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Hello all,
I have a series of "drawing" objects that hold some application specific data alongside an image. These objects (or at least their dates) are displayed in a listbox, when an item is selected it's image should be generated and displayed in another part of the grid. It does however not appear.
Here is some code:
<ListBox Grid.Column="0" ItemsSource="{Binding Source={StaticResource _Settings}, Path=ImageCollection.CurrentList}" Name="DrawingsList">
<ListBox.ItemTemplate>
<DataTemplate>
<Label Content="{Binding DateTime}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Image Grid.Column="1" Source="{Binding ElementName=DrawingsList, Path=SelectedItem.ActualImage}" Width="500" Height="500"/>
<!--<Label Grid.Column="1" Content="{Binding ElementName=DrawingsList, Path=SelectedItem.DateTime}"/> -->
And behind:
private System.Drawing.Image _ActualImage;
public System.Drawing.Image ActualImage
{
get
{
if (_ActualImage == null)
{
_ActualImage = GenerateImage();
}
return _ActualImage;
}
}
private System.Drawing.Image GenerateImage()
{
Bitmap bmp = new Bitmap(500, 500);
Graphics G = Graphics.FromImage(bmp);
G.Clear(Color.Red);
G.Save();
return bmp;
}
The commented label in the WPF that just displays the datetime property of the object works perfectly, so why doesn't the image ?
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You can't use a System.Drawing.Image (which is GDI) as the Source of a WPF Image...
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Hi,
can any one tell me how to change the color of a specific row in a listbox.
This is my xaml code.
<ListBox x:Name="lbDirectiveList" ItemsSource="{Binding}" SelectionChanged="LbDirectiveListSelectionChanged" MaxHeight="200" SelectionMode="Single" ScrollViewer.VerticalScrollBarVisibility="Auto">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="4">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="25" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Name="tbDirName" Text="{Binding Path=DirectiveName, Mode=TwoWay}" Grid.Column="0" FontWeight="Bold" MinWidth="200"/>
<TextBlock Text=" - " Grid.Column="1"/>
<TextBlock Grid.Column="2" Name="tbDirDesc" Text="{Binding Path=DirectiveDescription, Mode=TwoWay}" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
List<ObservableCollection> list = new List<ObservableCollection>();
lbDirectiveList.ItemsSource = list;
when the user click on a checkbox(set color) in my application, it has to change the color of that selected item from the listbox, so how to do it..
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Make a class that implements the INotifyPropertyChanged interface and use a collection of that class to bind to the listbox.
Create a property "color" in that class and throw the property changed event in the setter.
In the datatemplate of the listbox, bind the color property to the background of the item.
Make sure you have a reference to the selected item of the listbox.
When the checkbox is clicked, set the new color to the "color" property of the selected item.
Done.
That's how I would do it anyway...
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We are writing a Silverlight 4.0 application which is actually a conversion of ASP to this application.
In one block of forms we have a datagrid at the top of the form. The remainder of the form (each grouped in sections) can only be visible when the datagrid's selected index is > 0.
So I know I have to bind the Visibility attribute and I know I have to use a BooleanToVisibilityConverter. What I'm not sure about is that I cannot seem to find just the right statement to get addressability to the datagrid and its' properties leastwise how to do the comparison.
I'm thinking I may have to write my own Converter to do the comparison logic but I still have to know how to define the datagrid as the object being passed to the converter.
Any help would be greatly appreciated!!!
Thanks much,
Michael
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How about a IndexGreaterThanZeroToVisibilityConverter...
public class IndexGreaterThanZeroToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return ((int)value > 0) ? Visibility.Visible : Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
(Note: ListBox used here for simplicity...works the same with a DataGrid)
<UserControl.Resources>
<local:IndexGreaterThanZeroToVisibilityConverter x:Key="IndexGreaterThanZeroToVisibilityConverter" />
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<ListBox Name="listBox1" Grid.Row="0" Height="100" >
<ListBoxItem Content="Item 1" />
<ListBoxItem Content="Item 2" />
<ListBoxItem Content="Item 3" />
</ListBox>
<Grid Grid.Row="1" Visibility="{Binding ElementName=listBox1, Path=SelectedIndex, Mode=OneWay, Converter={StaticResource IndexGreaterThanZeroToVisibilityConverter}}" >
<TextBlock Text="This area is visibile!" FontSize="20" HorizontalAlignment="Center" VerticalAlignment="Center" />
</Grid>
</Grid>
Mark Salsbery
Microsoft MVP - Visual C++
modified on Thursday, May 19, 2011 11:43 PM
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Hey Mark!
You're okay for a C++ guy. 
So I implemented my convert. check
Then I implemented the binding. check
Added the namespace for local. check
Then did local: my converter was visible and got it set with a key. check
Ran the solution and got this error at compile time.
Error 1 The tag 'DataGridVisibilityConverter' does not exist in XML namespace 'clr-namespace:CNRPGlobal.Converters; assembly=GlobalLibraryDefinitions'.
So how is it I can type local: and see my class library. Yet when I compile XAML cannot? I confirmed it is public.
Here is a snippet of what I've got:
xmlns:local="clr-namespace:CNRPGlobal.Converters; assembly=GlobalLibraryDefinitions"
xmlns:sys="clr-namespace:System;assembly=mscorlib">
<UserControl.Resources>
<ResourceDictionary x:Key="styles" Source="/GlobalLibraryDefinitions;component/Themes/Generic.xaml" />
<local:DataGridVisibilityConverter x:Key="VisibilityConverter" />
</UserControl.Resources>
And the consumption of the converter:
<cnrp:FormSection x:Name="designSection" Title="Design Section" DataContext="{Binding CurrentDesign, Mode=TwoWay}"
Visibility="{Binding ElementName=dgDesigns, Path=SelectedIndex, Mode=OneWay, Converter={StaticResource VisibilityConverter}}">
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From what you've shown I can' see the problem.
Try a rebuild?
The namespace and assembly are correct and you have a reference to that assembly?
Also, "local" maybe not a good name for a namespace in a separate assembly 
Mark Salsbery
Microsoft MVP - Visual C++
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Mark,
OMG -- the initial problem was I had a space between the namespace and the assembly name
But now I'm getting a runtime error
Local values are not allowed in resource dictionary with Source set [Line: 14 Position: 46]
It is pointing at my styles object! 
modified on Friday, May 20, 2011 2:15 PM
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Patterns are for programmers....the compiler doesn't know anything about MVVM.
If there's a class called DataGridVisibilityConverter in a namespace CNRPGlobal.Converters in an assembly GlobalLibraryDefinitions then it should work.
Mark Salsbery
Microsoft MVP - Visual C++
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Try a USerControl from scratch, totally stripped down..does this compile??
<UserControl x:Class="SilverlightTester.ConverterTestPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:gspace="clr-namespace:CNRPGlobal.Converters;assembly=GlobalLibraryDefinitions"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<UserControl.Resources>
<gspace:DataGridVisibilityConverter x:Key="VisibilityConverter" />
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
</Grid>
</UserControl>
Mark Salsbery
Microsoft MVP - Visual C++
modified on Friday, May 20, 2011 2:25 PM
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got past the compile issue. It was the space just before assembly:!!!
Now I just have to figure out my runtime issues with the resource dictionary.
It doesn't like having that resource along with a ResourceDictionary entry! WTF???
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Hmm CodeProject editor must have added the space - there's no space in my code here!
Mark Salsbery
Microsoft MVP - Visual C++
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WOOHOO!!!
Got a clean compile AND a good XAML parse. Here is the final results I had to implement!
xmlns:g="clr-namespace:CNRPGlobal.Converters;assembly=GlobalLibraryDefinitions"
xmlns:sys="clr-namespace:System;assembly=mscorlib">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/GlobalLibraryDefinitions;component/Themes/Generic.xaml" />
<ResourceDictionary>
<g:DataGridVisibilityConverter x:Key="VisibilityConverter" />
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
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Awesome! Was just about to send this...
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/GlobalLibraryDefinitions;component/Themes/Generic.xaml" />
</ResourceDictionary.MergedDictionaries>
<converters:IndexGreaterThanZeroToVisibilityConverter x:Key="IndexGreaterThanZeroToVisibilityConverter" />
</ResourceDictionary>
</UserControl.Resources>
Mark Salsbery
Microsoft MVP - Visual C++
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It appears that the Storyboard won't accept a new RepeatBehavior structure once the animation has already begun.
I want to have an animation repeat endlessly, until the user clicks the window.
I have the animation RepeatBehavior set to Forever in the XAML. How do I stop the animation once it's begun?
The difficult we do right away...
...the impossible takes slightly longer.
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Change the RepeatBehavior and call Stop()
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Thanks.
The difficult we do right away...
...the impossible takes slightly longer.
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A Stop() call on the StoryBoard should be sufficient. You don't need to do anything else.
The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.
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Another alternative maybe...all in XAML...
<Grid Name="theGrid" Background="SteelBlue" >
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.Loaded">
<BeginStoryboard x:Name="gridBeginStoryboard" >
<Storyboard>
<DoubleAnimation Storyboard.TargetName="theGrid"
Storyboard.TargetProperty="Opacity"
From="1.0" To="0.0" Duration="0:0:2"
AutoReverse="True" RepeatBehavior="Forever" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger SourceName="theGrid" RoutedEvent="Grid.MouseLeftButtonDown">
<StopStoryboard BeginStoryboardName="gridBeginStoryboard" />
</EventTrigger>
</Grid.Triggers>
</Grid>
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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u can create a doubleanimation type, and then set douleanimation type equals(storyboard)Findresource("name of storyboard");
and doubleanimation.stop()..
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Hi All,
I am running code from http://msdn.microsoft.com/en-us/library/gg197425(v=XNAGameStudio.35).aspx[^].
i am able to compile and run the code successfully but I am not able to see any 3D objects on screen.
My System details as follows.
System : Widnows XP with 2GB RAM
Visual Studio 2010 SP1
DirectX SDK 9.0
SilverLight 5.0 Beta
XNA Framework.
If someone passed from same that please help me.
Regards
Rushi
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First thing, try to check if the link to the sample provided on the website runs on your machine.
The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.
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hello, I'm a WPF newbie
i have a class called Employee that has a single property Name, when i try to bind it to TextBlock, nothing happens...
what am i doing wrong ?
public MainWindow()
{
InitializeComponent();
Employee emp = new Employee("lolo");
grd.DataContext = emp;
}
<Window x:Class="WpfTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid Name="grd">
<TextBlock Text="{Binding Path=Name}" Name="textBlock1"></TextBlock>
</Grid>
</Window>
your help is very much appreciated 
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Could you please supply the code for your Employee class? There's no problem with your XAML or the MainWindow class.
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