c# – Visual Studio中的折叠区域

Dim _outliningManager As Outlining.IOutliningManager
Dim _oldCollapsedRegions As List(Of ICollapsed)

'Getting access to ServiceProvider
<Import>
Dim ServiceProvider As SVsServiceProvider

'Getting IOutliningManagerService object
 Dim componentModel As IComponentModel = ServiceProvider.GetService(GetType(SComponentModel))
 Dim outliningManagerService As IOutliningManagerService = componentModel.GetService(Of IOutliningManagerService)()

    'Creating IOutliningManager for current textView
    If outliningManagerService IsNot Nothing Then
        _outliningManager = outliningManagerService.GetOutliningManager(textView)
        If _outliningManager IsNot Nothing Then AddHandler _outliningManager.RegionsCollapsed,AddressOf RegionCollapsed

    End If

    'Getting all regions and expand them
    If _outliningManager IsNot Nothing Then
        Dim snapshot = _textView.TextSnapshot
        Dim snapshotSpan = New Microsoft.VisualStudio.Text.SnapshotSpan(snapshot,New Microsoft.VisualStudio.Text.Span(0,snapshot.Length))
        _oldCollapsedRegions = _outliningManager.GetCollapsedRegions(snapshotSpan).ToList()
        For Each reg In _oldCollapsedRegions
            _outliningManager.Expand(reg)
        Next
    End If


'Blocking regions collapsed
Sub RegionCollapsed(sender As Object,e As RegionsCollapsedEventArgs)
    If Me.Visibility = Windows.Visibility.Visible Then
        For Each reg In e.CollapsedRegions
            _outliningManager.Expand(reg)
        Next
    End If
End Sub

需要参考：microsoft.visualstudio.shell.immutable.10.0,Microsoft.VisualStudio.ComponentModelHost,当然,Microsoft.VisualStudio.Text