vb+ae属性查询函数

  '属性查询函数
    Private Sub QueryByAttribute(ByRef operator As esriSelectionResultEnum)
        Dim pFeatureLayer As IGeoFeatureLayer
        Dim j As Integer
        Dim i As Integer
        Dim pFeatureselection As IFeatureSelection
        Dim pActiveView As IActiveView
        Dim pFields As IFields
        Dim pField As IField
        Dim FieldID As Integer
        Dim operatorString As String
        Dim whereClause As String
        Dim pFilter As IQueryFilter
        Dim attName As String
        Dim attValue As Object

        On Error GoTo ErrorHandler

        '选择一个查询的条件，从下面的COMBO中。
        If ((lstAttribute.SelectedItems.Count <1) Or (txtValue.Text = "")) Then
            GiveWarning("警告", "你必须选择一个属性值!")
            Exit Sub
        End If

        For i = 0 To lstAttribute.Items.Count - 1
            If (lstAttribute.GetSelected(i)) Then
                attName = VB6.GetItemString(lstAttribute, i)
                i = lstAttribute.Items.Count
            End If
        Next i

        Select Case cboOperator.Text
            Case "等于"
                operatorString = "="
            Case "不等于"
                operatorString = "<>"
            Case "小于"
                operatorString = "<"
            Case "大于"
                operatorString = ">"
            Case "小于或等于"
                operatorString = "<="
            Case "大于或等于"
                operatorString = ">="
        End Select

        pActiveView = m_pMap
        pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, Nothing, Nothing)
        For j = 0 To lstClass.Items.Count - 1
            If (lstClass.GetSelected(j)) Then
word="vbup1037"”
                If (FoundLayer(VB6.GetItemString(lstClass, j), pFeatureLayer)) Then
                    pFeatureselection = pFeatureLayer
                    If (pFeatureLayer.Selectable) Then
                        ' Must convert the attribute value to the correct type
                        '必须以准确的类型传递属性值。
                        pFields = pFeatureLayer.FeatureClass.Fields
                        FieldID = pFeatureLayer.FeatureClass.FindField(attName)
                        pField = pFields.Field(FieldID)
                        attValue = txtValue.Text
                        Select Case pField.Type
                            '字段的类型。
                        Case esriFieldType.esriFieldTypeInteger
                                attValue = CShort(attValue)
                            Case esriFieldType.esriFieldTypeSingle
                                attValue = CShort(attValue)
                            Case esriFieldType.esriFieldTypeSmallInteger
                                attValue = CShort(attValue)
                            Case esriFieldType.esriFieldTypeDouble
                                attValue = CDbl(attValue)
                            Case esriFieldType.esriFieldTypeOID
                                attValue = CInt(attValue)
                            Case esriFieldType.esriFieldTypeString
                                attValue = CStr(attValue)
                                attValue = "'" & CStr(attValue) & "'"
                        End Select
                        whereClause = attName & operatorString & " " & CStr(attValue)
                        '设置条件，进行查询过滤。
                        pFilter = New QueryFilter
                        pFilter.SubFields = "*"
                        pFilter.WhereClause = whereClause
                        pFilter.OutputSpatialReference(attName) = m_pMap.SpatialReference
                        pFeatureselection.SelectFeatures(pFilter, operator, False)
                    Else
                        If (operator = esriSelectionResultEnum.esriSelectionResultNew) Then pFeatureselection.Clear()
                    End If
                End If
            Else
word="vbup1037"”
                If (FoundLayer(VB6.GetItemString(lstClass, j), pFeatureLayer)) Then
                    pFeatureselection = pFeatureLayer
                    If ((operator = esriSelectionResultEnum.esriSelectionResultNew) Or (operator = esriSelectionResultEnum.esriSelectionResultAnd)) Then pFeatureselection.Clear()
                End If
            End If
        Next j
        System.Diagnostics.Debug.WriteLine(pFeatureLayer.Name)
        pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, Nothing, Nothing)
        '  m_pApp.StatusBar.message(0) = "被选择的对象数目为: " & CStr(m_pMap.SelectionCount)
        RefreshSelectButtons()

        Exit Sub
ErrorHandler:
        MsgBox("An unexpected error has occured with the Selection Dialog." & vbCr & vbCr & "Details : " & Err.Description, MsgBoxStyle.Exclamation + MsgBoxStyle.OKOnly, "Error")
    End Sub