access object in codebehind

[Bart]

Hi Guys,

I'm struggling with an issue and I can't figure why this goes wrong.

I cannot access my object in the resourcedictionary in my code behind.  What I have is the following
I have a resourcedictionary like this.

 

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
                    xmlns:telerikScheduleView="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.ScheduleView"
                    xmlns:telerikColorPickers="clr-namespace:Telerik.Windows.Controls.RichTextBoxUI.ColorPickers;assembly=Telerik.Windows.Controls.RichTextBoxUI"
                    xmlns:local="clr-namespace:Proj"
                    xmlns:p="clr-namespace:Proj.Resources"
                    x:Class="Proj.ProductieOrderViewRecources">


    <DataTemplate x:Key="ProductieOrderViewToolBarTemplate">
        <telerik:RadRichTextBoxRibbonUI x:Name="richTextBoxRibbonUI"

 

this whitin this resourcedictionary
I have a radgridview like this.

<DataTemplate x:Key="ProductieOrderViewMainSectorTemplate">
    <Grid Margin="10">
        <Grid>
            <telerik:RadBusyIndicator x:Name="BusyIndicator" Grid.Row="2" Visibility="{Binding ShowPlanning}" >
                <telerik:RadGridView x:Name="gridViewAdminData"
                                     ItemsSource="{Binding DataRecords}"
                                     RowEditEnded="EditRecord"
                                     DataLoading="LoadData"
                                     SelectionChanged="GridSelectionChanged"
                                     FrozenColumnCount ="5"
                                     AutoGenerateColumns="False"
                                     Deleting="RadGridView_deleting"
                                     SelectedItem="{Binding SelectedPlanning}">
                    <telerik:RadGridView.Columns>
                        <telerik:GridViewDataColumn DataMemberBinding="{Binding Artikel}" IsReadOnly="True" />
                        <telerik:GridViewDataColumn DataMemberBinding="{Binding Aantal}" />

now I'm trying the access the gridViewAdminData by name in the code behind.

but it won't work at all.
I have this in my code

public partial class ProductieOrderViewRecources : ResourceDictionary
{
    public ProductieOrderViewRecources()
    {
        InitializeComponent();

            System.Linq.Expressions.Expression<Func<Proj.Models.productieorder, double>> expression = order => (order.AantalTeProduceren + 10);
            //RadGridView gridViewAdminData = (RadGridView)this["gridViewAdminData"];
            GridViewExpressionColumn column = gridViewAdminData.Columns["TotalValue"] as GridViewExpressionColumn;
            column.Expression = expression;

    }
}

but gridViewAdminData won't get recognized. Also enabling the line above gives back a null value.

Does anyone have any idea about how to access this object in the code behind?

thank you

[Martin Ivanov]

Hello Bart,

You can't access a UIElement that is defined in a DataTemplate directly in code-behind using its Name. To modify a UIElement in a template you can use data binding. Or you get the element after it loads using code. There is an example in stackoverflow. Alternatively, you can use the ChildrenOfTypeExtensions.ChildrenOfType<T>() method to find the gridview instance after it is loaded. For example:

ChildrenOfTypeExtensions.ChildrenOfType<RadGridView>(parentElementThatHostsTheDataTemplate).FirstOrDefault(x => x.Name == "gridViewAdminData");

Regards,
Martin
Telerik by Progress

[Bart]

hi,
thank you for the reply

I've tried a lot, but I already went with the onload event

private void LoadData(object sender, GridViewDataLoadingEventArgs e)
       {
           rgv = (RadGridView)sender;

           Expression<Func<proj.Models.planning, double>> expression = planning => ((planning.Aantal ?? 0) + planning.TotalStock);
           GridViewExpressionColumn column = rgv.Columns["TotalValue"] as GridViewExpressionColumn;
           column.Expression = expression;

       }

which works for me.