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本文將講解的是WF4屬性窗格PropertyGrid擴(kuò)展，希望對大家了解Windows Workflow Foundation框架有所幫助。
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#T#
1. 我們有一個(gè)CaryActivity活動如下：
- namespace CaryPropertyGridExten
- {
- public sealed class CaryActivity : CodeActivity
- {
- public InArgument Text { get; set; }
- public double RepeatCount { get; set; }
- public string FileName { get; set; }
- protected override void Execute(CodeActivityContext context)
- {
- }
- }
- }
2. 上面活動有RepeatCount和FileName屬性，我們會為這兩個(gè)屬性在屬性窗格的設(shè)置自定義屬性值編輯器，要達(dá)到效果如下圖：
3. 分別定義兩個(gè)屬性對應(yīng)的屬性值編輯器如下：
- namespace CaryPropertyGridExten
- {
- class CustomInlineEditor : PropertyValueEditor
- {
- public CustomInlineEditor()
- {
- this.InlineEditorTemplate = new DataTemplate();
- FrameworkElementFactory stack = new FrameworkElementFactory(typeof(StackPanel));
- FrameworkElementFactory slider = new FrameworkElementFactory(typeof(Slider));
- Binding sliderBinding = new Binding("Value");
- sliderBinding.Mode = BindingMode.TwoWay;
- slider.SetValue(Slider.MinimumProperty, 0.0);
- slider.SetValue(Slider.MaximumProperty, 100.0);
- slider.SetValue(Slider.ValueProperty, sliderBinding);
- stack.AppendChild(slider);
- FrameworkElementFactory textb = new FrameworkElementFactory(typeof(TextBox));
- Binding textBinding = new Binding("Value");
- textb.SetValue(TextBox.TextProperty, textBinding);
- textb.SetValue(TextBox.IsEnabledProperty, false);
- stack.AppendChild(textb);
- this.InlineEditorTemplate.VisualTree = stack;
- }
- }
- }
- namespace CaryPropertyGridExten
- {
- class FilePickerEditor : DialogPropertyValueEditor
- {
- public FilePickerEditor()
- {
- this.InlineEditorTemplate = new DataTemplate();
- FrameworkElementFactory stack = new FrameworkElementFactory(typeof(StackPanel));
- stack.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);
- FrameworkElementFactory label = new FrameworkElementFactory(typeof(Label));
- Binding labelBinding = new Binding("Value");
- label.SetValue(Label.ContentProperty, labelBinding);
- label.SetValue(Label.MaxWidthProperty, 90.0);
- stack.AppendChild(label);
- FrameworkElementFactory editModeSwitch = new FrameworkElementFactory(typeof(EditModeSwitchButton));
- editModeSwitch.SetValue(EditModeSwitchButton.TargetEditModeProperty, PropertyContainerEditMode.Dialog);
- stack.AppendChild(editModeSwitch);
- this.InlineEditorTemplate.VisualTree = stack;
- }
- public override void ShowDialog(PropertyValue propertyValue, IInputElement commandSource)
- {
- Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();
- if (ofd.ShowDialog() == true)
- {
- propertyValue.Value = ofd.FileName.Substring(ofd.FileName.LastIndexOf('\\') + 1);
- }
- }
- }
- }
4. 在CaryActivity的構(gòu)造函數(shù)中增加自定義屬性的信息如下，關(guān)于AttributeTableBuilder及MetadataStore的使用可參考關(guān)于元數(shù)據(jù)存儲區(qū)MetadateStore及AttributeTableBuilder這篇文章。
- public CaryActivity()
- {
- AttributeTableBuilder builder = new AttributeTableBuilder();
- builder.AddCustomAttributes(typeof(CaryActivity), "RepeatCount", new EditorAttribute(typeof(CustomInlineEditor), typeof(PropertyValueEditor)));
- builder.AddCustomAttributes(typeof(CaryActivity), "FileName", new EditorAttribute(typeof(FilePickerEditor), typeof(DialogPropertyValueEditor)));
- MetadataStore.AddAttributeTable(builder.CreateTable());
- }
當(dāng)前文章：淺析WF4屬性窗格PropertyGrid擴(kuò)展
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