Silverlight的几个知识点

首先添加一个Grid

<Grid x:Name="GTest" ShowGridLines="False" SizeChanged="GTest_SizeChanged" > </Grid>

1. Grid动态添加新的列和行。

this.GTest.RowDefinitions.Add(new RowDefinition() {Height=new GridLength(30) }); this.GTest.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });

2. 为Grid动态添加Border的样式。

Border tempBorder = new Border(); tempBorder.BorderThickness = new Thickness(1); tempBorder.BorderBrush = new SolidColorBrush(Colors.Red); tempBorder.SetValue(Grid.ColumnProperty, 1); tempBorder.SetValue(Grid.ColumnSpanProperty, 2); this.GTest.Children.Add(tempBorder);

3. 动态添加Button及Button的背景图片。

// Add new button Button btnNew = new Button(); ImageBrush imageBrush = new ImageBrush(); imageBrush.ImageSource = new BitmapImage(new Uri(@"../Images/New.gif", UriKind.Relative)); btnNew.Background = imageBrush; btnNew.Width = 20; btnNew.Height = 20; btnNew.SetValue(Grid.ColumnProperty, 0); btnNew.SetValue(Grid.RowProperty, iContentStart); btnNew.Click += new RoutedEventHandler(btnNew_Click); titlePanel.Children.Add(btnNew);

4. 鼠标移动事件。

Rectangle rec = new Rectangle(); rec.Stroke = new SolidColorBrush(Colors.Black); rec.Fill = new SolidColorBrush(Colors.Orange); rec.MouseLeftButtonDown +=new MouseButtonEventHandler(rec_MouseLeftButtonDown); rec.MouseLeftButtonUp += new MouseButtonEventHandler(rec_MouseLeftButtonUp); rec.MouseMove += new MouseEventHandler(rec_MouseMove); // Mouse Down Method private void rec_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; mousePosition = e.GetPosition(null); trackingMouseMove = true; if (null != element) { element.CaptureMouse(); element.Cursor = Cursors.Hand; } } // Mouse Move Method private void rec_MouseMove(object sender, MouseEventArgs e) { FrameworkElement element = sender as FrameworkElement; if (trackingMouseMove) { double deltaV = e.GetPosition(null).Y - mousePosition.Y; double deltaH = e.GetPosition(null).X - mousePosition.X; double newTop = deltaV + (double)element.GetValue(Canvas.TopProperty); double newLeft = deltaH + (double)element.GetValue(Canvas.LeftProperty); element.SetValue(Canvas.TopProperty, newTop); element.SetValue(Canvas.LeftProperty, newLeft); mousePosition = e.GetPosition(null); } } // Mouse Move Method private void rec_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; Canvas.SetTop(element, 15); trackingMouseMove = false; element.ReleaseMouseCapture(); mousePosition.X = mousePosition.Y = 0; element.Cursor = null; if (pop != null) { pop.IsOpen = false; } // Update the datebase }

5, Grid的形状改变的时候，去改变Grid的类似那些Canvas控件的形状。

// First Remove the control in the Grid and ReBuild those controls that have been removed private void GTest_SizeChanged(object sender, SizeChangedEventArgs e) { List<UIElement> controlsToRemove = new List<UIElement>(); int RowsCount = this.GTest.RowDefinitions.Count; for (int i = 2; i < RowsCount; i++) { controlsToRemove = (from pControl in GTest.Children where (i == (int)pControl.GetValue(Grid.RowProperty)) select pControl).ToList<UIElement>(); for (int j = 0; j < controlsToRemove.Count; j++) { GTest.Children.Remove(controlsToRemove[j]); } this.GTest.RowDefinitions.Remove(this.GTest.RowDefinitions[2]); } BuildTR(postCollection); }

6，利用WebService异步操作后台数据。

private void UserControl_Loaded(object sender, RoutedEventArgs e) { BuildTRYear(); BuildTRMonth(); BlogWebServiceSoapClient client = new BlogWebServiceSoapClient(); client.GetPostsCompleted +=new EventHandler<GetPostsCompletedEventArgs>(client_GetPostsCompleted); client.GetPostsAsync(); } private void client_GetPostsCompleted(object sender, GetPostsCompletedEventArgs e) { if (e.Error == null) { postCollection = e.Result; BuildTR(postCollection); } }

7，怎样去创建一个PopUp对话框，并设置他的位置和样式，以下代码是我写的一个popup类，用户就可以New一个，然后传入参数

contentTxt就是popup要显示的内容，xOffsite，yOffsite距离父控件的位置，canvas，父控件，这个popup不具有通用行，但是很好改，就可以去适合自己的popup对话框。

public class ContentPop { private string content = string.Empty; private bool isAdd = true; public bool IsAdd { get { return isAdd; } set { isAdd = value; } } public string Content { get { return content; } set { content = value; if (thisPopUp.Child != null) { thisPopUp.Child = null; AddContent(content); } } } private bool isOpen = false; public bool IsOpen { get { return isOpen; } set { isOpen = value; thisPopUp.IsOpen = isOpen; } } private Popup thisPopUp = null; public Popup ThisPopUp { get { return thisPopUp; } } private double xOffsite; public double XOffsite { get { return xOffsite; } set { xOffsite = value; thisPopUp.HorizontalOffset = xOffsite; } } private double yOffsite; public double YOffsite { get { return yOffsite; } set { yOffsite = value; thisPopUp.VerticalOffset = yOffsite; } } private Canvas parantCanvas; public Canvas ParantCanvas { get { return parantCanvas; } set { parantCanvas = value; parantCanvas.Children.Add(thisPopUp); } } private Border border = null; public ContentPop(string content,double xOffsite,double yOffsite,Canvas canvas) { thisPopUp = new Popup(); AddContent(content); canvas.Children.Add(thisPopUp); thisPopUp.HorizontalOffset = xOffsite; thisPopUp.VerticalOffset = xOffsite; thisPopUp.IsOpen = true; this.content = content; this.xOffsite = xOffsite; this.yOffsite = yOffsite; this.isOpen = true; } private void AddContent(string content) { if (thisPopUp.Child == null) { border = new Border(); border.BorderBrush = new SolidColorBrush(Colors.Black); border.BorderThickness = new Thickness(0); StackPanel panel1 = new StackPanel(); TextBlock textblock1 = new TextBlock(); textblock1.Text = content; textblock1.Opacity = 100; panel1.Children.Add(textblock1); border.Child = panel1; thisPopUp.Child = border; } } }