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Ravi Bhavnani wrote: it seems there's probably a smarter solution
My first reaction to that was WTF are you doing, so I agree with you that there should be a better way.
I would look at your data source, the list of employees, that you bind to your datagrid. This probably comes from a database via a query so why not include the jobname in that original query and bind to that field.
I don't even bother binding the id fields into the datagrid as you should never actually touch the visual object when processing. You should ALWAYS use the underlying data object that it bound to the datagrid.
Never underestimate the power of human stupidity
RAH
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My example was intentionally contrived. In doing so, I realize I left out some key information. 
Assume I want to be able to display and edit the employee's job (by selecting it from an AutoCompleteBox in a GridTemplateColumn). I'll need a JobsProvider to populate the AutoCompleteBox and was going to use the scheme I described in my original post to display the selected (and initial) job in the TextBlock in the CellTemplate. Does that sound right?
/ravi
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Ravi Bhavnani wrote: Assume I want to be able to display and edit the employee's job
Something I almost never do in a grid, inline editing is one of the nastiest operations to code. However can you not use an edittemplate with a combobox.
Never underestimate the power of human stupidity
RAH
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If you are using IE9, try running your application in "Compatibility View".
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I think the browser cached that page. You need to clear cache. I know that FireFox users can press CTRL+R to reload. I do not know for chrome or IE
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I have a silverlight application in witch the user clicks the "Record" button and his/her voice is captured to be saved later.
But when the "Record" button is pressed the following exception is thrown when it attempts to Start capturing audio.
System.Exception was unhandled by user code
Message=Class not registered (Exception from HRESULT: 0x80040154)
StackTrace:
at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.CaptureGraph_Start(CaptureSource Source)
at System.Windows.Media.CaptureSource.Start()
at AudioRecorder.MainPage.Record_Click(Object sender, RoutedEventArgs e)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
InnerException:
What is the solution to this problem?
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Based on the error, something happened in the component. So reinstall the component or register the dll using REGSVR32.
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Is there a way to make radio button groups behave as they do in Windows Forms? By that I mean when you hit tab, the focus moves to the next control following the group rather than the next radio button in the group and when you use the up and down keys, the checked state follows the selected radio button rather than having to hit space to select it. Thanks.
Eric
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The arrow keys one is a simple fix. Just add a trigger that targets the RadioButton control. Something like:
<Style TargetType="{x:Type RadioButton}">
<Style.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Trigger.Setters>
<Setter Property="IsChecked" Value="True" />
</Trigger.Setters>
</Trigger>
</Style.Triggers>
</Style>
As for the tab one... thats a little bit trickier. I don't really feel like writing code on a Saturday night, but if I was, I'd probably derive a class from RadioButton, override the key down and if its a tab, I'll search for the next control thats either not a radio button or not in the group. Keep in mind that shift-tab should work the other way . Previous control I mean. I don't think you can fix that in xaml.
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Hi,
I have a simple grid which contains many controls.This grid is defined in resource disctionary. I wanted to hide particular grid in code. But I am not able access this grid in the code as this is defined in resource dictionary. How do I hide this grid..?
thanks..
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You should ideally bind the visibility of the grid and control this via your view model.
Set the binding in your style, the datacontext should be the view model and you should be able to control the visibility via a property.
This[^] simple example should help you out.
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Dear all
I'm fairly new to WPF and I think i'm trying to do something nonstandard, but maybe you can help me:
what i'm trying to do is the following:
in my code behind i have a collection (List) of a object of type Period (List<period> periods)
the object Period itself has various properties, of which some are Lists as well (Public List<string> FileReferences).
In my UI i have a datagrid, which I want to bind to these properties of one object Period in the list with Periods.
how can i dynamically bind my datagrid, two way?
thanks
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If I get you correctly, you have an Object Period, which has a property that returns a List<FileReference> called FileReferences. Now you want to bind a DataGrid to the FileReferences property of a specific Period.
To accomplish this you would need a Property in your code behind that returns a Period object (call this SelectedPeriod). Then you can bind the DataGrid's ItemsSource property to SelectedPeriod.FileReferences.
I would just like to say, that if you have access to the models, then you should change your collections to return ObservableCollections rather than Lists. ObservableCollections provide notifications about any additions, deletions or other changes, which the bound controls can use to automatically update their display.
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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Dear experts,
Currently i'm trying to mimic the behavior of the ContentControl Control in a FlowDocument environment. I like the ContentControl because it allows to display content in a different template based on the content's type. E.g.:
<ContentControl Content={Binding}/> will use DataTemplates defined higer up in the XAML in a ResourceDictionary:
<DataTemplate DataType={x:Type local:Person}>...</DataType>
<DataTemplate DataType={x:Type local:Pet}>...</DataType>
I already found Create Flexible UIs With Flow Documents And Data Binding. As a start I altered the ItemsContent as follows:
public class TemplatedContent : Section
{
private static readonly DependencyProperty ContentProperty = DependencyProperty.Register("Content", typeof(object), typeof(TemplatedContent), new PropertyMetadata(OnContentChanged));
private static readonly DependencyProperty TemplateProperty = DependencyProperty.Register("Template", typeof(DataTemplate), typeof(TemplatedContent), new PropertyMetadata(OnTemplateChanged));
public TemplatedContent()
{
Loaded += TemplatedContent_Loaded;
}
private void TemplatedContent_Loaded(object sender, RoutedEventArgs e)
{
GenerateContent(Template, Content);
}
public object Content
{
get { return GetValue(ContentProperty); }
set { SetValue(ContentProperty, value); }
}
public DataTemplate Template
{
get { return (DataTemplate)GetValue(TemplateProperty); }
set { SetValue(TemplateProperty, value); }
}
private void GenerateContent(DataTemplate template, object content)
{
Blocks.Clear();
if (template != null && content != null)
{
FrameworkContentElement element = Helpers.LoadDataTemplate(template);
element.DataContext = content;
Blocks.Add(Helpers.ConvertToBlock(content, element));
}
}
private void GenerateContent()
{
GenerateContent(Template, Content);
}
private void OnContentChanged(object newValue)
{
if (IsLoaded)
GenerateContent(Template, newValue);
}
private void OnTemplateChanged(DataTemplate newValue)
{
if (IsLoaded)
GenerateContent(newValue, Content);
}
private static void OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TemplatedContent)d).OnContentChanged(e.NewValue);
}
private static void OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((TemplatedContent)d).OnTemplateChanged((DataTemplate)e.NewValue);
}
}
As you can see it's a verly basic peace of code and it works as expected when i use it in the following manner:
<FlowDocument>
<local:TemplatedContent Content={Binding}>
<local:TemplatedContent.Template>
<DataTemplate DataType={x:Type local:Person}>...</DataTemplate>
</local:TemplatedContent.Template>
</local:TemplatedContent>
</FlowDocument>
This is all well but to support multiple templates for different content types i will need to define the DataTemplates in a resource dictionary:
<FlowDocument>
<local:TemplatedContent Content={Binding}>
</local:TemplatedContent>
</FlowDocument>
and higer up in a resource dictionary:
<DataTemplate DataType={x:Type local:Person}>...</DataTemplate>
Now, the TemplatedContent is unable to find the DataTemplate. How is this possible? If I understand the theory around DependencyProperty correctly it should look in the xaml tree for <datatemplate> entries that match the type of the content right? It doesn't. When setting a breakpoint on line:
private static void OnTemplateChanged
it's never called.
I hope you experts can help me further with this!
Lots of thanks in advance!
edit: sorry for the layoutbugs, i hope it's fixed now
modified 8-Dec-11 14:13pm.
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How to make muti-geometryModel3D to make different colors in different trangles ? i may wanna build many trangle but must with different color , but i don't know how to do it . if someone knows , please tell me how to do , thank you very much
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Hey guys,
I am using the following codes to draw a line, how can I extend it to draw multi-lines ( i.e. 10 lines or 100 lines )
Line V_Line = new Line();
V_Line.Stroke = System.Windows.Media.Brushes.Gray;
V_Line.StrokeThickness = 4;
V_Line.X1 = 0;
V_Line.Y1 = 0;
V_Line.X2 = New_Figure_Canvas.Width;
V_Line.Y2 = 0;
New_Figure_Canvas.Children.Add(V_Line);
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Put it in a loop. This will draw 10 lines at 10 pixel intervals on your canvas:-
for (int i = 0; i < 10; i++)
{
Line V_Line = new Line();
V_Line.Stroke = System.Windows.Media.Brushes.Gray;
V_Line.StrokeThickness = 4;
V_Line.X1 = 0;
V_Line.Y1 = i*10;
V_Line.X2 = canvas1.Width;
V_Line.Y2 = i*10;
canvas1.Children.Add(V_Line);
}
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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but if I increase the 10 to 100 then for 100 times I will make an instance of Line, is it optimal or there is another way ?!
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That is how loops work. Don't be afraid to try.
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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Thanks
I tried it before, but I was wondering if there is any better ( optimal ) way of doing this
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As you are going to be composing a large(?) number of graphic objects, I would suggest that you look to use a geometry instead. Basically geometries inherit from Freezable, which means that they can be frozen, which helps to increase performance. The item you are looking for is the LineGeometry class.
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I have a collection of FolderModel and FileModel object. The FolderModel has 2 list properties holding FolderModels and FileModels. A folder can contain a list of Folders and/or a list of Files. It's populated like this:
RootFolder
|_Folder_A
|_ File_1
|_ File_2
|_ Folder_A1
|_ File_5
|_ File_6
|_ Folder_A2
|_Folder_B
|_ File_3
|_ File_4
|_ Folder_B1
I'm trying display te data in a treeview. My templates are:
<HierarchicalDataTemplate DataType="{x:Type models:FolderModel}"
ItemsSource="{Binding Path=Folders}">
<StackPanel Orientation="Horizontal"
Margin="2">
<TextBlock Text="{Binding Path=Caption}"/>
</StackPanel>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type models:FileModel}">
<StackPanel Orientation="Horizontal"
Margin="2">
<TextBlock Margin="0,0,5,0">
<Hyperlink NavigateUri="{Binding Caption}"
Foreground="#0C2DAA"
Command="{Binding SelectedLinkCommand}">
<InlineUIContainer>
<TextBlock Text="{Binding Caption}" />
</InlineUIContainer>
<Hyperlink.Style>
<Style TargetType="Hyperlink">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="False">
<Setter Property="TextDecorations" Value="{x:Null}" />
</Trigger>
</Style.Triggers>
</Style>
</Hyperlink.Style>
</Hyperlink>
</TextBlock>
</StackPanel>
</DataTemplate>
When I run it, all I see are the folders. The files are not showing up. What am I doing wrong?
Everything makes sense in someone's mind
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The target objects need to be the same type. I use a UINode object that has all the properties needed to service a treeview node, Label, Tag and List<uinodes> being the minimum but I have order and image fields as well.
I then load the top nodes with the text I need to see and put the record (folder or file) object into the tag property (which is object).
Then for each top node I load the ChildNodes collection. This is a simple recursive excercise.
When I need to work with the content of the node I check the type of the object in the tag property first.
Never underestimate the power of human stupidity
RAH
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