所选索引的组合框值减少已更改 [英] combo box value decrements on selected index changed
问题描述
HI全部,
我正在开发Window应用程序..我有一个组合框,其值为0,3,7,20 ...我加载来自Datatable的组合框,如下面的代码;
HI All,
I am working on Window application..I have a combo box with values like 0,3,7 ,20...I load the combo box from the Datatable like the code below;
Dim m_dtDelayedDeliveryDays As New DataTable
m_dtDelayedDeliveryDays = GetDelayedDeliveryDays()
For Each dr As DataRow In m_dtDelayedDeliveryDays.Rows
Me.cmbDelayedDeliveryDays.Items.Add(dr("DeliveryDelayDays"))
Next
cmbDelayedDeliveryDays.DataSource = m_dtDelayedDeliveryDays
cmbDelayedDeliveryDays.DisplayMember = "DeliveryDelayDays"
cmbDelayedDeliveryDays.ValueMember = "DeliveryDelayDaysID"
cmbDelayedDeliveryDays.SelectedIndex = -1
这很好..当所选索引发生变化时说例如我选择20它会自动更改为0 ...这是我在选择的索引中所做的更改:
This works fine..When the selected index gets changed say for example i select 20 it automatically changes to 0...Here is wat i do in Selected index changed:
Private Sub cmbDelayedDeliveryDays_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles cmbDelayedDeliveryDays.SelectedIndexChanged
If cmbDelayedDeliveryDays.SelectedIndex > 0 Then
Dim selectedDataRow As DataRow = DirectCast(cmbDelayedDeliveryDays.SelectedItem, DataRowView).Row
Dim delayId As Integer = Convert.ToInt32(selectedDataRow("DeliveryDelayDaysID"))
UpdateMerchant()
End If
End Sub
请帮我解决这个问题...当我检索表单时,我会收到表单,我将数据库中的值分配给组合框,如下所示:
Please help me with this...When i retrieve the form i get the form i assign the combo box the value from the database like this:
Dim delayid As Integer = .DeliveryDelayDaysID
Dim m_dtDelayedDeliveryDays As New DataTable
m_dtDelayedDeliveryDays = GetDelayedDeliveryDays()
Dim str As Integer
For Each drow As DataRow In m_dtDelayedDeliveryDays.Rows
If drow("DeliveryDelayDaysID").Equals(delayid) Then
str = drow("DeliveryDelayDays")
cmbDelayedDeliveryDays.Text = str
End If
Next
我哪里错了..请帮助。谢谢。
Where am i going wrong..Please help.Thanks.
推荐答案
您在下面的代码中将SelectedValue指定为-1,因为它正在分配默认值,即零:
You are assigning the SelectedValue as -1 in the below code, due to which it is assigning the default value, which is zero:
cmbDelayedDeliveryDays.DataSource = m_dtDelayedDeliveryDays
cmbDelayedDeliveryDays.DisplayMember = "DeliveryDelayDays"
cmbDelayedDeliveryDays.ValueMember = "DeliveryDelayDaysID"
cmbDelayedDeliveryDays.SelectedIndex = -1 //评论此行并再次检查。
希望这可以解决您的问题...
如果有任何疑问,请告诉我。
cmbDelayedDeliveryDays.SelectedIndex = -1 //Comment this line and check again.
Hope this solve your issue...
If any queries do let me know.
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