silverlight

问题 I have created a Canvas, and within it I placed a StackPanel. The StackPanel is horizontal, and it accepts a list of thumbnailed images. The Canvas has a fixed size. When I put more thumbnails than the Canvas width can hold, the StackPanel is supposed to overflow from the Canvas, so I can move it to center the current thumbnail. Everything works correctly, only, the StackPanel's overflow is visible! Is there a way to hide it? Or is the entire approach wrong? Here is a screenshot. The canvas

问题 I have an image with and have a few values to make it a perspective in Silverlight, but can't quite figure out what I need to do mathmatically to make it happen. The most important thing is I have an angle called a "Field of View" ( FOV ). This is the normal picture: For example: X = 30° X = 30° X = 30° FOV = 30° FOV = 60° FOV = 120° X = 60° X = 60° X = 60° FOV = 30° FOV = 60° FOV = 120° Any help would be appreciated to walk me through the math to reproduce these in Silverlight. 回答1: I think

问题 I've been reading up on MVVM and so far have found it very interesting. Most of the examples I've found, however, are for Windows apps, as opposed to Web apps. I've also seen a lot of mention of MVVM used with Silverlight, and I know Silverlight can be used for either Web or Windows apps. So my question is - is MVVM a valid pattern for Web-based apps? If it is, does the UI have to be Silverlight? I'm in the process of deciding which technologies to use for a new mid-size website we need to

问题 Background: Entity Framework 4 Silverlight 4 RIA services MSSQL Server 2008 I have an entity that has a String property named Description. In database it maps to the NOT NULL NVARCHAR(200) . Problem: When I try to insert a new row of that entity, this is what I do: MyExampleEntity entity = new MyExampleEntity() { Name = "example", Description = "" // NOTE THIS LINE! }; DatabaseContext db = new DatabaseContext(); db.MyExampleEntities.Add(entity); db.SubmitChanges(); This, however, causes an

问题 I am converting an existing multi-target Silverlight/.NET project to a Portable Class Library project in order to reduce the number of projects that are required to support multiple Microsoft platforms. I have an error in one class that is using the System.Security.Cryptography namespace The type or namespace name 'Cryptography' does not exist in the namespace 'System.Security' (are you missing an assembly reference?) This namespace is available in Silverlight and I am wondering why the

问题 Using Silverlight 4 & WPF 4, I'm trying to create a button style that alters the text color of any contained text when the button is mouseover'd. Since I'm trying to make this compatible with both Silverlight & WPF, I'm using the visual state manager: <Style TargetType="{x:Type Button}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Border x:Name="outerBorder" CornerRadius="4" BorderThickness="1" BorderBrush="#FF757679"> <VisualStateManager

问题 How can I create a DataTemplate in code (using C#) and then add a control to that DataTemplate ? <data:DataGrid.RowDetailsTemplate> <DataTemplate> <Border> <Border Margin="10" Padding="10" BorderBrush="SteelBlue" BorderThickness="3" CornerRadius="5"> <TextBlock Text="{Binding Description}" TextWrapping="Wrap" FontSize="10"> </TextBlock> </Border> </Border> </DataTemplate> </data:DataGrid.RowDetailsTemplate> I am using Sivlerlight. 回答1: As far as I know, the only way to create a DataTemplate

问题 I'm experiencing some difficulties with a WCF RIA Services similar to the problem specified in this thread. The domainservice method I'm creating (a Query method) should take a complex object parameter. example domainservice method: public ComplexObjectResult GetComplexObject(ComplexObjectParameter test) { //do stuff } the parameter object: public class ComplexObjectParameter { [Key] public decimal ID { get; set; } ... other fields } I get this compilation error: Error 70 Parameter 'test' of

问题 The UIElement.Clip property takes a Geometry object and uses it to clip away the outside of the UIElement . I would like to do the geometric inverse and punch a hole into the element instead. Anyone know how to do this? I imagine creating an inverted version of the clip geometry would work, but I can't find a way to do this. EDIT It seems that WPF has Geometry.Combine which can be used to subtract one geometry from another, though this isn't available in Silverlight. If it were, I could

问题 The UIElement.Clip property takes a Geometry object and uses it to clip away the outside of the UIElement . I would like to do the geometric inverse and punch a hole into the element instead. Anyone know how to do this? I imagine creating an inverted version of the clip geometry would work, but I can't find a way to do this. EDIT It seems that WPF has Geometry.Combine which can be used to subtract one geometry from another, though this isn't available in Silverlight. If it were, I could