Trouble looping through a selection set where feature type is polyline which is part of a topology class.

LawrenceHartpence — Thu, 31 Aug 2017 12:26:09 GMT

Hello.

I have code that loops through selected features and updates an attribute for those features. The code throws an error at runtime when the featureclass is a polyline type which participates in a topology class. The error seems to happen at iSelectionset.Update. Below is the entire function. Any ideas would be appreciated.

Private Sub txtRFrom_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtRFrom.KeyPress
If Asc(e.KeyChar) = 13 Or Asc(e.KeyChar) = 9 Then
If cmbLayer.SelectedIndex = -1 Then
MsgBox("Please Select an Edit Layer!!")
Exit Sub
End If

Dim intValue As Integer

If Not Integer.TryParse(txtRFrom.Text, intValue) Then
txtRTo.Focus()
Exit Sub
End If

Dim pfLayer As IFeatureLayer
pfLayer = FindLayerByName(cmbLayer.SelectedItem)

Dim pfClass As IFeatureClass
pfClass = pfLayer.FeatureClass

Dim pfeatsel As IFeatureSelection
pfeatsel = pfLayer

Dim pSelectionSet As ISelectionSet2
pSelectionSet = pfeatsel.SelectionSet

If pSelectionSet.Count = 0 Then
MsgBox("No features selected!!")
Exit Sub
End If

Dim pFeatureCursor As IFeatureCursor
pFeatureCursor = Nothing

Dim pFeature As IFeature

'update the selectionset setting the IQueryFilter object to Nothing

pSelectionSet.Update(Nothing, False, pFeatureCursor)

pFeature = pFeatureCursor.NextFeature

Do Until pFeature Is Nothing

pFeature.Value(pFeature.Fields.FindField("RFromAddr")) = txtRFrom.Text

pFeatureCursor.UpdateFeature(pFeature)
pFeature = pFeatureCursor.NextFeature

txtRTo.Focus()
Loop
End If

End Sub

Re: Trouble looping through a selection set where feature type is polyline which is part of a topology class.

DuncanHornby — Mon, 18 Sep 2017 10:28:11 GMT

If you want people to help I suggest you edit your question and ensure formatting of code is on as it makes it easier to read. Have a look here if you do not know how to do this.

If you read the API help for the Update method, it states at the bottom:

All edits to features that participate in a Topology or Geometric Network must be bracketed within an edit operation.

Your code does not indicate if an Edit operation has been started so I'm guessing that is the issue.

topic Re: Trouble looping through a selection set where feature type is polyline which is part of a topology class. in ArcObjects SDK Questions

Trouble looping through a selection set where feature type is polyline which is part of a topology class.

Re: Trouble looping through a selection set where feature type is polyline which is part of a topology class.