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DeepClear

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GridView

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Richard Harrigan asked on 28 May 2011, 02:05 AM

Hi

The following code clears all rows in the grid. I also need to clear out the GridViewHeader(s). Can this be done?

Thanks
Rich

public static void DeepClear(RadGridView grid)

{

grid.Columns.Clear();

IEnumerable<GridViewRow> rows = grid.ChildrenOfType<GridViewRow>().Where(s => s.Item != null);

foreach (GridViewRow row in rows)

{

if (row.ChildrenOfType<RadGridView>().Count > 0)

{

DeepClear(row.ChildrenOfType<RadGridView>().First());

}

4 Answers, 1 is accepted

answered on 31 May 2011, 08:37 AM

RadGridView-DeepClear.zip

Hello Richard Harrigan,

I have tested the DeepClear method and it clears all the data that is shown on the grid, including the values in the Header cells. I am not sure if you mean to clear the values in the GridViewHeader, or to remove the entire GridViewHeader.

Generally it is not a good idea to work with the Visual Elements instead of Data Elements. It is better that you use the following approach to clear all the GridView's data and its Headers:

private void DeepClear(RadGridView grid)

{

grid.ItemsSource = null;

grid.Columns.Clear();

}

I have prepared a sample project. Would you please review it and clarify what exactly do you mean by "clear out the GridViewHeader(s)"?

All the best,
Didie
the Telerik team

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answered on 02 Jun 2011, 06:44 PM

Hi.

That did not work for me.

Your example does not include the condition that causes my problem.

- I am generating the data dynamically using the light-weight data table

- After executing the deep clear I regenerate the data based on new column selections for the same tables

- Any header that was shown by being expanded in the previous state of the grid is now shown in the new version. That is, in the new version when I expand I get two headers. I also get two RadGridView_DataLoading events. If I deepclear and reload again I wind up with three headers.

My app is generating queries by example so this is a iterave process and I need to totally cear out everything so that the grid is in the same state as generated in the xaml.

I don't know if this effects anything but you may want to look at the xaml. It contains a GridHeader style to put a button on the header.

Thanks
Rich

<telerik:RadGridView Name="radGridView"

Visibility="Collapsed"

HeaderRowStyle="{StaticResource style1}"

ItemsSource="{Binding Collection}"

ShowGroupPanel="False"

RowIsExpandedChanging="radGridView_RowIsExpandedChanging"

DataLoading="radGridView_DataLoading"

RowLoaded="radGridView_RowLoaded"

SelectionMode="Single"

SelectionChanged="radGridView_SelectionChanged"

AutoGenerateColumns="False">

</telerik:RadGridView>

<UserControl xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="Cloudburst.PaneForm.QueryDesignForm"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:telerikGridViewFilter="clr-namespace:Telerik.Windows.Controls.GridView.Filter"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d"

d:DesignHeight="300" d:DesignWidth="400">

<UserControl.Resources>

<SolidColorBrush x:Key="GridView_HeaderRowInnerBorder"

Color="#FF4B4B4B" />

<telerik:Office_BlackTheme x:Key="Theme" />

<SolidColorBrush x:Key="GridView_HeaderInnerBorder"

Color="#FF4B4B4B" />

<LinearGradientBrush x:Key="GridView_HeaderBackground"

EndPoint="0.5,1"

StartPoint="0.5,0">

<GradientStop Color="#FF5B5B5B"

Offset="1" />

<GradientStop Color="#FF868686" />

<GradientStop Color="#FF4F4F4F"

Offset="0.42" />

<GradientStop Color="#FF0E0E0E"

Offset="0.43" />

</LinearGradientBrush>

<DataTemplate x:Key="GridViewHeaderIndentCellDataTemplate">

<telerik:GridViewHeaderIndentCell telerik:StyleManager.Theme="{StaticResource Theme}" />

</DataTemplate>

<telerik:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />

<ControlTemplate x:Key="GridViewHeaderRowTemplate"

TargetType="telerik:GridViewHeaderRow">

<telerik:SelectiveScrollingGrid>

<telerik:SelectiveScrollingGrid.ColumnDefinitions>

<ColumnDefinition Width="Auto" />

<ColumnDefinition Width="*" />

</telerik:SelectiveScrollingGrid.ColumnDefinitions>

<Border x:Name="PART_GridViewHeaderRowBorder"

BorderBrush="{TemplateBinding BorderBrush}"

BorderThickness="{TemplateBinding BorderThickness}"

Grid.ColumnSpan="4"

HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"

Padding="{TemplateBinding Padding}"

VerticalAlignment="{TemplateBinding VerticalContentAlignment}">

<Border BorderBrush="{StaticResource GridView_HeaderRowInnerBorder}"

BorderThickness="1"

Background="{TemplateBinding Background}" />

</Border>

<telerik:DataCellsPresenter x:Name="PART_DataCellsPresenter"

Grid.Column="3"

telerik:StyleManager.Theme="{StaticResource Theme}" />

<Border x:Name="PART_IndicatorPresenter"

BorderBrush="{TemplateBinding BorderBrush}"

BorderThickness="0,0,1,1"

telerik:SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical"

Visibility="{TemplateBinding RowIndicatorVisibility}"

Width="25">

<Border BorderBrush="{StaticResource GridView_HeaderInnerBorder}"

BorderThickness="1"

Background="{StaticResource GridView_HeaderBackground}">

<telerik:RadButton Click="PropertyButton_Click"

IsBackgroundVisible="False"

ToolTipService.ToolTip="Edit properties"

Margin="0">

<Image Source="Images2/Properties_16.png"

Height="16"

Width="16"></Image>

</telerik:RadButton>

</Border>

<telerik:IndentPresenter x:Name="PART_IndentPresenter"

Grid.Column="1"

ItemTemplate="{StaticResource GridViewHeaderIndentCellDataTemplate}"

IndentLevel="{TemplateBinding IndentLevel}"

MinHeight="{TemplateBinding MinHeight}"

telerik:SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical"

telerik:StyleManager.Theme="{StaticResource Theme}" />

<Border x:Name="PART_HierarchyIndentPresenter"

BorderBrush="{TemplateBinding BorderBrush}"

BorderThickness="0,0,1,1"

Grid.Column="2"

telerik:SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical"

Visibility=

"{Binding HasHierarchy, Converter={StaticResource BooleanToVisibilityConverter}, RelativeSource={RelativeSource TemplatedParent}}"

Width="25">

<Border BorderBrush="{StaticResource GridView_HeaderInnerBorder}"

BorderThickness="1"

Background="{StaticResource GridView_HeaderBackground}" />

</Border>

</telerik:SelectiveScrollingGrid>

</ControlTemplate>

<LinearGradientBrush x:Key="GridView_HeaderRowBackground"

EndPoint="0.5,1"

StartPoint="0.5,0">

<GradientStop Color="#FF5B5B5B"

Offset="1" />

<GradientStop Color="#FF868686" />

<GradientStop Color="#FF4F4F4F"

Offset="0.42" />

<GradientStop Color="#FF0E0E0E"

Offset="0.43" />

</LinearGradientBrush>

<SolidColorBrush x:Key="GridView_HeaderRowOuterBorder"

Color="#FF848484" />

<Style x:Key="style1"

TargetType="telerik:GridViewHeaderRow">

<Setter Property="Template"

Value="{StaticResource GridViewHeaderRowTemplate}" />

<Setter Property="Background"

Value="{StaticResource GridView_HeaderRowBackground}" />

<Setter Property="MinHeight"

Value="27" />

<Setter Property="BorderBrush"

Value="{StaticResource GridView_HeaderRowOuterBorder}" />

<Setter Property="BorderThickness"

Value="1,0,0,1" />

<Setter Property="VerticalContentAlignment"

Value="Stretch" />

<Setter Property="HorizontalContentAlignment"

Value="Stretch" />

<Setter Property="Padding"

Value="0" />

</Style>

</UserControl.Resources>

<Grid x:Name="LayoutRoot" Background="White">

<telerik:RadGridView Name="radGridView"

Visibility="Collapsed"

HeaderRowStyle="{StaticResource style1}"

ItemsSource="{Binding Collection}"

ShowGroupPanel="False"

RowIsExpandedChanging="radGridView_RowIsExpandedChanging"

DataLoading="radGridView_DataLoading"

RowLoaded="radGridView_RowLoaded"

SelectionMode="Single"

SelectionChanged="radGridView_SelectionChanged"

AutoGenerateColumns="False">

</telerik:RadGridView>

</Grid>

</UserControl>