Windows Presentation Foundation (WPF) Forum

TextFormatter exception

2010-02-06T16:10:27Z

FormattedText ft = new FormattedText("Hello", CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
new Typeface("Verdana"), 100, Brushes.Black);
double d = ft.MinWidth;

Why does the second line throw an ArgumentNullException
Stack : MS.Internal.TextFormatting.TextFormatterImp.VerifyTextFormattingArguments(...)

Value cannot be null
Parameter name: textSource

styling error in WPF

2010-01-20T07:31:51Z

Hi Every one,

Am facing 2 problems while using styles in WPF

1. when am styling statusbar and toolbar am getting this error

Could not load type 'Microsoft.Windows.Design.Metadata.ProvideMetadataAttribute' from assembly 'Microsoft.Windows.Design.Extensibility, Version=3.5.0.0,

Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Line '1' Position '364'

and on degin it shows shows PROBLEM LOADING and down RELOAD THE DESIGNER.

when i click reload the error will go and when i rebuild or debug the application it comes again.

Every time i rebuild or debug i have to click Reload The Designer to see the design. How to remove this error.

2. Am also applying styles for my datagrid(WPF Toolkit), in this i have applied styles to datagridcolumnheader, everything is fine

but when the total columns length is less than datagrid width, the column headers will get style and the remaining part will be the same old.

its looking very odd, when i searched for this i came to know that we have to apply style for datagridcolumncontainer, but i don't know how to apply style for that,

Can anyone help me on this 2 issues.

Thanks in Advance

Hiran Repakula

RibbonTab.IsOpen became False by unknown cause!

2010-02-10T07:52:08Z

I have a problem with the RibbonTab.IsOpen chg to False by unknown reason!

I have a custom Popup stick on the RibbonBar, being used as data validation message.
When a DatePicker got invalid value, and upon PreviewLostKeyboardFocus, I will show the custom popup.
Everytime the validation logic is kicking in, it will hide the Popup, and show it only when got error.

If I execute a lostfocus for the DatePicker with invalid date, to popup error, worked ok.
if I execute the lostfocus twice in rapid succession, the RibbonTab disappear!

I debug through the RibbonTab.OnPropertyChanged event, the disappearance is likely due to the IsOpen been set to False.
Which my custom Popup happened to have the same prop name.
I verify the arguement, and has no idea why this happened....

anyone?

How can i get reference to element inside DataTemplate of a ListView?

2010-02-09T20:00:35Z

Hello,
I've got a ListView with one item in it - TabControl.
I'm trying to get reference to element inside a TabItem (myTxt).

<ListView Name="lstDetailsView">
  <ItemsControl.ItemTemplate>
    <DataTemplate>
       <TabControl Name="MainTabs">
         <TabItem>
            <TextBox Name="myTxt" />
        </TabItem>
       </TabControl>
    </DataTemplate>
  </ItemsControl.ItemTemplate>
</ListView>

Help Please,
Thank you!

Changing the database connection string in a wpf web application

2010-02-05T16:48:04Z

Hi,
I have published a web wpf application and the application in visual studio has a app.config file with the database connection string in. Now that the application is published and ready to go on a new server and pointing to a new database. I try and change the config file within the deployed folder (wpfapp.exe.config) and rerun the application in my browser and the application still seems to be pointing to the original database.

Could someone please help me with this.

Thanks

Simon

How to Access ChildControls Value on SelectionChanged Event of Listbox ?

2010-02-10T07:44:11Z

H! Friends

Thanks Nagaarjun for the reply

I did try above Code but getting exception so sending you my xaml code as a whole with explanations. below than tell me how to do it?

I got this xaml where i am using datatemplate for Listbox in which i have One Image control and another Two are Texblocks as you can see in below Xaml. Now what i want is On Selectionchanged event i want to access the 2nd Texblock with Name "friendID" in my C# Selectionchanged event. How can i get access these controls and their text value in code behind.

<

Grid Margin="15.5,8,8,8">
<Grid.Resources>
<DataTemplate x:Key="ItemTemplate1"
<StackPanel Orientation="Vertical">

<Image x:Name="ImgFriendImage" Source="{Binding Friendimage}" Height="125" Width="125" Margin="10,0,0,0"/>

<TextBlock x:Name="txtFriendfName" Text="{Binding Friendname}" Width="Auto" Height="Auto" FontSize="18.667" Margin="10,0,0,0"/>

<TextBlock x:Name="txtFriendID" Text="{Binding Friendid}" TextWrapping="Wrap" Visibility="Hidden"/>

</StackPanel>

</DataTemplate>

</Grid.Resources>
<ListBox x:Name="frndListBox" ItemsSource="{Binding}" ItemTemplate="{DynamicResource ItemTemplate1}" Margin="0,37.5,0,116.5" HorizontalAlignment="Left" Width="276" d:LayoutOverrides="GridBox" SelectionChanged="frndListBox_SelectionChanged" />
</Grid>

Please do reply me. Thank you

Regards
Vijay Gaur

Non-scrolling object on top of a WPF scrollviewer

2010-02-09T18:43:52Z

Hello

I'm working on a WPF application which has a scrollviewer. This scrollviewer shows multiple rectangles untherneath eachother (with an itemtemplate, one object is called a "theme"). Now I need the name of each "theme" 'floating' on top of each row but they have to stay on the left side of the screen (without moving if i scroll). I tried using an adorner but this didn't give a good result. I can't use a separate bar on the left on the screen, because I'd loose too much space on the UI.

So the problem is I need the name of each theme on top of its own rectangle. The rectangle has to scroll, but not its name so it stays visible. Is there anything I could do within the itemtemplate itself (because that's the only place the name of the 'current' theme is known), or maybe another solution?

Thanks in advance (excuse me for my bad English)
Joachim

Need help implementing find and replace.

2010-02-06T09:06:15Z

I am trying to use the code from the example in this article by Zhou Yong http://shevaspace.blogspot.com/2007/11/how-to-search-text-in-wpf-flowdocument.html How would I use this to find and select text in a richtextbox located on a different window?

How to Access ChildControls Value on SelectionChanged Event of Listbox ?

2010-02-09T13:49:27Z

H! Friends

i got a query with respect to Lsitbox.

i have a Listbox in which i have a Textblock and Image controls as a ListboxItem.
Now what i want is when i select an item in Listbox i want to access the values of Textblock and Image in the SelectionChange Event of Listbox.
Can anybody tell me how can i do that ? How can i access values of texblock and Image on Selectionchange event of Listbox.?

Please do reply friends

Thank You

Regards
Vijay Gaur

WPF UserControls - Size Problem

2010-02-05T09:20:54Z

Hello Everybody

I'm creating my own WPF UserControls and i have some problems with the Size of the Controls in the Designermode.
If i drag one of my UserControls from the Toolbox (by the way: I'm working with VisualStudio 2008 and Windows XP), it has a height of 200 and a width of 120.

This is my XAML file for the CheckBox:

    <Grid Name="grid">
        <Grid.ColumnDefinitions>
            <ColumnDefinition 
                Width="{Binding RelativeSource = {RelativeSource FindAncestor, AncestorType = {x:Type UserControl}}, Path = LeftGridWidth}" />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Label 
            Name="lbl" 
            Content="label" 
            Grid.Column="{Binding RelativeSource = {RelativeSource FindAncestor, AncestorType = {x:Type UserControl}}, Path = LabelColumn}">
        </Label>
        <CheckBox 
            VerticalContentAlignment="Center"
            Name="chk" 
            IsChecked="True" 
            IsEnabled="True" 
            VerticalAlignment="Center" 
            HorizontalAlignment="Left" 
            Grid.Column="{Binding RelativeSource = {RelativeSource FindAncestor, AncestorType = {x:Type UserControl}}, Path = CheckBoxColumn}" 
            Margin="7,0,0,0"
            ></CheckBox>

I have already tried to set the Size of the Grid in this XAML file, but the problem wasn't fixed.
I also tried to create a property in the code behind to set the size, but it didn't help too.

I hope there is someone who can help me to solve my problem..

contextmenu with multiple columns

2010-02-08T17:44:37Z

I want to create a context menu which has multiple columns. It should look like this:

Item_11 | Item_12 | Item_13
Item_21 | Item_22 | Item_23
Item_31 | Item_32 | Item_33

With the MenuStrip from SWF in .NET 2. this was very easy using a Tablelayout. BarBreak in the standard SWF menus does the same.

I tried a Grid inside the ContextMenu, but this does not render correct and highlights all menuitems when the mouse hovers into the context menu.
Any ideas?

Thanks,
Alex

Alexander Gnauck, AG-Software

How to capture a Mouse position on the screen regardless of current form

2010-02-05T08:15:22Z

I need to capture the current Mouse/Cursor(In Case if any document/Notepad open) position regardless of current form. How to capture those coordinates using c#/VB?

WPF TextBox Problem

2010-02-05T08:11:24Z

Hi EveryBody,

I have 2 Prj. 1) WPF Prj 2) VS2008 WinForm contains 1 form with a button

WPF Prj Name: CheckWPFTextBox Window Name: WndMessage123
WPF Prj have 1 TextBox, now I convert the WPF App [Windows Application] into Class Library through Prj Properties change output Type.

Now In Windows Form, I include the Reference of CheckWPFTextBox.dll then from the button click

CheckWPFTextBox .WndMessage123 aa = new CheckWPFTextBox .WndMessage123();
aa.ShowDialog();

Now we can able to write the Text into the TextBox but, When I change the aa.ShowDialog(); into aa.Show(); I can't able to write the Text. Why ? Please give the Solution...

Regards
Ahamed

Performance differences for image scaling when using Image or DrawImage

2010-02-05T07:51:29Z

Hi,

my application needs to scale images, and as most things in WPF there are several options. Two of them are:

1. Use the Image class with a ScaleTransform
2. Use the DrawingVisual class and scale the image with the DrawingContext's DrawImage method.

Are there any performance differences with these two methods, e.g. regarding what's done in SW/HW and what memory needs to be transferred to, or kept in, the display card's memory ?

Regards,
Leif

XBAP limitations

2010-02-05T07:34:40Z

XBAP limitations .NET 3.5

Is those limitations always avalaible for XBAP 4.0?

Regards,

Not Permitted

§ Stand-alone Windows.

§ Most standard dialogs.

§ Interop with Windows controls or ActiveX controls.

§ Access to OS drag and drop.

§ Bitmap Effects (these are deprecated in .NET 3.5 SP1).

§ Shader Effects

§ Direct Database communication

How can I solve the problem when I want to close OSK process?

2010-02-05T07:14:30Z

As I follow this topic to call the OSK keyboard,

I got the problem when I need to close the "OSK".

This is the ERROR that I got.
System.InvalidOperationException was unhandled by user code
Message="Cannot process request because the process has exited." 

This is a code that I used.

private System.Diagnostics.Process _p = null;

private void passwordBox1_GotFocus(object sender, RoutedEventArgs e)
{
if (_p == null)
_p = System.Diagnostics.Process.Start("osk.exe");
else
{
_p.Kill();
_p.Dispose();
_p = null;
}
}

I got a error at

_p.Kill();

line.

Thank in advance

Is it possible to add a MenuStrip to a WPF application?

2010-02-05T15:16:58Z

I'm working in Visual Studio 2010 (Beta 2). I can't find menustrip in the toolbox (I opened "All WPF Controls" in the toolbox. I've done it in the past with a "Forms" application in 2008. Is this changed to a different command or process in 2010? Is it not possible in WPF? Or am I just being the ultimate newbie and missing it? Thanks for any help.

How to let Grid become 3d

2010-02-10T05:44:23Z

How to let Grid become 3d in wpf,
I want make 3D interface ,
who can help me?

WPF Generic Exception

2007-02-06T18:19:10Z

Hello,

I've been doing WPF stuff for a few month now. I still don't know how to take advantage of WPF exception when I'm in debug mode. The exception is too generic:

Cannot create instance of 'Window1' defined in assembly 'TestApp, Version=1.0.2593.18516, Culture=neutral, PublicKeyToken=null'. Exception has been thrown by the target of an invocation. Error in markup file 'Window1.xaml' Line 1 Position 9.

There is infact nothing wrong with line1 Position9...Am I missing an option or something.

Thanks

Houman

How to change TextBox focus color?

2010-02-05T15:30:45Z

I want change TextBox keyboard focus color. Is this possible?

I have try this example (not seems to workin) http://msdn.microsoft.com/en-us/library/ms771588.aspx

Eventhandlers for events raised by controls within DataTemplate

2010-02-09T16:57:43Z

I have a DataTemplate put inside a xaml resource file which does not have a codebehind file (.cs or .vb).

I am using this DataTemplate as a staticresource on ItemTemplate of ListBox which is present on a window.

My DataTemplate has got a Button control inside. If I want to hookup a buttonClick event handler to click event, where do I have to put my eventhandler code. As the DataTemplate does not have a codebehind file, I do not understand what to do?

Any suggestion is really appricated.

Collapsing all treeviewitems except for the selected one.

2010-02-04T21:28:27Z

How can I collapse all treeviewitems except for the selected one?
I don't see any option to collapse or expand an item. I also don't see an option to do it automaticly.

Uppercase on cell DataGrid

2010-01-12T02:29:57Z

Hey people!

Well, I'm trying to force the entry (and the reading) of a WPF DataGrid to be always UPPERCASE. I have searched through the Internet without a good solution... Everything would be programatically set. So far I have this piece of code:

            return new DataGridTextColumn
                       {
                           Header = new TextBlock { Text = columnHeader, ToolTip = toolTipText },
                           Binding = new Binding(metaField.FullName.Replace('.', '_')),
                           IsReadOnly = isReadOnly,
                           CellStyle = style
                       };

What am I missing? the uppercase stuff should be set on CellStyle? If so, how could I implement this?

Thanks in advance!
Milton

add a storyboard to a button for foreground property

2010-02-05T14:45:09Z

Hi,
I would add a storyboard to button when it clicked.
I'm just trying to change the foreground for two seconds.
This is the code I wrote:

<MenuItem>
       <MenuItem.Template>
            <ControlTemplate>
                <!-- In handler click other working code-->
                 <Button Name="executeButton" Click="executeButton_Click" >
                      <Button.Triggers>
                         <EventTrigger RoutedEvent="Button.Click">
                             <BeginStoryboard>
                                <Storyboard>
                                   <ColorAnimation Duration="00:00:02"
                                    Storyboard.TargetProperty="Foreground"
                                            To="Red" />
                                  </Storyboard>
                               </BeginStoryboard>
                           </EventTrigger>
                         </Button.Triggers>
                          Execute
                   </Button>
             </ControlTemplate>
       </MenuItem.Template>
</MenuItem>

The code is not running when I Click on Button.
Is my Button.Trigger in wrong?

Best Regards,
Mauro

Mauro

Having a stackpanel in a listbox with a bound displaymember path

2010-02-01T11:08:47Z

Hi,
I am wondering if anyone can help me, I have a listbox bound to a object and I want the displaymember path to have a stackpanel so that I can show a image and some text.

<ListBox Name="lbWaitingList" DisplayMemberPath="Fullname" ItemsSource="{Binding}" SelectedValuePath="PatientID" />

Thanks

Simon

Can an XBAP WPF application access the url bar

2010-02-08T22:21:53Z

Is there anyway for a WPF to access the internet explorer URL bar and programmatically change the url? Is there such a class to handle that from the .NET framework or is it even possible?

System.Window.SystemColors list? Themes?

2010-02-03T14:39:00Z

Does anyone know about nice themes for WPF, using System.Windows.SystemColors?
Or else I am looking for a list of all the SystemColors and where each of them affects the application.

Any examples, links or just anything is welcommed.

Shimmy

Write over an image in ink canvas

2010-02-10T02:35:21Z

How is it that the the pen/brush on Ink Canvas can also write over an image?

How to achieve that?

Fade in when ItemsSource of ListView (ListBox) is changed

2010-02-10T02:13:57Z

I am trying to accomplish a small visual effect of fading in all items when ItemsSource is changed. This effect should be simple animation that would animate opacity property from 0 to 1 but there are two problems I am not able to solve here:

1. There seems not to be available an event that is raised when ItemsSource property is changed... I saw some sollutions for code-behind file only, but I'd like to accomplish this in pure XAML

2. I am not sure how to execute this animation on the "content" of ListView/ListBox... By content I mean the part of the control where items are shown. Will I have to go with the ControlTemplate here?

Thanks!

Can you query whether a menu popup has opened to the left or right?

2010-02-05T17:20:50Z

I have defined a style for the Menu control that overrides the default style and creates my own popups/etc. I add some HorizontalOffset to the SubMenu popup, however when it's opened to the LEFT, the horizontal offset is incorrect - I need to adjust it in this case.

Is there a way to query whether the popup has opened to the left or right of it's invoker?

Can not set image without getting distorted

2010-02-09T22:32:04Z

Hi,

I'm using .NET 3.5 SP1 and I've a simple problem with images when placed as a content of button or inside a grid. Please run the below code by using a 16x16 image for Open16.png:

<Window x:Class="WpfApp.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
  <Window.Resources>
    <Style x:Key="SmallImageButtonStyle" TargetType="{x:Type Button}">
      <Setter Property="Width" Value="25" />
      <Setter Property="Height" Value="25" />
      <Setter Property="Margin" Value="3 2 3 2" />
      <Setter Property="ContentTemplate">
        <Setter.Value>
          <DataTemplate>
            <Image Source="{Binding}" Width="16" Height="16" />
          </DataTemplate>
        </Setter.Value>
      </Setter>
    </Style>

  </Window.Resources>
  <StackPanel>
    <Grid>
      <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="Auto"/>
      </Grid.ColumnDefinitions>
      <Button Style="{StaticResource SmallImageButtonStyle}" Content="/Resources/Open16.png" />
      <Image Source="/Resources/Open16.png" Width="16" Height="16" Grid.Column="1" />
    </Grid>
    <Button Style="{StaticResource SmallImageButtonStyle}" Content="/Resources/Open16.png" />
    <Image Source="/Resources/Open16.png" Width="16" Height="16" />
  </StackPanel>
</Window>

The result that I see is the images which are directly inside a button or grid are distorted. Except the last image which is directly under the StackPanel. I don't know whether I'm correct for using word distorted; what I mean is the images doesn't show up as the original image. How can I fix this distortion problem?

Thanks in advance

Transparent Windows with regular WindowStyle?

2010-02-09T11:58:56Z

AllowsTransparency says it requires WindowStyle set as None.

Is it possible to have transparency with regular window borders?

Why doesn't string compare work as I expect?

2010-02-09T23:20:45Z

The following four lines of code all evaluate to -1, but I cannot work out why.

int what = "A".CompareTo("M"); // evaluates to -1
what = "a".CompareTo("M");  // evaluates to -1, why?
what = String.Compare("a", "M", StringComparison.CurrentCultureIgnoreCase);  // evaluates to -1
what = String.Compare("a", "M", StringComparison.CurrentCulture);  // evaluates to -1 but should be +1 shouldn't it?

Viv

Disabling V-Sync possible?

2010-02-09T18:08:23Z

Hi there!

For my own performance tests I want to get the maximum possible frame rate at my PC for my WPF app having a Viewport3D element inside. I know that WPF tries to stay as close to 60 fps (or my actual monitor refresh rate!?) if possible (like XNA does), but in XNA I can disable this behaviour with graphics.SynchronizeWithVerticalRetrace = false; Is there something similar within WPF?

As I just use a simple Storyboard-Double-Animation, I tried to set the Storyboard.DesiredFrameRate at 100 e.g. But this has no effect, fps is at around 60. If I set the property to 5, the fps is between 8 and 12 - so at least there is an effect.

Thanks a lot for your help!

Greetings
Archer

Data Template Control Positioning

2010-02-09T15:33:45Z

I have a set of Data Templates based on data type. I also have a Data Template Selector that will select what kind of control to use if a certain data type is detected through a list of variables. My question is this:

Is there a way to set a position (x,y for canvas or row/column for grid) for the dynamically created control? If this is hard to understand, let me know.

Thanks..

How to get location of element on the Ink canvas

2010-02-09T13:41:43Z

Hi,

I want to get the location of a Textbox control which is on the ink canvas. I have tried Inkcanvas.GetLeft(element).. etc but in my case sometime it gives 'NaN'. So I want to know any other method for doing this.

Any idea?

Thanks

A Serious Memory and CPU leak with TextBox base control

2008-06-10T07:08:26Z

Guys,
Let me know if it's not a bug of WPF.

Let's create a project like this:

Main Windows if Window1.xaml with a button that launch second window2.xaml

cs for button in window1.cs

private void Button_Click(object sender, RoutedEventArgs e)
{
Window2 _f = new Window2();
_f.Owner = this;
_f.Show();
}

xaml of window2.xaml

<Window x:Class="WpfApplication1.Window2"

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

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

WindowStartupLocation="CenterScreen"

Title="Window2" Height="300" Width="300">

<Grid>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

</Grid>

</Window>

Build and run .exe file (not in Debug mode).
Click button to show Window2
Open Window Task Manager and set it on top, click on window2 to activate it.
Look for this application in Task Manager process.
Now click in textbox to focus, don't do anything.

Look into Memory of this application in Task Manager, memory will increase by 4K step forever until textbox loose focus.

I test this symptom for many computer and OS, it gives me the same result.

Hope that MSFT guys give this a try and advise for solution.

Thanks for any input.

Duy T. Doan

Using a ContextMenu Resource More Than Once

2010-02-09T00:41:08Z

I have a ContextMenu I created as a resource since the menu is used in different places. When I connect the ContextMenu to the second control I get an error about how It's already connected to a logical parent. While I get why I'm getting the error, I don't see how to work around this short of me creating the menu indevidually for each control.

Bill Gates look out!

TextBox With Predefined Rows And Columns

2010-02-04T13:49:20Z

Team

I need to create a text box of 30 rows and 80 columns i.e. basically fixed content sized TextBox (Not fixed Sized ) fpr any FontFamily and for any FontSize.

I understand that the TextBox Width and Height changes depending up on FontFamily and FontSize and which is okay to me.

Once 80th column is reached I want my text box to wrap to next row. Once 30th row is ended (after Row # 30 and Column#80 ) I want to start at the beginning i.e. row 1 column 1

How can I do this? Is this possible in WPF?

I don't mind using any other control like Rich Text Box or any other WPF control. But that should be an editable text based one

Could any one please shed some light?

Thanks in advance,
Satya

UserControl Binding issues

2010-02-09T14:27:07Z

Hello,

I have created a simple UserControl:

public partial class UserControl1 : UserControl, INotifyPropertyChanged
{
    public UserControl1()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    private string mDisplayName;
    public string DisplayName
    {
        get
        {
            return mDisplayName;
        }
        set
        {
            mDisplayName = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("DisplayName"));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

XAML:

    <Grid>
        <TextBlock Text="{Binding DisplayName}"/>
    </Grid>

Now I create a WPF app to use it (added reference and xmlns:ctl):

    <Grid>
        <ctl:UserControl1 DisplayName="Mike"/>
    </Grid>

Works!

BUT...

If I try to bind the control's DisplayName to something like this:

    <Grid>
        <ctl:UserControl1 DisplayName="{Binding Name}"/>
    </Grid>

I get this error:
A 'Binding' cannot be set on the 'DisplayName' property of type 'UserControl1'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

What can I do to support Binding my Control's properties???

Thanks a lot!!!