Setting Default Values for Workflow Dependency Properties
When setting default values for dependency properties in Workflow Foundation there are two steps:
- Pass a PropertyMetadata object containing the default value to the DependencyProperty constructor (Line 8). This defaults the value of the property to the passed value.
- Apply the DefaultValue attribute to the property (Line 14). This provides the default value to the PropertyGrid which allows functionality such as the property appearing bold if the value is different to the default and the right-click Reset option to set the property back to the default.
For example:
1: Private Const DefaultPort As Integer = 25 2: 3: Public Shared PortProperty As DependencyProperty = _ 4: DependencyProperty.Register( _ 5: "Port", _ 6: GetType(Integer), _ 7: GetType(SendEmail), _ 8: New PropertyMetadata(DefaultPort) _ 9: ) 10: 11: <Description("Port")> _ 12: <Category("Input")> _ 13: <Browsable(True)> _ 14: <DefaultValue(DefaultPort)> _ 15: <DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)> _ 16: Public Property Port() As Integer 17: Get 18: Return (CType((MyBase.GetValue(SendEmail.PortProperty)), Integer)) 19: End Get 20: Set(ByVal Value As Integer) 21: MyBase.SetValue(SendEmail.PortProperty, Value) 22: End Set 23: End Property
