幾種批量刪除feature的方法

1.批量刪除feature ----ITable.DeleteSearchedRows  method

對于一般的featureClass(不包括Anno FeatureClass),ITable.DeleteSearchedRows能快速有效的刪除Features.

尤其是大數據量情況下,其效率遠比逐個要素刪除要快得多。

Public   Sub DeleteFeature() Sub DeleteFeature(pFeaWorkspace As IFeatureWorkspace, pfeatName As String)
    'Delete feature class
    Dim pFeatureClass As IFeatureClass
    Set pFeatureClass = pFeaWorkspace.OpenFeatureClass(pfeatName)
    On Error Resume Next
    If pFeatureClass Is Nothing Then
        Exit Sub
    End If
    
    Dim pTable As ITable
    Set pTable = pFeatureClass
    pTable.DeleteSearchedRows Nothing
    
    
End Sub

 

2. 批量刪除Annotation featureclass里的features ---IFeatureEdit.DeleteSet method.

 ITable.DeleteSearchedRows用來刪除Annotation featureclass要素的效果并不好，很多時候是根本沒刪除到數據.

IFeatureEdit.DeleteSet方法在這時候能很好的派上用場，由于是DeleteSet,所以遇到某些相關聯要素時，不會發生像

IFeatureCursor.nextfeature單個刪除時找不到要素的問題。

 

Public   Sub DeleteAnnoFeature() Sub DeleteAnnoFeature(pFeaWorkspace As IFeatureWorkspace, pfeatName As String)


    'Delete feature class
    Dim pFeatureClass As IFeatureClass
    Set pFeatureClass = pFeaWorkspace.OpenFeatureClass(pfeatName)
    On Error Resume Next
    If pFeatureClass Is Nothing Then
        Exit Sub
    End If
    
    Dim pDeleteSet As esriSystem.ISet
    Set pDeleteSet = New esriSystem.Set
    Dim pFeature As IFeature
    Dim pFeatureCursor As IFeatureCursor
    Set pFeatureCursor = pFeatureClass.Search(Nothing, False)
   
    Set pFeature = pFeatureCursor.NextFeature
    Do While Not pFeature Is Nothing
        pDeleteSet.Add pFeature
        Set pFeature = pFeatureCursor.NextFeature
    Loop
    
    pDeleteSet.Reset
    
    Dim pFeatureEdit As IFeatureEdit
    Set pFeatureEdit = pDeleteSet.Next
    Do While Not pFeatureEdit Is Nothing
        pFeatureEdit.DeleteSet pDeleteSet
        Set pFeatureEdit = pDeleteSet.Next
    Loop
    
     
End Sub

 

3. 批量刪除要素的一般方法.

Public   Sub DeleteAnnoFeature() Sub DeleteAnnoFeature()Sub DeleteAnnoFeature()Sub DeleteAnnoFeature(pFeaWorkspace As IFeatureWorkspace, pfeatName As String)

    'Delete feature class
    Dim pFeatureClass As IFeatureClass
    Set pFeatureClass = pFeaWorkspace.OpenFeatureClass(pfeatName)
    On Error Resume Next
    If pFeatureClass Is Nothing Then
        Exit Sub
    End If
    
    Dim pFeature As IFeature
    Dim pFeatureCursor As IFeatureCursor
    Set pFeatureCursor = pFeatureClass.Search(Nothing, False)
   
    Set pFeature = pFeatureCursor.NextFeature
    Do While Not pFeature Is Nothing
        pFeature.delete
        Set pFeature = pFeatureCursor.NextFeature
    Loop
      
    set pFeatureClass=nothing   
End Sub

 

 

4. 在FeatureLayer上刪除features...利用IFeatureEdit.DeleteSet

Public   Sub DeleteSelectedFeatures() Sub DeleteSelectedFeatures()
  Dim pDeleteSet As ISet
  Dim pEditLayers As IEditLayers
  Dim pEditor As IEditor
  Dim pEnumLayer As IEnumLayer
  Dim pFeature As IFeature
  Dim pFeatureEdit As IFeatureEdit
  Dim pFeatureCursor As IFeatureCursor
  Dim pFeatureLayer As IFeatureLayer
  Dim pFeatureSelection As IFeatureSelection
  Dim pID As New UID
  Dim pInvalidArea As IInvalidArea
  Dim pSelectionSet As ISelectionSet
  Dim bInOperation As Boolean
  Dim DeletedFeatureCount As Integer
  Dim LayerCount As Integer
  
  On Error GoTo ErrorHandler
  
  ''Get a handle to the Editor extension
  pID = "esriEditor.Editor"
  Set pEditor = Application.FindExtensionByCLSID(pID)
  If Not pEditor.EditState = esriStateEditing Then Exit Sub
  Set pEditLayers = pEditor
  
  If pEditor.SelectionCount = 0 Then Exit Sub
  
  'Set up the InvalidArea object
  Set pInvalidArea = New InvalidArea
  Set pInvalidArea.Display = pEditor.Display
  
  'Loop through the selected features and delete them
  pEditor.StartOperation
  bInOperation = True
  
  pID = "{40A9E885-5533-11D0-98BE-00805F7CED21}" 'IGeoFeatureLayer
  Set pEnumLayer = pEditor.Map.Layers(pID, True)
  pEnumLayer.Reset
  
  Set pFeatureLayer = pEnumLayer.Next
  Do While Not pFeatureLayer Is Nothing
    'Check if feature layer is editable
    If pEditLayers.IsEditable(pFeatureLayer) Then
      Set pFeatureSelection = pFeatureLayer
      Set pSelectionSet = pFeatureSelection.SelectionSet
      ''Check if there is a selection
      If Not pSelectionSet.Count = 0 Then

        'Add each feature to a Set
        'and delete the set - need a Set incase there are related features
          Set pDeleteSet = New esriSystem.Set
          pSelectionSet.Search Nothing, False, pFeatureCursor
          Set pFeature = pFeatureCursor.NextFeature
          Do While Not pFeature Is Nothing
            pInvalidArea.Add pFeature
            pDeleteSet.Add pFeature
            DeletedFeatureCount = DeletedFeatureCount + 1
            Set pFeature = pFeatureCursor.NextFeature
          Loop
          pDeleteSet.Reset
          Set pFeatureEdit = pDeleteSet.Next
          Do While Not pFeatureEdit Is Nothing
            pFeatureEdit.DeleteSet pDeleteSet
            Set pFeatureEdit = pDeleteSet.Next
          Loop

      End If
    End If
    Set pFeatureLayer = pEnumLayer.Next
  Loop

  If DeletedFeatureCount = 0 Then
    pEditor.AbortOperation
  Else
    pEditor.StopOperation ("Delete")
    bInOperation = False
  End If
  
  'Clear the selection and refresh the display
  pEditor.Map.ClearSelection
  pInvalidArea.Invalidate esriAllScreenCaches

  Exit Sub
  
ErrorHandler:
  If bInOperation Then
    pEditor.AbortOperation
  End If
End Sub