"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.RowStyle>            
            <DataGrid.Columns>
                <DataGridTextColumn Header="PrimaryKey" Binding="{Binding Path=PrimaryKey}" Visibility="Collapsed" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colCustomer" Header="Customer" Width="*" Binding="{Binding Path=Customer}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colSection" Header="Section Number" Width="*" Binding="{Binding Path=SectionNumber}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colDescription" Header="Description" Width="*" Binding="{Binding Path=Description}" IsReadOnly="True" />
                <DataGridTextColumn x:Name="colPPTonne" Header="Price Per Tonne" Width="*" Binding="{Binding Path=PricePerTonne, StringFormat=C, ConverterCulture=en-GB}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colPP100M" Header="Price Per 100M" Width="*" Binding="{Binding Path=PricePer100M, StringFormat=C, ConverterCulture=en-GB}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colContrib" Header="Contribution Percent" Width="*" Binding="{Binding Path=ContributionPercent, StringFormat=P2}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colCreatedDate" Header="Date Created" Width="*" Binding="{Binding Path=DateEntered, StringFormat='{}{0:d-MMM-yyyy}'}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colValidFrom" Header="Valid From" Width="*" Binding="{Binding Path=ValidFrom, StringFormat='{}{0:d-MMM-yyyy}'}" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="colCompanyCode" Header="Company Code" Width="*" Binding="{Binding Path=CompanyCode}" IsReadOnly="True"/>
                <DataGridTextColumn Header="Notes" Width="*" Binding="{Binding Path=Notes}" >
                    <DataGridTextColumn.ElementStyle>
                        <Style TargetType="TextBlock">
                            <Setter Property="TextWrapping" Value="Wrap" />
                        </Style>
                    </DataGridTextColumn.ElementStyle>
                </DataGridTextColumn>
                <DataGridTextColumn x:Name="colReferenceNo" Header="Reference No" Width="*" Binding="{Binding Path=ReferenceNumber}" IsReadOnly="True"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</UserControl>

Anybody got any suggestions ?? I've tried everything I can think of.

Thanks in advance.

Baxter.

Posted 21-Feb-12 22:19pm

Baxter R Pearson

Updated 23-Dec-20 5:36am

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Baxter R Pearson · Answer 1 · 2012-02-21T22:37:00

It's fixed the selection changed event was firing for the tab control, even when the selection wasn't changing(??). So the seletion was being cancelled.

Saw this happening by putting the data access onto another thread. Then I could see the selection/deselction happpening. Before that nothing.

Cheers, BP

Member 12459153 · Answer 2 · 2020-12-23T05:36:00

Solution 2

Also the Tabfolder gotfocus event cancels the selection of the datagrid on it

mfg Ulf

Posted 23-Dec-20 5:36am

Member 12459153

WPF Datagrid cannot select rows with mouse click

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