Re: How to set DataSource for DataGridView in WPF - WPF Discussion Boards

Czechtim213-Dec-08 11:19

13-Dec-08 11:19

Thank you, code os now OK Big Grin | :-D

I somebody know, how to set DataSource for DataGridView in this application, I would be happy

Mark Salsbery13-Dec-08 17:16

13-Dec-08 17:16

Without even getting in to the code behind...

All you have is a data template. Without a visual element in existence based
on the template, there's no visual tree to search Smile | :)

I'm not sure what you are trying to do with the template, but if you just want
to see it work, here's a starting point:

<Window x:Class="WPFAppl.WpfWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
    Title="Title" 
	Height="200" 
	Width="400" 
	WindowStartupLocation="CenterScreen" 
	Loaded="Window_Loaded">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal" Grid.Row="0">
            <WindowsFormsHost Width="360" >
                <wf:DataGridView x:Name="gridView" 
                                  AllowUserToAddRows="False" 
                                  SelectionMode="FullRowSelect" 
                                  EditMode="EditProgrammatically" >
                </wf:DataGridView >
            </WindowsFormsHost >
        </StackPanel>
    </Grid>
</Window>


        private DataTable dt;
		
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            dt = new DataTable();
            dt.Columns.Add("attr1", typeof(string));
            dt.Columns.Add("attr2", typeof(string));
            dt.Columns.Add("attr3", typeof(string));
            gridView.DataSource = dt;
        }

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Czechtim213-Dec-08 22:07

13-Dec-08 22:07

I know that works this way, but I need to have that template in DataTemplate because of my application where I need to change more templates. In one of that templates I need to have DataGridView and somehow set DataSource.
Don´t you know please another way how to set DataSource for that XAML in my first message?

Mark Salsbery14-Dec-08 9:38

14-Dec-08 9:38

You can't set the datasource on an element until the element actually exists.

A template is just a template - "Describes the visual structure of a data object".

What are you trying to achieve?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Czechtim214-Dec-08 11:04

14-Dec-08 11:04

I´m trying to do some applicaton where in one template I would use DataGridView and in another template I wouldn´t use DataGridView. DataTemplates have another structure (different number of rows, columns in Grid...) I tried something... I set DataSource somehow, but when I change DataTemplate and then again change to the first DataTemplate with DataGridView, DataSource isn´t set Frown | :-(

) (sample code below)

WpfWindow.xaml

<Window x:Class="WPFAppl.WpfWindow" 	    
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 	    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 	    
        xmlns:local="clr-namespace:WPFAppl" 	    
        Title="Title" 
        Height="200"
        Width="400"	    
        WindowStartupLocation="CenterScreen" 
        Name="This" 	    
        Loaded="UserControl_Loaded"
        SizeChanged="gridView_SelectionChanged">
    <Window.Resources>
        <DataTemplate x:Key="ThisTemplate">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <StackPanel Orientation="Horizontal" 
                            Grid.Row="0" >
                    <WindowsFormsHost Width="360" 
                                      xmlns="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration">
                        <DataGridView x:Name="gridView" 
                                      AllowUserToAddRows="False"
                                      SelectionMode="FullRowSelect"    
                                      EditMode="EditProgrammatically"
                                      xmlns="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms" >
                        </DataGridView>
                    </WindowsFormsHost>
                </StackPanel>
                <Button Height="22.5" Grid.Row="2" Name="button1" Width="75" Click="button1_ClickT1">Button</Button>
            </Grid >
        </DataTemplate>
        <DataTemplate x:Key="SecondTemplate">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Label Grid.Row="0" Grid.Column="1" Name="label1" Width="120">Second template</Label>
                <Button Height="22.5" Grid.Row="1" Name="button1" Width="75" Click="button1_Click">Button</Button>
            </Grid>
        </DataTemplate>
    </Window.Resources>
</Window>

WpfWindow.xaml.cs

using System; 	
using System.Collections.Generic; 	
using System.Linq; 	
using System.Text; 	
using System.Windows; 	
using System.Windows.Controls; 	
using System.Windows.Data; 	
using System.Windows.Documents; 	
using System.Windows.Input; 	
using System.Windows.Media; 	
using System.Windows.Media.Imaging; 	
using System.Windows.Navigation; 	
using System.Windows.Shapes; 	
using System.ComponentModel; 	
using System.Collections.ObjectModel; 	
using System.Xml; 	
using System.Data; 	
using System.Globalization;
using System.Windows.Threading;
using System.Threading;

namespace WPFAppl
{ 	    /// <summary> 	    
    /// Interaction logic for Window1.xaml 	    
    /// </summary> 	    
    public partial class WpfWindow : Window
    {
        public WpfWindow() 
        { 
            InitializeComponent(); 
        }

        private DataTemplate ChildTemplate;
        private ContentPresenter ParentTemplate;
        private DataTable dt;

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            dt = new DataTable();
            dt.Columns.Add("attr1", typeof(string));
            dt.Columns.Add("attr2", typeof(string));
            dt.Columns.Add("attr3", typeof(string));
            System.Windows.Forms.DataGridView gw1 = ChildTemplate.FindName("gridView", ParentTemplate) as System.Windows.Forms.DataGridView;
            gw1.DataSource = dt;
        }

        //find element in visual tree
        private childItem FindVisualChild<childitem>(DependencyObject obj) where childItem : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                if (child != null && child is childItem)
                    return (childItem)child;
                else
                {
                    childItem childOfChild = FindVisualChild<childitem>(child);
                    if (childOfChild != null)
                        return childOfChild;
                }
            }
            return null;
        }

        private void gridView_SelectionChanged(object sender, EventArgs e)
        {
            this.ContentTemplate = FindResource("ThisTemplate") as DataTemplate;
            ChildTemplate = FindResource("ThisTemplate") as DataTemplate;
            ParentTemplate = FindVisualChild<contentpresenter>(This);
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.ContentTemplate = FindResource("ThisTemplate") as DataTemplate;
        }

        private void button1_ClickT1(object sender, RoutedEventArgs e)
        {
            this.ContentTemplate = FindResource("SecondTemplate") as DataTemplate;
        }
    }
} 
</contentpresenter></childitem></childitem>

Mark Salsbery14-Dec-08 12:06

14-Dec-08 12:06

The code still doesn't make sense to me...

All you show is templates - no actual visual elements.

Why can't you just add a Loaded event handler to the WindowsFormsHost and
set the DataGridView's DataSource in that handler?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Czechtim215-Dec-08 2:31

15-Dec-08 2:31

Thank you very much for advice. That works very well now.
I´m beginner in WPF so I didn´t know about that Loaded event handler in WindowsFormsHost.

But when I set DataTemplate as ContentTemplate (this.ContentTemplate = FindResource("PresentationTemplate") as DataTemplate; ), that elements in DataTemplate can be considered as visual elements or can´t?

Mark Salsbery15-Dec-08 10:28

15-Dec-08 10:28

Czechtim2 wrote:
I didn´t know about that Loaded event handler in WindowsFormsHost.

Any class derived from FrameworkElement has the Loaded event.
FrameworkElement is derived from UIElement, so you get all the
UIElement properties and events as well Smile | :)

Czechtim2 wrote:
when I set DataTemplate as ContentTemplate (this.ContentTemplate = FindResource("PresentationTemplate") as DataTemplate; ), that elements in DataTemplate can be considered as visual elements or can´t?

Yes. Once you've actually created instances of the elements described by the
template, well... then you have actual instances. Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Czechtim215-Dec-08 10:33

15-Dec-08 10:33

OK thank you very much

change menustrip

jogisarge12-Dec-08 5:17

jogisarge

12-Dec-08 5:17

Hi,

i want to change the colors of a menustrip(VS2008).
i changed the backgroundcolor and the textcolor with the designer.
the background is black and the text is grey.
it looks nice but if i hover over the menu, the submenu pops up and the style looks like the standard style.
How can i change the colors of the menuitems too ?

bye jo

Re: change menustrip

Mark Salsbery12-Dec-08 7:05

12-Dec-08 7:05

Here's an example of applying a style to MenuItems...

WPF XAML MenuItem Styles[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Instance Error in xaml

Arijit Manna11-Dec-08 23:15

Arijit Manna

11-Dec-08 23:15

Whenever I try to run the WPF application I am getting the following error:

Cannot create instance of 'Window1' defined in assembly 'C1WPFGrid, Version=1.0.0.0,

Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an

invocation. Error in markup file 'Window1.xaml' Line 1 Position 9.

Am I leaving out any declarations ? Please advise ! Confused | :confused:

Best Wishes ....... ARIJIT

Pete O'Hanlon12-Dec-08 1:26

Pete O'Hanlon

12-Dec-08 1:26

This normally means that there's a bit of a binding problem going on here. Take a look in the Output window to see if anything's causing a problem - also, set a breakpoint on the InitializeComponent method.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

My blog | My articles | MoXAML PowerToys

Mark Salsbery12-Dec-08 7:08

12-Dec-08 7:08

Arijit Manna wrote:
Error in markup file 'Window1.xaml' Line 1 Position 9.

I'm curious....what does line 1 of 'Window1.xaml' look like? Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Arijit Manna12-Dec-08 18:00

Arijit Manna

12-Dec-08 18:00

The delrations in XAML are like theis :

<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="CIWPFGrid" Height="346" Width="628" xmlns:c1grid="http://schemas.componentone.com/wpf/C1DataGrid" WindowState="Maximized">

Best Wishes ....... ARIJIT

Mark Salsbery13-Dec-08 6:07