Questions tagged [silverlight]

Silverlight is Microsoft's cross-browser, cross platform plug-in for media experiences and rich interactive applications.

silverlight
Filter by
Sorted by
Tagged with
414 votes
5 answers
289k views

Difference between SelectedItem, SelectedValue and SelectedValuePath

What is the difference betweeen the following: SelectedItem SelectedValue SelectedValuePath All these dependency properties are defined in Selector class. I often confuse SelectedItem with ...
Sarfaraz Nawaz's user avatar
266 votes
35 answers
180k views

How to automatically select all text on focus in WPF TextBox?

If I call SelectAll from a GotFocus event handler, it doesn't work with the mouse - the selection disappears as soon as mouse is released. EDIT: People are liking Donnelle's answer, I'll try to ...
Sergey Aldoukhov's user avatar
215 votes
11 answers
210k views

How do I space out the child elements of a StackPanel?

Given a StackPanel: <StackPanel> <TextBox Height="30">Apple</TextBox> <TextBox Height="80">Banana</TextBox> <TextBox Height="120">Cherry</TextBox> </...
GraemeF's user avatar
  • 11.4k
183 votes
8 answers
127k views

This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread [duplicate]

I have a DataGrid which is populating data from ViewModel by asynchronous method.My DataGrid is : <DataGrid ItemsSource="{Binding MatchObsCollection}" x:Name="dataGridParent" ...
Anindya's user avatar
  • 2,636
167 votes
8 answers
9k views

Getting Started with Windows Phone 7 [closed]

This is a community wiki list of Windows Phone 7 resources. Feel free to edit/add/etc. When posting, please use the friendly format of [Actual Name of resource with a link] not [some long URL with ...
140 votes
11 answers
149k views

Could not find an implementation of the query pattern

In my silverlight application I am trying to create a database connection using LINQ. First I add a new LINQ to SQL class, and drag my table called "tblPersoon" into it. Then in my service file I try ...
Schoof's user avatar
  • 2,772
126 votes
4 answers
58k views

WPF vs Silverlight [duplicate]

Possible Duplicate: What is the difference between WPF and Silverlight application? What are the exact differences between WPF and Silverlight?
Sauron's user avatar
  • 16.8k
123 votes
6 answers
271k views

How to trigger event when a variable's value is changed?

I'm currently creating an application in C# using Visual Studio. I want to create some code so that when a variable has a value of 1 then a certain piece of code is carried out. I know that I can use ...
James Mundy's user avatar
  • 4,309
93 votes
10 answers
15k views

TextBox.TextChanged event firing twice on Windows Phone 7 emulator

I have a very simple test app just to play around with Windows Phone 7. I've just added a TextBox and a TextBlock to the standard UI template. The only custom code is the following: public partial ...
Jon Skeet's user avatar
  • 1.5m
90 votes
11 answers
47k views

Cannot install silverlight 4 tools on visual studio 2010 sp1

I've installed Visual Studio 2010 (fresh install), then applied the SP1. Now I've tried to install the silverlight 4 tools, but i'm getting a strange error message : "Visual Studio 2010 or Visual ...
Daniel Perez's user avatar
  • 4,312
90 votes
4 answers
77k views

How to create a style based on default style?

How to create a style based on default style in Silverlight? For example, in WPF we make it like: <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}"> <Setter ...
ZuTa's user avatar
  • 1,424
78 votes
6 answers
123k views

Format Date/Time in XAML in Silverlight

I have a Silverlight 4 application. I have a C# DateTime object that I'm binding to my UI. I want this DateTime to be in the format of dd/mm/yyyy time (TimeZone). For instance, today would be ...
user687554's user avatar
  • 10.9k
78 votes
1 answer
73k views

Bind Collection to StackPanel

I want to take a collection of objects and bind it to a StackPanel so basically if the collection has 4 elements, inside the stack panel that should produce 4 buttons lets say. I tried this...But I ...
Gabe's user avatar
  • 50.1k
73 votes
29 answers
6k views

What is so evil about a Flash based website?

I have the feeling that Flash-based ( or Silverlight-based) websites are generally frowned upon, except when you are creating games or multimedia-content rich applications. Why this is so?
Graviton's user avatar
  • 82.6k
70 votes
22 answers
15k views

Silverlight vs Flex [closed]

My company develops several types of applications. A lot of our business comes from doing multimedia-type apps, typically done in Flash. However, now that side of the house is starting to migrate ...
Kevin Griffin's user avatar
68 votes
4 answers
123k views

Encoding parameters for a URL

I have a Silverlight application that is building a URL. This URL is a call to a REST-based service. This service expects a single parameter that represents a location. The location is in the form of "...
user70192's user avatar
  • 14k
64 votes
4 answers
36k views

Validation Error Style in WPF, similar to Silverlight

By default, the Validation.ErrorTemplate in WPF is just a small red border without any ToolTip. In Silverlight 4, the validation error is nicely styled out-of-the-box. Here is a comparison of a ...
Fredrik Hedblad's user avatar
64 votes
1 answer
9k views

What is the difference for TargetType="{x:Type Button}" and TargetType="Button"?

What is the difference for TargetType="{x:Type Button}" and TargetType="Button"
DEN's user avatar
  • 1,893
61 votes
5 answers
39k views

What is an easing function?

What is meant by easing function in the context of animation. It seems that dojo, jquery, silverlight, flex and other UI systems have the notion of easing function. I could not locate a good ...
ams's user avatar
  • 61.5k
59 votes
8 answers
125k views

Set CornerRadius on button template

I want to have a Button that defines no CornerRadius and two others that do, how can I achieve this? <Style TargetType="Button" x:Key="TabButton"> <Setter Property="Background" Value="...
Chris's user avatar
  • 27k
57 votes
5 answers
31k views

How to Avoid Firing ObservableCollection.CollectionChanged Multiple Times When Replacing All Elements Or Adding a Collection of Elements

I have ObservableCollection<T> collection, and I want to replace all elements with a new collection of elements, I could do: collection.Clear(); OR: collection.ClearItems(); (BTW, what's ...
Peter Lee's user avatar
  • 13.4k
55 votes
11 answers
45k views

Can't install Silverlight Developer runtime

I have installed VS 2010 professional with full installation in Windows 7. I have installed Silverlight 5.0 separately. When I create silverlight application, it asks for installing silverlight ...
Siva Sankaran's user avatar
54 votes
8 answers
51k views

How can I align a CheckBox with its content?

The look of a WPF CheckBox misaligns the check portion with the label (content) portion. The check stays slightly above the content as shown here: The XAML looks like this: <CheckBox Content="...
DeveloperDan's user avatar
  • 4,664
53 votes
8 answers
65k views

Converter With Multiple Parameters

How does one use a converter with Multiple parameters in a Windows Phone 7 Application?
Harshad Bhola's user avatar
53 votes
2 answers
95k views

How to go to particular Item in IEnumerable

I have IEnumerable which contains number Data inside it. Edit The IEnumerable is from System.Collection.Ienumerable directive. Attached the snapShot of Viual Studio, Enum that Contains Data: alt ...
Simsons's user avatar
  • 12.5k
53 votes
1 answer
12k views

Make a XAML file internal in .NET

In my Silverlight project, I would like to make an assembly which contains .xaml that can't be seen from outside of the assembly. However, there is no clear way I can do this. When I modify the access ...
user64349's user avatar
  • 583
53 votes
5 answers
64k views

Access codebehind variable in XAML

How can I access the public variable which in Sample.xaml.cs file like asp.net <%=VariableName%>?
Murat's user avatar
  • 888
51 votes
6 answers
62k views

How to make checkbox bigger

I'm using a checkbox control like this: <CheckBox VerticalAlignment="Bottom" IsChecked="{Binding Selected}" Grid.Column="0" FontSize="{StaticResource PhoneFontSizeLarge}" ...
Sly's user avatar
  • 15.1k
51 votes
4 answers
98k views

How do I update a single item in an ObservableCollection class?

How do I update a single item in an ObservableCollection class? I know how to do an Add. And I know how to search the ObservableCollection one item at a time in a "for" loop (using Count as a ...
xarzu's user avatar
  • 9,105
51 votes
3 answers
76k views

How do I raise an event in a usercontrol and catch it in mainpage?

I have a UserControl, and I need to notify the parent page that a button in the UserControl was clicked. How do I raise an event in the UserControl and catch it on the Main page? I tried using static, ...
user avatar
51 votes
9 answers
34k views

Hiding inherited members

I'm looking for some way to effectively hide inherited members. I have a library of classes which inherit from common base classes. Some of the more recent descendant classes inherit dependency ...
MojoFilter's user avatar
  • 12.3k
50 votes
6 answers
55k views

Silverlight 4: Resolving Microsoft.Silverlight.CSharp.targets was not found?

I've been upgrading some Silverlight 3 apps to Silverlight 4 in Visual Studio 2010. My Silverlight 3 apps open fine in Visual Studio, but SL4 apps don't, with the following error: C:\Path\To\...
Brandon's user avatar
  • 14.1k
50 votes
17 answers
16k views

How do you force Firefox to not cache or re-download a Silverlight XAP file?

When working with Silverlight, I've noticed that Firefox will cache the XAP file, so if I do an update, a user may be stuck using an outdated version. Is there a way to force the browser to either re-...
Yttrium's user avatar
  • 2,087
49 votes
8 answers
29k views

TextBox Binding TwoWay Doesn't Update Until Focus Lost WP7

I have a page with some text boxes for data input. The binding of the text box is set to TwoWay. The data in my view model only gets updated if the text box loses focus. If I click a button, such as ...
Josh Close's user avatar
  • 23.1k
49 votes
2 answers
9k views

WPF/Silverlight - Prism - Resources for beginners

Official Websites Composite Application Guidance for WPF and Silverlight patterns & practices: Composite WPF and Silverlight Articles Composite Web Apps With Prism Podcasts PRISM for ...
48 votes
8 answers
55k views

Good Silverlight-MVVM Practice Example

I've read a number of good articles about the Model-View-ViewModel pattern and my team intends to implement this pattern in the latest version of our app. I still don't quite get ALL the bits that go ...
Steve Brouillard's user avatar
47 votes
26 answers
81k views

Error HRESULT E_FAIL has been returned from a call to a COM component

In Silverlight 4 app; what does this error mean?: "Error HRESULT E_FAIL has been returned from a call to a COM component." It's a very generic error. The VS debugger doesn't point to the exact ...
pencilslate's user avatar
46 votes
10 answers
5k views

Setting a custom property within a WPF/Silverlight page

This sounds like it should be simple. I have a Page declared in XAML in the normal way (i.e. with "Add new item...") and it has a custom property. I'd like to set that property in the XAML ...
Jon Skeet's user avatar
  • 1.5m
45 votes
5 answers
29k views

Benefits of MVVM over MVC

Finally getting to do some Silverlight development and I came across MVVM. I am familiar with MVC and the article I was reading said because of XAML, MVC would not work out. Not having too much ...
JD.'s user avatar
  • 15.4k
44 votes
6 answers
163k views

How to programmatically set the Image source

When the Image's Source property is set the following way, the picture is taken from /Images/down.png. How would I do the same thing programmatically? <Image x:Name="myImg" Source="/MyProject;...
Kornelije Petak's user avatar
43 votes
7 answers
28k views

Hide tooltip if binding is null

Currently i've got the following code to show a tooltip. <Border BorderBrush="Black" BorderThickness="{Binding Border}" Height="23" Background="{Binding Color}"> <...
Theun Arbeider's user avatar
43 votes
3 answers
14k views

MVVM Light: how to unregister Messenger

I love the MVVM Light's Messenger and its flexibility, however I'm experiencing memory leaks when I forget to explicitly unregister the recipients (in Silverlight 4). The cause is explained here, but ...
Francesco De Vittori's user avatar
42 votes
2 answers
16k views

Why dependency properties?

Why did Microsoft go the route of making dependency properties and dependency objects instead of using reflection and maybe attributes?
Mr Bell's user avatar
  • 9,288
42 votes
12 answers
22k views

Should I use the Model-View-ViewModel (MVVM) pattern in Silverlight projects?

One challenge with Silverlight controls is that when properties are bound to code, they're no longer really editable in Blend. For example, if you've got a ListView that's populated from a data feed, ...
Jon Galloway's user avatar
  • 52.6k
42 votes
0 answers
2k views

How to make a composite manifest for Microsoft smooth streaming

I am new to Microsoft Smooth Streaming and have questions about the making of composite manifests. Following the guidance from here. I was able to make a composite manifest of a single clip element ...
Lich's user avatar
  • 671
41 votes
11 answers
24k views

Xap packaging failed. Object reference not set to an instance of an object

I'm getting this error message on my PC when I try to build my Windows Phone app: Xap packaging failed. Object reference not set to an instance of an object I'm using Dropbox. On my laptop, It works ...
Subby's user avatar
  • 5,460
41 votes
5 answers
43k views

Unknown build error Cannot resolve dependency to System.Windows

I just downloaded PoshConsole's source code and was trying to build the solution. I initially had two problem - the System.Interactivity.dll could not be resolved. I installed Blend 4 SDK and that ...
gprasant's user avatar
  • 15.9k
40 votes
5 answers
28k views

Determining the Enter key is pressed in a TextBox

Consider a XAML TextBox in Win Phone 7. <TextBox x:Name="UserNumber" /> The goal here is that when the user presses the Enter button on the on-screen keyboard, that would kick off some ...
p.campbell's user avatar
  • 99.5k
40 votes
1 answer
7k views

What are these numbers on the right side of my Windows Phone Silverlight app?

I've got a Windows Phone Silverlight app, and there are some numbers to the right when I run the emulator: What do they mean, and how can I hide them?
Mike Pateras's user avatar
  • 14.9k
39 votes
4 answers
44k views

Silverlight: stretching to remaining space in StackPanel

I have a vertical StackPanel with two elements: a Button and a ListBox. How can I have the ListBox stretch to the remaining page height? <StackPanel Height="Auto" Width="Auto"> <Button ...
Randy Voet's user avatar
  • 3,740

1
2 3 4 5
544