我想用编程方式创建一个基本的用户控件.
在这种风格我想添加一个网格(没有问题),但我不能添加列定义到这个网格.
在这种风格我想添加一个网格(没有问题),但我不能添加列定义到这个网格.
我的示例代码是
ControlTemplate templ = new ControlTemplate();
FrameworkElementFactory mainPanel = new FrameworkElementFactory(typeof(DockPanel));
mainPanel.SetValue(DockPanel.LastChildFillProperty,true);
FrameworkElementFactory headerPanel = new FrameworkElementFactory(typeof(StackPanel));
headerPanel.SetValue(StackPanel.OrientationProperty,Orientation.Horizontal);
headerPanel.SetValue(DockPanel.DockProperty,Dock.Top);
mainPanel.AppendChild(headerPanel);
FrameworkElementFactory headerImg = new FrameworkElementFactory(typeof(Image));
headerImg.SetValue(Image.MarginProperty,new Thickness(5));
headerImg.SetValue(Image.HeightProperty,32d);
headerImg.SetBinding(Image.SourceProperty,new Binding("ElementImage") { RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent) });
headerPanel.AppendChild(headerImg);
FrameworkElementFactory headerTitle = new FrameworkElementFactory(typeof(TextBlock));
headerTitle.SetValue(TextBlock.FontSizeProperty,16d);
headerTitle.SetValue(TextBlock.VerticalAlignmentProperty,VerticalAlignment.Center);
headerTitle.SetBinding(TextBlock.TextProperty,new Binding("Title") { RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent) });
headerPanel.AppendChild(headerTitle);
FrameworkElementFactory mainGrid = new FrameworkElementFactory(typeof(Grid));
FrameworkElementFactory c1 = new FrameworkElementFactory(typeof(ColumnDefinition));
c1.SetValue(ColumnDefinition.WidthProperty,new GridLength(1,GridUnitType.Star));
FrameworkElementFactory c2 = new FrameworkElementFactory(typeof(ColumnDefinition));
c2.SetValue(ColumnDefinition.WidthProperty,GridUnitType.Auto));
FrameworkElementFactory c3 = new FrameworkElementFactory(typeof(ColumnDefinition));
c3.SetValue(ColumnDefinition.WidthProperty,new GridLength(3,GridUnitType.Star));
FrameworkElementFactory colDefinitions = new FrameworkElementFactory(typeof(ColumnDefinitionCollection));
colDefinitions.AppendChild(c1);
colDefinitions.AppendChild(c2);
colDefinitions.AppendChild(c3);
mainGrid.AppendChild(colDefinitions);
mainPanel.AppendChild(mainGrid);
FrameworkElementFactory content = new FrameworkElementFactory(typeof(ContentPresenter));
content.SetBinding(ContentPresenter.ContentProperty,new Binding() { RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),Path = new PropertyPath("Content") });
mainGrid.AppendChild(content);
templ.VisualTree = mainPanel;
Style mainStyle = new Style();
mainStyle.Setters.Add(new Setter(UserControl.TemplateProperty,templ));
this.Style = mainStyle;
但是类型为ColumnDefinitionCollection的FrameworkElementFactory的创建将抛出异常“”ColumnDefinitionCollection“类型必须从FrameworkElement,FrameworkContentElement或Visual3D派生.
谁能帮我？
解决方法
FrameworkElementFactory有一些自定义逻辑来处理Grid中的ColumnDefinitions和RowDefinitions.对于这些价值观,您可以像工厂树中的孩子一样对待他们,例如：
FrameworkElementFactory gridFactory = new FrameworkElementFactory(typeof(Grid));
var column1 = new FrameworkElementFactory(typeof(ColumnDefinition));
column1.SetValue(ColumnDefinition.WidthProperty,GridUnitType.Auto));
var column2 = new FrameworkElementFactory(typeof(ColumnDefinition));
column2.SetValue(ColumnDefinition.WidthProperty,GridUnitType.Star));
gridFactory.AppendChild(column1);
gridFactory.AppendChild(column2);