我需要一些幫助,因爲我是啓用基於事件的按鈕的vb.net的新用戶。該場景是我有一個列表視圖基於訪問查詢一次填充100個記錄。似乎有兩個主要的編碼領域。基於列表視圖項啓用按鈕
1)啓用「下一步」按鈕,但前提是數據庫中有超過100條記錄。這意味着我需要首先運行查詢來獲取總行數。將此計數存儲在類級變量中,然後在填充列表時,如果此計數大於100,則啓用下一個按鈕。我也需要保持當前的頁碼數量。當用戶按下Next按鈕時,它會加載下100行,然後檢查是否仍需要通過檢查PageNumber * 100是否小於行數來啓用Next按鈕。
2)必須使上一個按鈕,如果當前頁面數不爲1
我將不勝感激,如果有人能夠幫助這或點我獲得進一步幫助的方向。非常感謝
Sub filllistview()
Try
'creatconn()
oledbCnn.ConnectionString = My.Settings.storageConnectionString
oledbCnn.Open()
Dim oledbCmd As OleDbCommand = New OleDbCommand("Select TOP 100 * from Postings WHERE Customer = '" & newvar & "' ORDER BY Date DESC", oledbCnn)
dr = oledbCmd.ExecuteReader()
Dim tmpColor As Color = Color.Green
'clear items in the list before populating with new values
ListView1.Items.Clear()
While dr.Read()
ListView1.Items.Add(CDate(dr(4)).ToShortDateString()).UseItemStyleForSubItems = False
ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(dr(1).ToString())
ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(dr(11).ToString())
ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(dr(7).ToString())
With ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(CDbl(dr(5)).ToString("C"))
If CDbl(dr(5)) < 0 Then
.ForeColor = Color.Red
.BackColor = Color.Gainsboro
'.Font = New Font(Font.FontFamily, Font.Size, FontStyle.Bold)
Else
.ForeColor = tmpColor
End If
End With
ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(dr(14).ToString())
ListView1.Items(ListView1.Items.Count - 1).SubItems.Add(dr(3).ToString())
End While
'autosize each column in listview
For Each col As ColumnHeader In ListView1.Columns
col.Width = -2
Next col
'refresh the list with new data
ListView1.Refresh()
'Enable the posting previous button
'btnNextPostings.Enabled = True
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
dr.Close()
oledbCnn.Close()
End Try
End Sub
您可以考慮使用[bindingNavigator(http://msdn.microsoft.com/en-us/library/system.windows.forms.bindingnavigator (v = vs.110)的.aspx)。它由下一個,之前的aso按鈕組成或在[wpf]中使用somthing euqivalent(http://social.msdn.microsoft.com/Forums/en-US/1f392098-0e52-47fc-9338-ce1f7edbe61c/binding-navigator- in-wpf-xaml) –
是你要求的winForms或WPF嗎? –
winforms。謝謝 – user1532468