在列标题中使用文本框-C#WPF [英] use textbox in column header - c# wpf

问题描述

我的列标题中有一个文本框和一个按钮.直到我按下按钮，文本框才应折叠.问题是我无法以编程方式访问文本框.

I have a textbox and a button in my columnheader. The textbox should be collapsed until i press the button. The problem is i can't access the textbox programmaticly.

我尝试了 tbTest.Visibility = Visibility.Visible; ，但显示了以下错误:

I tried tbTest.Visibility = Visibility.Visible; but it shows the following error:

名称'tbTest'在当前上下文中不存在"

"The name 'tbTest' does not exist in the current context"

我还需要 tbTest.Text ，它不起作用.

I also need tbTest.Text and it doesnt work.

这是我的代码:

<DataGridTextColumn.HeaderStyle>
                        <Style TargetType="DataGridColumnHeader">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="DataGridColumnHeader">
                                        <Grid>
                                            <Grid.ColumnDefinitions>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                            </Grid.ColumnDefinitions>

                                            <ContentPresenter />


                                            <Label Grid.Column="0" Padding="5 0" Content="Gruppe" VerticalAlignment="Center" Cursor="Hand" Foreground="White"/>

                                            <TextBox x:Name="tbTest" Grid.Column="1" Width="150"  Visibility="Collapsed" TextChanged="tbTest_TextChanged"></TextBox>

                                            <Button Grid.Column="2" x:Name="btnFilterGroup" Style="{StaticResource MyButton}" Width="16" Height="16" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0 0 10 0" Click="btnFilterGroup_Click">
                                                <Button.Background>
                                                    <ImageBrush ImageSource="Resources/filter.png"/>
                                                </Button.Background>
                                            </Button>


                                            <Thumb x:Name="PART_RightHeaderGripper" Grid.Column="3" HorizontalAlignment="Right" Width="2" BorderThickness="0.6" 
                                                   BorderBrush="{Binding VerticalGridLinesBrush, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" Cursor="SizeWE"/>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </DataGridTextColumn.HeaderStyle>

推荐答案

您无法使用数据网格的名称访问在数据网格内部使用的文本框.您必须使用以下代码来访问单击按钮时的文本框.

You can't access the textbox which is used inside the datagrid using it's name. You have to use the following code to access the textbox on button click.

<DataGrid HorizontalAlignment="Left" Margin="28,152,0,0" VerticalAlignment="Top" Height="132" Width="436">
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.HeaderStyle>
                        <Style TargetType="DataGridColumnHeader">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="DataGridColumnHeader">
                                        <Grid>
                                            <Grid.ColumnDefinitions>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                            </Grid.ColumnDefinitions>

                                            <ContentPresenter />


                                            <Label Grid.Column="0" Padding="5 0" Content="Gruppe" VerticalAlignment="Center" Cursor="Hand" Foreground="White"/>

                                            <TextBox x:Name="tbTest" Grid.Column="1" Width="150"  Visibility="Hidden" TextChanged="tbTest_TextChanged" Loaded="tbTest_Loaded"></TextBox>

                                            <Button Grid.Column="2" x:Name="btnFilterGroup" Width="16" Height="16" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0 0 10 0" Click="btnFilterGroup_Click">

                                            </Button>


                                            <Thumb x:Name="PART_RightHeaderGripper" Grid.Column="3" HorizontalAlignment="Right" Width="2" BorderThickness="0.6" 
                                                   BorderBrush="{Binding VerticalGridLinesBrush, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" Cursor="SizeWE"/>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </DataGridTemplateColumn.HeaderStyle>
                </DataGridTemplateColumn>
                <DataGridTextColumn Header="Active"></DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>

现在，将以下代码添加到文本框的已加载事件中，以获取其实例.

Now, add the following code to the loaded event of the textbox to get the instance of it.

private void tbTest_Loaded(object sender, RoutedEventArgs e)
        {
            tblBox = (sender as TextBox);
        }

最后，将以下代码添加到按钮单击事件中，以更改文本框的可见性.

Finally, add the following code to the button click event to change the visibility of the textbox.

private void btnFilterGroup_Click(object sender, RoutedEventArgs e)
        {
            tblBox.Visibility = Visibility.Visible;
        }

希望这可以满足您的需求.

Hope this helps your need.

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