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• Silverlight HeaderStyle Broken?

  - by zburns

  Why does this not render correctly? <sdk:DataGrid AutoGenerateColumns="False" Height="438" HorizontalAlignment="Left" Margin="12,183,0,0" Name="dataGridWorkingGrid" VerticalAlignment="Top" Width="856" ClipboardCopyMode="IncludeHeader" CanUserReorderColumns="False" CanUserResizeColumns="False"> <sdk:DataGrid.Columns> <sdk:DataGridTextColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="BatchID" IsReadOnly="True" Visibility="Collapsed" Width="Auto" Binding="{Binding BatchID}"/> <sdk:DataGridTextColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="Transaction Date" IsReadOnly="True" Width="100" Binding="{Binding TransactionDate, StringFormat='MM/dd/yyyy'}"> <sdk:DataGridTextColumn.HeaderStyle> <Style TargetType="TextBlock"> <Setter Property="TextWrapping" Value="Wrap"/> </Style> </sdk:DataGridTextColumn.HeaderStyle> </sdk:DataGridTextColumn> <sdk:DataGridTextColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="Merchant Name" IsReadOnly="True" Width="200" Binding="{Binding MerchantName}"/> </sdk:DataGrid.Columns> </sdk:DataGrid>

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• WPF: Text wrapping not working

  - by Ben

  I've got a grid defined simply: <Grid Margin="0,5,0,0"> <Grid.ColumnDefinitions> <ColumnDefinition Width="50"></ColumnDefinition> <ColumnDefinition Width="50"></ColumnDefinition> <ColumnDefinition Width="48"></ColumnDefinition> <ColumnDefinition Width="Auto"></ColumnDefinition> </Grid.ColumnDefinitions> Then I'm trying to bind some content like this: <TextBlock TextWrapping="Wrap" Grid.Column="3" Text="{Binding Text}"> Set up like this, the text won't wrap. It simply expands the column to fit the text. If I set the Width to a fixed amount on the last column, wrapping works as expected. The problem there is that if the user widens the window, the column stays at a fixed size. How can I get the column to size dynamically with the width of the grid, but still wrap the text within it?

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• Freezable DataContext

  - by grid-wpf-architect

  Hi, I have a customControl like ListView and I need to bind the sub property of my Custom Control to the visual tree element like below, <StackPanel> <TextBlock Text="Test" x:Name="txtBlock" /> <local:MyControl> <local:MyControl.Items> <local:MyControlItem Value ="{Binding ElementName=txtBlock, Path=Text}" /> </local:MyControl.Items> </local:MyControl> </StackPanel> I can access the object using Freezable object as the resource, but i want to inherit Freezable in my MyControlItem and access the Visual Tree.

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• ValueConverter not being invoked in DataTemplate binding

  - by unforgiven3

  I have a ComboBox that uses a DataTemplate. The DataTemplate contains a binding which uses an IValueConverter to convert an enumerated value into a string. The problem is that the value converter is never invoked. This is my XAML: <ComboBox ItemsSource="{Binding Path=StatusChoices, Mode=OneWay}"> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Converter={StaticResource StatusToTextConverter}}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> Is my binding not correct? I thought this is how one implicitly binds to the value a DataTemplate is presenting. Am I wrong?

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• WPF MVVM Property Change Animation

  - by cjibo

  I am looking for a clean way to start an animation that will have dynamic values. Basically I want to do an animation where an element changes width based on the data of another element. Say I have a TextBlock that's Text Property is Binding. When this property changes I want a visual element say a Rectangle for our sake to do a DoubleAnimation changing the width from previous value to the new value. I am trying to stay away from putting code in my view if possible. I've looked into DataTriggers but they seem to require that you know what the value would be such as an Enum. In my case it is just the value changing that needs to trigger a storyboard and the animation would need to start at the current(previous) value and move nicely to the new value. Any ideas. Maybe I just missed a property.

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• collapsible grid in Silverlight 4

  - by prince23

  hi, I want to create a collapsible grid in Silverlight 4. once user clicks on row of the datagrid if that row has any child row it should be shown. if again user clicks the same row should hide the child row what was shown eariler. right now i am able to show data in datagrid once the user clicks any row i am able get the id of the row what i have clicked and go to DB and get the result. but how will i again bind the new datatable to datagrid agin. below the row what i have clciked private void dgData2_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { if (dgData2.SelectedIndex >= 0) { //Get Selected Row var element = (TextBlock)dgData2.Columns[0].GetCellContent(dgData2.SelectedItem); } } i am new to silverlight please let me know any code that can help e out Thanks in advance for any help prince

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• How do you set the height of an object to Auto when Animating in WPF?

  - by discwiz

  Tring to animate the expanding and contracting of a WPF Expander in .Net 4.0 using PowerEase. The animation works except I have to hardcode the height or bind to the height of an object in the expander which does not give the desired height. I need to set the "To" of the expander to Auto in animation. <Storyboard x:Name="myStoryboardContract" x:Key="myStoryboardContract"> <DoubleAnimation From="{Binding ElementName=MapsExpander, Path=ActualHeight}" To="30" Duration="00:00:3" Storyboard.TargetName="MapsExpander" Storyboard.TargetProperty="Height"> <DoubleAnimation.EasingFunction> <PowerEase Power="20" EasingMode="EaseOut"/> </DoubleAnimation.EasingFunction> </DoubleAnimation> </Storyboard> </Expander.Resources> <TextBlock x:Name="Text1" Text="Hi this is nothing but junk."/> </Expander>

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• Unit testing custom controls in Silverlight

  - by Hrvoje

  I have several custom controls (some kind of frames for content and layout management, like wrap panel), and would like to write unit tests for them. It's hard to find any good examples except Silverlight control toolkit, which has some helper classes to do unit tests and it's quite complicated. For MVVM classes it's easy to write tests because they don't use SL dependency system and infrastructure. Questions: how to unit test DepedenyProperty, what do I need to test how to test attached property do I test bindings with theme or UserControl, like simple textblock content binding, or command/event binding in MVVM with UserControl what else do I test in my custom controls, beside my business logic any good tutorial to achieve tests like those in control toolkit How do I start? Is SL controls toolkit only option for learning? For testing framework i'm using one from control toolkit, and for continuus integration on TFS build server I planned to use Statlight (from codeplex). Any advice on that?

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• .NET: Best way to execute a lambda on UI thread after a delay?

  - by Scott Bussinger

  I had a situation come up that required running a lambda expression on the UI thread after a delay. I thought of several ways to do this and finally settled on this approach Task.Factory.StartNew(() => Thread.Sleep(1000)) .ContinueWith((t) => textBlock.Text="Done",TaskScheduler.FromCurrentSynchronizationContext()); But I'm wondering if there's an easier way that I missed. Any suggestions for a shorter, simpler or easier technique? Assume .NET 4 is available.

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• Arbitrary Header content for each row in WPF datagrid

  - by tk

  I'm trying to put row header text based on a converter function of the index of the row. I found a way to bind to the datagridrow like below, but i can't find how to get the row index of the datagridrow object. <DataTemplate x:Key="MyRowHeaderTemplate" DataType="DataRowView"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Margin="1,0,1,0" Padding="1,0,1,0" Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGridRow}}, Path=Item}"/> </DataTemplate> How can i get the row index and use my converter function to set the row header text?

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• How to make TwoWay binding on properties of ObservableCollection of custom class using mvvm pattern?

  - by mill

  I have the following class: public class UserGroup { public string GroupName { get; set; } public bool IsIntheGroup{ get; set; } } I want to bind an ObservableCollection of UserGroup items to listbox containing checkbox’s for each item in the collection and the checkbox is cheked based on the IsIntheGroup property of the UserGroup. In my ViewModel I made an ObservableCollection of the UserGroup class: public ObservableCollection Groups { get; set; } and loaded its contents (instances of UserGroup) from my database model I used the following code in my view: ListBox ItemsSource="{Binding Groups, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" ListBox.ItemTemplate DataTemplate StackPanel Orientation="Horizontal" CheckBox IsChecked="{Binding IsIntheGroup, Mode=TwoWay}"/ TextBlock Text="{Binding GroupName}" / /StackPanel /DataTemplate /ListBox.ItemTemplate /ListBox The problem is I am not notified when the user checks/unchecks a check box in the list so my two way binding failed… How do I do a two way binding in such a case?

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• textbox, combobox in WPF listview.

  - by RAJ K

  hello everyone, I am porting an application from foxpro to C#.Net. This is a wine shop billing software. Its billing interface screenshot link is here http://picasaweb.google.com/raj.kishor09/RAJK?feat=directlink But my client wants similar interface on WPF too. I think listview can help me in this regard but don't know how to implement. i figured out that each row of listview should have 2 textbox, 1 combobox and few textblock or label. Not only this but cursor should jump from one control to other control using "Enter/Return" key instead of "Tab" key. Please help me with some code lines. Please guys help me......

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• Bind a WPF combobox and get selecteditem to a richtextbox

  - by Peter

  Hi, I am using a dataset on the server, in this dataset I have a datatable that calls a stored procedure and returns column names from three tables. I call this stored procedure using a web service. I manage to show all the column names in my combobox but when I want to click a button and insert selected column name into a richtextbox I get System.Data.DataRowView in the textbox instead. My code: 'the combobox 'if I don't have this textblock all the values are shown vertical instead of the normal horizontal lines 'the stored procedure SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE (TABLE_NAME = 'Customer') OR (TABLE_NAME = 'Invoices') OR (TABLE_NAME = 'Orders') 'the button Private Sub btnAddColumnNames_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btnAddColumnNames.Click ' Add column names to the richtextbox Dim tr As New TextRange(rtbText.Selection.Start, rtbText.Selection.End) tr.Text = cboColumnNames.SelectedItem.ToString() rtbText.Focus() End Sub Any suggestions on how to get the selected text in the combobox to the richtextbox? Any help is appreciated.

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• progress bar in separate window

  - by Kelly

  (WPF) We have been asked to build a little window that pops up when the app is busy (instead of or in addition to a wait cursor). We put a textblock in the window, and a ProgressBar with IsIndeterminate = true. We call show on the little window, and then start up our long-running process, calling Close on the little window when we are through. However, during the long-running process, the ProgressBar does not show any activity, and the little window shows (Not Responding) in its title. Is this even possible? A better idea?

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• Binding to an ObservableCollection of UserControls

  - by nlawalker

  Simple Silverlight question: I have an ObservableCollection<MyObject> in my viewmodel. Every MyObject has a Label property. If I bind a ListBox to the collection and set DisplayMemberPath to Label, or set the ItemTemplate to a TextBlock that binds the Text property to Label, all works as expected. If I change MyObject so it derives from a UserControl, the Label text no longer shows up in the ListBox; each item just shows up as a blank strip a few pixels tall. Why is this? There's obviously something I'm missing here about how different things get rendered.

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• Adding and altering multiple text items to a Canvas -- what approach?

  - by philologon

  I am attempting to use a Canvas to create a simple Cad application. I have been able to get lines to draw as I want. For now the only other thing I need is text. The user should be able to edit the text in place. ?Is one of these better to use for this over the others? Rich Text TextBlock TextBox Label A more important question, though, is once I have chosen which class to use for implementation, how do I set and get the text value in code? Since the app is in essence a cad application, text will be added, deleted, and altered often, so I am not attempting to put these in XAML, but code-behind. That is why I am asking about how to do this in code. If the answer is "use X.SetValue()" (or that family of methods), then please tell me what I am supposed to do with the required DependencyProperty reference? TIA. Paul

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• Dynamically update Font Size of application with a single trigger in WPF

  - by Sukan

  I have an application which has different font sizes for different controls say Button: 10, TextBlock : 12 etc. I want to give options to the user where he can select any one of the below say Normal , Small, Big, Bigger. Suppose one selects "small" I would want to decrease every distinct font size by 2. If "Big", I would want to increase every font size by 2. I hope we can do this using converter sending actual font size as parameter and render as per the selected choice if I am not wrong. What will be the best option. Sorry if my doubt is absurd or silly. Thank you.

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• WPF DataGrid: How to set content alignment of RowHeader to 'Center'

  - by Nike

  I use WPF DataGrid. I put a text value in RowHeader and want to set alignment of RowHeader content to 'Center'. I tried this: <toolkit:DataGrid.RowHeaderStyle> <Style TargetType="{x:Type toolkit:Primitives.DataGridRowHeader}"> <Setter Property="HorizontalAlignment" Value="Center"/> <Setter Property="HorizontalContentAlignment" Value="Center"/> </Style> </toolkit:DataGrid.RowHeaderStyle> but it doesn't work. Actually I think that there is TextBlock in RowHeader and I need to set its TextAlignment Property to Center. How can do it?

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• Update JSON file C# W8 development

  - by AndrewB

  At the moment, I've got a JSON file with content looking like this: { "username": "test", "someNumber":100 } I'm using JSON.Net to fetch the .JSON file from a webserver - C#: var http = new HttpClient(); http.MaxResponseContentBufferSize = Int32.MaxValue; var response = await http.GetStringAsync(URI); var result = JsonConvert.DeserializeObject<DatClass.Result>(response); This works great together with the class getting/setting the properties. However, what I would like to know is whether there's a good way for a user to update the .JSON file through a textbox UI? As in: [textbox - update username] [update button] - username sent to server - .JSON file updated - [textblock - showing updated username in UI]. I'm not looking for exact code solutions, I'm rather looking for good solutions on this, and/or if this is a terrible idea of an easy database(?).

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• How to get the width of the whole text of the widget in WPF?

  - by macias

  Remarks Before I ask, let me focus on words: the length of "i" is 1 the length of "w" is 1 the render width of "w" is greater than "i" (except for monospace font) -- I am interested in this and from now on, I would simply write "width" The problem (small picture) Let's say I have incredible long text set for TextBlock widget which width is 100. And the text does not fit (the text is clipped -- i.e. only small portion of text is visible). The question is -- what is the width of the entire text (visible + not visible parts)? The background (big picture) I have a window width DataGrid (WPF standard) as main widget which contains text. I try to resize window and DataGrid in such way, that all texts will be visible without need of resizing and/or scrolling. I focus on width. The size of the window vs. size of the screen is not an issue, the text is so short that it would fit even on netbook screen.

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• Tag property null when data binding

  - by rotary_engine

  Can anyone see what is wrong with this? The Tag property is returning null however the Binding for Id property is definately returning an int value. <ListBox ItemsSource="{Binding ElementName=myDomainDataSource, Path=Data}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Path=Id, Mode=OneWay}" /> <HyperlinkButton Content="Edit" Tag="{Binding ElementName=Id, Mode=OneWay}" Click="Edit_Click" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> and then... private void Edit_Click(object sender, RoutedEventArgs e) { ContentControl c = sender as ContentControl; // exception - c.Tag is null int id = (int)c.Tag; } The Id property is showing a value on the UI, but doesn't seem to be getting stored in the buttons Tag property.

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• Setting a property in XAML for a User Control

  - by Ben

  Hi, I have a user control that has a property of type Integer, that i am trying to set in the XAML Template to be that of a property within the bindingsource. If I set the property using a hard coded integer i.e. <MyControl MyIntegerProperty="3" /> This works fine, but if i try <MyControl MyIntegerProperty="{Binding MyDataContextIntegerProperty}" /> it fails. I know that the integer property on MyDataContext is returning a valid integer, and i know that this format works, as directly above this in the template, i have the line <TextBlock Text="{Binding MyDataContextStringProperty}" /> which works correctly. Is there any flag that i need to set on my User Controls Integer property to allow this to work? Or am i doing something else wrong? Thanks

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• Binding Data Template element to property on sub-class

  - by TerrorAustralis

  Hi guys, I have a class, for experiment sake call it foo() and another class, call it bar() I have a data template for class foo() defined in my xaml, but one of foo()'s properties is a bar() object such that foo() { Public string Name {get; set;} Public int ID {get; set;} Public bar barProp {get; set;} } and bar() { Public string Description{get; set;} } I want my data template of foo to display the Description property of bar. I have tried the simple <textblock Text="{Binding Path=barProp.Description}" /> and variants to no avail Seeking wisdom, DJ

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• wpf: How to keep an image stay in its original size?

  - by Martin Luo

  hi, guys! i have a problem about the image display in wpf. here's my code <Button HorizontalAlignment="Left" Grid.Column="1" Grid.Row="5" Margin="0,5"> <Button.Content> <StackPanel Orientation="Horizontal" Margin="10,0"> <Image Source="/images/user_add.png" Stretch="None" HorizontalAlignment="Center" VerticalAlignment="Center" Width="24" Height="24" /> <TextBlock Text="??" /> </StackPanel> </Button.Content> </Button> i hava the image with original size 32*32, but when i ran the above code, the image will stretch to fill all the space, beyond its original size, and i also set the "Stretch" property to "None", but it seems that it doesn't work. so, how can i fix this problem? thank u~~~!

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• How can I refer to a binding converter in another namespace in Silverlight XAML?

  - by Mike Pateras

  Since you apparently can't create a Silverlight DataTemplate in C#, I'm trying to create one in XAML. I have a converter that I need to refer to, that I have defined in C# in another namespace. I've tried doing this: <UserControl.Resources> <DataTemplate x:Key="PriceTemplate"> <TextBlock Text="{Binding Price, Converter={Converters:PriceConverter}}" /> </DataTemplate> </UserControl.Resources> Where Converters is an xmlns that points to the correct namespace. However, I get a compilation error that says: Type 'Converters:PriceConverter' is used like a markup extension but does not derive from MarkupExtension. I tried adding System.Windows.Markup.MarkupExtension as a parent to my converter, but it apparently doesn't exist in Silverlight. How can I refer to my converter in XAML, without having to rewrite it in XAML?

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