Good way to add context-sensitive help to an existing Windows Forms application?

Question

Hi,

I have to add database-driven tooltips to an existing WinForms App, big one. C# and .NET 3.5

I'd like to avoid having to drop new controls for this, and the user has to be able to edit the help tooltips.

My best guess is to wrap the existing controls in a new type that contains new properties, so that I can assign a new property like "FieldHelpName", and can use that in the administrative module so the user can identify the field clearly. I'd assign a ScreenID to each form and each FieldHelpName record would be linked to a ScreenID. At application startup, load all the help contents, and on form-load, filter by its ScreenID and add the corresponding tooltips using reflection, most likely.

I'm looking for suggestions on how to do this process best or to know if there are any best practices on how to do this...so any help is really appreciated. Thanks.

Answer 1

Why go into such lengths?

You can accomplish the same thing with something simpler:

Private _ToolTipList As New List(Of ToolTip)

<Extension()> _
Public Function CreateForm(ByVal formType As Type) As Form
  If (formType Is Nothing) Then
    Throw New ArgumentNullException("formType")
  End If
  If (Not GetType(Form).IsAssignableFrom(formType)) Then
    Throw New InvalidOperationException _
        (String.Format("The type '{0}' is not a form.", formType.FullName))
  End If

  Dim ctor = formType.GetConstructor(New Type() {})
  If (ctor Is Nothing) Then
    Throw New InvalidOperationException _
        (String.Format _
            ("The type '{0}' does not have a public default constructor.", _
            formType.FullName))
  End If

  Dim frm As Form = ctor.Invoke(New Object() {})
  Dim toolTip As New ToolTip(New Container())
  LoadToolTipData(toolTip, frm)
  _ToolTipList.Add(toolTip)

  Return frm

End Function

Private Sub LoadToolTipData(ByVal toolTip As ToolTip, _
                            ByVal ctrl As Control, _
                   Optional ByVal parentHierarchy As String = "")

  Dim currentHierarchy = parentHierarchy & "." & ctrl.Name
  Dim toolTipText = LoadDataFromDb(currentHierarchy)
  If Not String.IsNullOrEmpty(toolTipText) Then
    toolTip.SetToolTip(ctrl, toolTipText)
  End If

  For Each c As Control In ctrl.Controls
    LoadToolTipData(toolTip, c, currentHierarchy)
  Next

End Sub

Private Function LoadDataFromDb(ByVal key As String) As String
  Return String.Empty
End Function