当查询包含超过15000个包含9个子项的列表时,从查询中填充ListView的最快方法是什么。加载我需要大约6分钟。
这是我为填充ListView控件所写的内容。
Set rs = db.OpenRecordset(strSQL, dbOpenForwardOnly, dbReadOnly)
With Me.listViewData
.View = lvwReport
.GridLines = True
.FullRowSelect = True
.ListItems.Clear
.ColumnHeaders.Clear
End With
'Set up column headers
With Me.listViewData.ColumnHeaders
.Add , , "Client", 1440, lvwColumnLeft
.Add , , "Contact", 2160, lvwColumnLeft
.Add , , "Quote #", 720, lvwColumnCenter
.Add , , "Date", 1140, lvwColumnLeft
.Add , , "GrandTotal", 1440, lvwColumnRight
.Add , , "Weighted Value", 1440, lvwColumnRight
.Add , , "Chance %", 500, lvwColumnRight
.Add , , "Sales Cycle", 1140, lvwColumnRight
.Add , , "Won Orders", 1000, lvwColumnRight
.Add , , "SalesRep", 1000, lvwColumnRight
End With
While Not rs.EOF
Set lstItem = Me.listViewData.ListItems.Add()
lstItem.Text = Nz(rs!Name, "")
lstItem.SubItems(1) = Nz(rs!Company, "")
lstItem.SubItems(2) = Nz(rs!QuoteNumber, "")
lstItem.SubItems(3) = Nz(rs!OrderDate, "")
lstItem.SubItems(4) = Nz(Format(rs!GrandTotal, "Currency"), "0.00")
lstItem.SubItems(5) = Nz(Format(rs!GrandTotal * rs!Customfield1 / 100, "Currency"), "")
lstItem.SubItems(6) = Nz(rs!Customfield1, "")
lstItem.SubItems(7) = Nz(rs!Date1, "none")
lstItem.SubItems(8) = Nz(rs!Detail, "")
lstItem.SubItems(9) = Nz(rs!CustomT1, Nz(rs!UserID, ""))
For I = 1 To Me.listViewData.ColumnHeaders.Count - 1
Set sb = lstItem.ListSubItems(I)
If rs!Customfield1 = 100 Or Not IsNull(rs!List) Then
sb.ForeColor = vbBlue
lstItem.ForeColor = vbBlue
ElseIf rs!Cancelled = -1 Then
sb.ForeColor = vbRed
lstItem.ForeColor = vbRed
Else
sb.ForeColor = vbBlack
lstItem.ForeColor = vbBlack
End If
DoEvents
Next
rs.MoveNext
Wend
答案 0 :(得分:2)
你应该做的第一件事是摆脱“doevents”这是一个真正的性能杀手。
您是否必须动态加载listview?为什么不直接将其绑定到数据源?
答案 1 :(得分:1)
我可以想到几件事:
虽然...... Wend是一种较慢的循环机制;使用For ... Next。 For ... Next更快 - 即使您必须运行另一个命令来获取RecordCount。这就是我使用的:
With rs
If .RecordCount > 0 Then
'-- MoveLast...MoveFirst will update the .RecordCount; depending on the type of DAO Recordset, RecordCount might only return "1" when there are more than that.
.MoveLast
.MoveFirst
For lngCounter = 1 To .RecordCount
'-- Code to add ListItems here
.MoveNext
Next lngCounter
End If
.Close
End With
使用...结束用于添加子项:
With Me.listViewData.ListItems.Add
.Text = Nz(rs!Name, "")
.SubItems(1) = Nz(rs!Company, "")
.SubItems(2) = Nz(rs!QuoteNumber, "")
.SubItems(3) = Nz(rs!OrderDate, "")
.SubItems(4) = Nz(Format(rs!GrandTotal, "Currency"), "0.00")
.SubItems(5) = Nz(Format(rs!GrandTotal * rs!Customfield1 / 100, "Currency"), "")
.SubItems(6) = Nz(rs!Customfield1, "")
.SubItems(7) = Nz(rs!Date1, "none")
.SubItems(8) = Nz(rs!Detail, "")
.SubItems(9) = Nz(rs!CustomT1, Nz(rs!UserID, ""))
End With
将populater代码包装在:
DoCmd.Echo False
'-- Populate code
DoCmd.Echo True
希望有所帮助!
答案 2 :(得分:0)
检查Listview控件的方法,例如beginupdate / endupdate或将refresh设置为false(如果可能)。这意味着在添加每个项目后,UI不会尝试刷新屏幕,从而使添加速度更快。
Listview控件旨在获取大量项目,因此可以进行一些挖掘。