WPF Discussion Boards

Hi All,

I have just started playing with this for the first time. I have set up a Class that inherits from ValidationRule and just popped a Console.WriteLine in there for now ... anyone know why this isn't being invoked?

<ComboBox.ItemsSource>
 <MultiBinding Converter="{StaticResource BestGuessFieldLabelDropDownListConverter}"
  UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True">
  <MultiBinding.ValidationRules>
    <l:MappingValidationRule/>
  </MultiBinding.ValidationRules>
  <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type wizard:Wizard}}" Path="DataContext.SelectedDataMapping" />
  <Binding RelativeSource="{RelativeSource self}" />
  <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type wizard:Wizard}}" Path="DataContext.AnalyseResults" />
  </MultiBinding>
</ComboBox.ItemsSource>

Jammer
My Blog | Article(s)

The Validation fires when the binding to Source is being updated. More clearly stated in MSDN,
"Validation usually occurs when the value of a target is transferred to the binding source property. This occurs on TwoWay and OneWayToSource bindings. To reiterate, what causes a source update depends on the value of the UpdateSourceTrigger property, as described in the What Triggers Source Updates section." Link[^]

You might want to have a look here[^] also.

Indeed. Whilst I was debugging I came to this conclusion! Thanks for the reply.

Seems this is not the droid I was looking for ... Smile | :)

Jammer
My Blog | Article(s)

I'm writing a listview:

<StackPanel Margin="8">
  <ListView Name="listView" ItemsSource="{Binding}">
    <ListView.View>
      <GridView>
        <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" />
        <GridViewColumn Header="Age" DisplayMemberBinding="{Binding Age}" />
        <GridViewColumn Header="Grade">
          <GridViewColumn.CellTemplate>
            <DataTemplate>
              <TextBlock Text="{Binding Grade}" Foreground="{Binding GradeColor}"/>
            </DataTemplate>
          </GridViewColumn.CellTemplate>
        </GridViewColumn>
      </GridView>
    </ListView.View>
  </ListView>
</StackPanel>

The foreground color of column 'Grade' is decided by the property GradeColor. It can be Green, Yello and Red.

When I select an item in the listview, the background color of the selected item turned to blue, and the foreground color of the first two column turned to white, but the foreground of the 'Grade' column didn't change to white, which cause the text is unreadable when the item is selected.

Is there any way that I can make the foreground of the 'Grade' column to be white like the other columns when the item is selected? Thx!

I think maybe this[^] will help you. It uses a standard listbox but I think it would work for the listview also.

LinkedIn[^] | Blog[^] | Twitter[^]

Hi Ray, thanks for your reply. I made some changes on the TextBlock and fixed the problem.

<StackPanel Margin="8">
  <ListView Name="listView" ItemsSource="{Binding}">
    <ListView.View>
      <GridView>
        <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" />
        <GridViewColumn Header="Age" DisplayMemberBinding="{Binding Age}" />
        <GridViewColumn Header="Grade">
          <GridViewColumn.CellTemplate>
            <DataTemplate>
              <TextBlock Text="{Binding Grade}">
                <TextBlock.Style>
                  <Style>
                    <Style.Triggers>
                      <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListViewItem}}}" Value="False">
                        <Setter Property="TextBlock.Foreground" Value="{Binding Path=GradeColor}"/>
                      </DataTrigger>
                    </Style.Triggers>
                  </Style>
                </TextBlock.Style>
              </TextBlock>
            </DataTemplate>
          </GridViewColumn.CellTemplate>
        </GridViewColumn>
      </GridView>
    </ListView.View>
  </ListView>
</StackPanel>

I want to do it with out writing a code ( write only in the xaml ).
I remember that i done it once but i dont remember how i did it.

Take a look at Style triggers[^]. Hope that refreshes your memory.

Looking at the your questions, I think you should read a WPF book before you continue with whatever you are doing.

Edit - Also, having your question in the subject of the post is not a good way of posting your questions.. If you want help, learn to respect the people who will be helping you.

i created a silverlight project,and add some TextBox control on it,but i want to format the string which put into the TextBox,for example the length,and ASCII or Unicode,But how could i achieve it,any one help me!
Thank you in advance. Poke tongue | ;-P

Where's the string coming from?

You can do anything you want to the string before setting it as
a textbox's text.

Mark

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

You may want to look into using Converters. Do a msdn search on IValueConvert and you should find examples.

Troy Johnson
www.anothercodesite.com/blog

can we use silverlight in visual studio 2005?

Ramkumar(senior pgmr)

modified on Monday, March 9, 2009 6:22 AM

getramonweb wrote:
can we use silverlight in visual studio 2005?

Probably, but you'll have to do everything manually - there won't be any
app/library templates or intellisense.

If you Google "silverlight 2 visual studio 2005" there's some possibilities -
some are old and I don't know if any work for Silverlight 2 RTM.

Why not get a free edition of VS 2008: Microsoft Visual Web Developer 2008 Express with SP1[^]

Then you can use all the latest stuff for Silverlight 2 as listed here:
Get Started Building Silverlight 2 Applications[^]

Mark

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

We have used C1DateEdit control(Component One third party control) in WPF application and it has some issue with it.

Please find below the scenario and the issue.

Scenario 1:

Step 1 : Create a WPF-Windows application and add Window1.xaml .

Step 2 : Add C1DateEdit control in WindowsFormsHost element.

Step 3 : Execute the application.

Step 4 : Click on the dropdown of the DateEditControl. It throws the below exception.

Scenario2:

Step 1 : Create a WPF-Windows application and add Window1.xaml .

Step2: Create a usercontrol(ucDateTimePicker.cs) by adding C1DateEdit control.

Step3: Add the user control in WindowsFormsHost element of Window1.xaml.

Step 4 : Execute the application.

Step 5 : Click on the dropdown of the DateEditControl. It throws the below exception.

Expected Result:

When click on the dropdown of the DateEditControl, it should drop the calendar.

Exception:

System.NullReferenceException: Object reference not set to an instance of an object.

at C1.Win.C1Input.C1DropDownControl.OpenDropDown()

at C1.Win.C1Input.C1DropDownControl.a()

at C1.Win.C1Input.C1DropDownControl.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Note: The same scenario works well with Windows application of visual studio 2005.

Kindly provide the idea/solution for this issue as early as possible.

Have you had a thought that this could be an overlay issue ? When your Calendar control is trying to open it is entering the WPF space and hence must be dying out.

Did you ask this in the Component1 forum ?

jaylinuxguru wrote:
Kindly provide the idea/solution for this issue as early as possible.

That's simple. Raise this with the company that supplied the product. They are the ones who ultimately get paid to fix bugs. Posting this on a random site does nothing to help improve the quality of the control - Component1 support staff aren't monitoring CP hoping to see support calls coming in here.

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

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

Hi,

I have a contextmenu defined and binded the IsEnabled property for some items. This is (part of) the code:

<Window x:Class="PAP.PhotoAnnotation"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:PAP.Controls"
WindowState="Maximized"
Title="{Binding Path=Title, ElementName=canvasContainer, Mode=OneWay}">

<Window.Resources>

<controls:ConverterActiveElement x:Key="convActiveElement"/>
</Window.Resources>

<Grid>
<DockPanel>
<ScrollViewer Name="container" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
<controls:CanvasContainer x:Name="canvasContainer" Background="LightGray">
<controls:CanvasContainer.ContextMenu>
<ContextMenu x:Name="contexMenu">
<MenuItem Header="Undo"/>
<MenuItem Header="Redo"/>
<Separator/>
<MenuItem Header="Cut"/>
<MenuItem Header="Copy"/>
<MenuItem Header="Paste"/>
<MenuItem Header="Delete"/>
<Separator/>
<MenuItem Header="Select All"/>
<Separator/>
<MenuItem Header="Bring Forward"
Click="BringForward_Click"
IsEnabled="{Binding Path=ActiveElement, ElementName=canvasContainer,
Mode=OneWay, Converter={StaticResource convActiveElement}}"/>
<MenuItem Header="Send Backward"
Click="SendBackward_Click"
IsEnabled="{Binding Path=ActiveElement, ElementName=canvasContainer,
Mode=OneWay, Converter={StaticResource convActiveElement}}"/>
<Separator/>
<MenuItem Header="Properties"/>
</ContextMenu>
</controls:CanvasContainer.ContextMenu>

</controls:CanvasContainer>
</ScrollViewer>
</DockPanel>
</Grid>
</Window>

The problem is that this does not work. It just allways stays enabled. I also binded some buttons in a toolbar and menu-items in a normal menu EXACTLY the same and that works perfect Confused | :confused:

!

Anyone an idea of what is wrong?

Thx!

ContextMenu is not part of Visual and Logical tree. You will need to do something like this[^] ?

Good People,

Quick question. I have a collection of objects which will, within each, have a series data that needs to be displayed. Say for example, I have a GasStation object which I will put in an observable collection called AllGasStations. As you can imagine, I need to track several things each day, e.g. customers, gallons used, profit, items sold - which I will put in an object called DailyActivity and then place that into an observable collection called AllDailyActivity.

I am using a XamChart (infragistics) that needs a series. So, does WPF support binding to a collection within a collection. I want to display a chart for each day, for each gas station. So, can it bind to the gas stations collection, then each chart that comes up can bind to the AllDailyActivity collection within the GasStation Collection.

Using a listbox, I am thinking that I would use the gas station object as the data context, bind the gas station name to the template's gas station name, then bind the chart to the AllDailyActivity collection within the gas station object. Any thoughts?

Thanks for any help or information you can provide.

Blitz

I have not worked with XamChart. As far WPF is concerned it would have no problems binding to a collection in a collection. For WPF, it would just be a property if used in the correct way. In your example, the listbox items will be the Gas Statiion objects and if you want the currently selected Gas Station's AddDailyActivity list, it should be as simple as "{Binding ElementName=yourListBox, Path=SelectedItem.AllDialyActivity}".

Does anyone have an opinion on WFP versus Pentaho in terms of cabability to present data?

I understand very little about Pentaho, but I am aware (from their website) that they allow ad-hoc reporting along with a large architecture of other goodies.

So far, I have read the first few chapters of the Pro WPF for C# book. Also, dev'd a few small Silverlight apps for fun.

I would like to get some feedback concerning any NOTABLE benefits in performance, flexibility, and bells and whistles that WPF might provide over Pentaho.

Or, would WPF make a nice COMPLEMENT to Pentaho?

Thanks.

Pentaho specialise in reporting applications whereas WPF is the next generation of building Windows applications. You might as well ask how apples compare to chairs. If you want to do dedicated reporting, use a dedicated reporting application. If you want to build software, use something that was designed for building applications.

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

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

Then let's say we are adding decor to a room....and the apple is among fruits in a basket.

I'm looking for a statement similar to "WPF's close ties to Direct3D/DirectX provides more advanced rendering capabilities, useful in presenting animated graph plots."

Another example, on codeproject or somewhere else, I came across some app done in WPF that provides the drill-down capability on maps similar to maps.google.com.

Hi im just beggining to learn wpf and C#, my problem is probably the simplest thing in the world except for me... I add an image to my project and then i try to use it as a background..

[Grid>
Grid.Background>
<imagebrush imagesource="background.jpg" tilemode="FlipXY" stretch="None" viewbox="0,0,1,1" viewport="0,0,0.3,0.3">
Grid.Background/>
grid.>

i keep getting an error that says that my image is not part of the project..
i've added it as a resource and made sure that it's build action is set to resource and it still doesnt work,, can anyone please help me (teach me) how to make an image part of my project..

any help will be much appreciated.. thanks

I guess you need to set it to content.See if this[^] helps.