How to set DataSource for DataGridView in WPF [modified] - WPF Discussion Boards

I have overridden the control template for a ProgressBar by changing the style of the PART_Track and PART_Indicator parts of it, but I have no clue how to override the animation that's taking place when a progressbar's IsIndeterminate property is set. Does anyone know if it's overridable at all, and if so, how?

Regards,
Øyvind.

I am not sure, did you try BackgroundWorker, progressReport() ?

Charith Jayasundara

Charith Jayasundara wrote:
I am not sure, did you try BackgroundWorker, progressReport() ?

No, not in this case anyway. I don't think it would work, since the animation should go on even if no progress was reported from the background worker at all until it finished.

Anyway, I think I have found a solution on my own. Here it is, if anyone else needs to do the same:

I used Expression Blend to examine the source xaml code for the default ProgressBar control template, and found that it uses a ProgressBarBrushConverter to return a Brush based on some input values. With some googling I found this[^]">, which basically disassembles the ProgressBarBrushConverter.Convert method. Then I was able to make my own BrushConverter : IMultiValueConverter to use.

Regards,
Øyvind

Hi,

I have two InkCanvas in two applications. I am finding it difficult to duplicate the stroke "erasure by points" action on one InkCanvas to the other.

Basically my application communicates over the Network and can send strokes to the other InkCanvas which adds them.

Now, say
a) Canvas1 sends Stroke1 and Canvas2 receives and adds it to it.
b) Canvas1 deletes some Stroke1 portion (at the middle) which basically splits it into two strokes. This split is to be reflected in Canvas2 also.

My Question is, How can I possibly achieve this ?

I do not think I can collect the "Erasure by Points" cursor movement as a stroke, transfer to other side and clip off that part of the stroke in Canvas2.

I could imitate the "Delete as STroke" event, that deletes a full stroke by exchanging the full stoke to Canvas2, locating it, and then doing a Canvas2.Strokes.RemoveAt(position)

Will somebody have any suggestion ??
Thanks in advance.

ps: Also posted @ http://social.msdn.microsoft.com/Forums/en-US/tabletandtouch/thread/a535fe90-a8fb-4d34-adc6-d08086123627

-regmee

Hi
I have a canvas which loads x amount of Images(from an array), via the Image Control.

I have a single context menu assigned to all of them when i right click the context ment appears and menu items and works, thanks to the help of another user Big Grin | :-D

.

my problem is now, when i right click to get the contextmenu how do i also get what the parent conttrol it was launched from i.e image[5]

using c# and using context menu programatically.

i.e

Contextmenu CM = new contextmenu();
Menu Item Mn1 = new menuItem();
cm.add(mn1)

Foreach image in array

imagx[x].context menu = CM
Mn1.click = delegate { MN1Click(arg,arg);};

etc etc

would like to pass what image the context menu was called from to the MN1Click.

Thanks
Thanks

modified on Monday, December 15, 2008 3:58 AM

I need some help. I have a wpf text box that I need to be able to enter a newLine only on Shift+Enter key combination. If I set AcceptsReturn property to true then i cannot capture keys. Enter automatically gives me new line which I don't need. Basically i need to emulate InstantMessenger text box. Enter == send message and Shift+Enter == new line.. I'm trying to stay away from building a Custom Control that emulates text box.
Any help would be appreciated..
Environment = .NET3.5 SP1 C# WPF VS2008 SP1
Thank you!!
EmirG.

Try using the PreviewKeyDown event. This seemed to work ok.

<Window x:Class="ImTextbox.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="355" Width="498">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="250*" />
            <RowDefinition Height="67*" />
        </Grid.RowDefinitions>
        <ItemsControl x:Name="listbox">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Border BorderBrush="Chartreuse" BorderThickness="2" CornerRadius="5" Margin="2" >
                        <ContentPresenter Content="{Binding}" Margin="4"/>
                    </Border>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
        <TextBox AcceptsReturn="True" x:Name="textbox" Grid.Row="1" Margin="4" />
    </Grid>
</Window>

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
        textbox.PreviewKeyDown += new KeyEventHandler(textbox_PreviewKeyDown);
    }

    void textbox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter && (e.KeyboardDevice.Modifiers & ModifierKeys.Shift) != ModifierKeys.Shift)
        {
            listbox.Items.Add(textbox.Text);
            textbox.Clear();
            e.Handled = true;
        }
    }
    
}

I need this structure (DataGridView id DataTemplate) and I have problem with DataSource. I tried to find gridview and set DataSource in code-behind, but InvalidOperationException is showing : "This operation is valid only on elements that have this template applied."
I think I have applied this template.
Could somebody please help me how to set DataSource? DataSource can be set any way.

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">
    <window.resources>
        <datatemplate x:key="ThisTemplate"> 
           <grid> 
                <grid.rowdefinitions> 
                    <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> 
            </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) 
        { 
            this.ContentTemplate = FindResource("ThisTemplate") as DataTemplate; 
            ChildTemplate = FindResource("ThisTemplate") as DataTemplate; 
            ParentTemplate = FindVisualChild<contentpresenter>(This); 
            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; 
        } 
    } 
}  </childitem></childitem></contentpresenter>

modified on Saturday, December 13, 2008 5:24 PM

Can you fix your post?

Change all "<" to "<" and ">" to "&gt";

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

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

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]

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?

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]

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>

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]

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?

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]

OK thank you very much

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

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

WPF XAML MenuItem Styles[^]

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

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

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

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]

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

In addition to Pete's suggestions, I would try removing elements from the
window and adding them in one at a time until it breaks. XAML makes that
an easy process.

Mark

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