VB.Net implementasi berbasis kode dari solusi kontrol Perbatasan kobusb. Saya menggunakannya untuk mengisi ListBox of Button kontrol. Kontrol Tombol dibuat dari ekstensi MEF. Setiap ekstensi menggunakan atribut ExportMetaData MEF untuk Deskripsi ekstensi. Ekstensi adalah objek bagan VisiFire. Pengguna menekan sebuah tombol, yang dipilih dari daftar tombol, untuk menjalankan grafik yang diinginkan.
' Create a ListBox of Buttons, one button for each MEF charting component.
For Each c As Lazy(Of ICharts, IDictionary(Of String, Object)) In ext.ChartDescriptions
Dim brdr As New Border
brdr.BorderBrush = Brushes.Black
brdr.BorderThickness = New Thickness(2, 2, 2, 2)
brdr.CornerRadius = New CornerRadius(8, 8, 8, 8)
Dim btn As New Button
AddHandler btn.Click, AddressOf GenericButtonClick
brdr.Child = btn
brdr.Background = btn.Background
btn.Margin = brdr.BorderThickness
btn.Width = ChartsLBx.ActualWidth - 22
btn.BorderThickness = New Thickness(0, 0, 0, 0)
btn.Height = 22
btn.Content = c.Metadata("Description")
btn.Tag = c
btn.ToolTip = "Push button to see " & c.Metadata("Description").ToString & " chart"
Dim lbi As New ListBoxItem
lbi.Content = brdr
ChartsLBx.Items.Add(lbi)
Next
Public Event Click As RoutedEventHandler
Private Sub GenericButtonClick(sender As Object, e As RoutedEventArgs)
Dim btn As Button = DirectCast(sender, Button)
Dim c As Lazy(Of ICharts, IDictionary(Of String, Object)) = DirectCast(btn.Tag, Lazy(Of ICharts, IDictionary(Of String, Object)))
Dim w As Window = DirectCast(c.Value, Window)
Dim cc As ICharts = DirectCast(c.Value, ICharts)
c.Value.CreateChart()
w.Show()
End Sub
<System.ComponentModel.Composition.Export(GetType(ICharts))> _
<System.ComponentModel.Composition.ExportMetadata("Description", "Data vs. Time")> _
Public Class DataTimeChart
Implements ICharts
Public Sub CreateChart() Implements ICharts.CreateChart
End Sub
End Class
Public Interface ICharts
Sub CreateChart()
End Interface
Public Class Extensibility
Public Sub New()
Dim catalog As New AggregateCatalog()
catalog.Catalogs.Add(New AssemblyCatalog(GetType(Extensibility).Assembly))
'Create the CompositionContainer with the parts in the catalog
ChartContainer = New CompositionContainer(catalog)
Try
ChartContainer.ComposeParts(Me)
Catch ex As Exception
Console.WriteLine(ex.ToString)
End Try
End Sub
' must use Lazy otherwise instantiation of Window will hold open app. Otherwise must specify Shutdown Mode of "Shutdown on Main Window".
<ImportMany()> _
Public Property ChartDescriptions As IEnumerable(Of Lazy(Of ICharts, IDictionary(Of String, Object)))
End Class