Question

我有一个.NET项目，其中包含一个UltraWinGrid来显示数据库表中的数据。在UWG的表格上，我有3个按钮; “新数据”，“编辑数据”和“删除数据”。前两个用控件打开新表单，通过控件输入/编辑要保存的数据。保存功能正常，但是当我关闭表单以查看初始表单（使用UWG）时，数据没有刷新，只有当我关闭并重新打开它时才会刷新。

那么，当我按下新表格上的保存按钮时，有什么方法可以让UWG刷新？（我已经尝试再次调用加载UWG的函数，但这不起作用，因为连接不能使它成为共享方法）

保存功能代码：

    Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click

    Dim m_cn As New OleDbConnection
    m_cn = m_database.getConnection()


    If txtFirstName.Text = "" Then
        MsgBox("First name cannot be blank")

    ElseIf txtLastName.Text = "" Then
        MsgBox("Last name cannot be blank")

    ElseIf txtAge.Text = "" Then
        MsgBox("Age cannot be blank")

    ElseIf txtPostCode.Text = "" Then
        MsgBox("Postcode cannot be blank")

    Else
        Dim personID As Integer = database.SaveNewPerson(txtFirstName.Text, txtLastName.Text, txtAge.Text, txtPostCode.Text, m_cn)

        MsgBox("Save successful")

        txtFirstName.Text = ""
        txtLastName.Text = ""
        txtAge.Text = ""
        txtPostCode.Text = ""

    End If

End Sub

加载UWG的代码：

 Public Sub getPeople()

    Try
        Dim sql As String = "SELECT * FROM tblPerson"
        Dim cm As New OleDbCommand(sql, m_database.getConnection())
        Dim da As New OleDbDataAdapter(cm)
        Dim dt As New DataTable()
        da.Fill(dt)
        ugData.DataSource = dt

    Catch Ex As Exception
        MsgBox("Could not load people")
    End Try

End Sub

Answer 1

您应该在呼叫表单中调用getPeople功能，而不是在保存表单中您只需要知道保存表单是否已正确终止，并且此信息可用作对ShowDialog的调用的返回值。保存人员数据的按钮应将DialogResult属性设置为OK，然后此代码应该适合您

' Open the form that inserts a new person
' Change that name to your actual form class name...
Using fp = new frmPerson()

   ' If the user presses the button to save and everything goes well
   ' we get the DialogResult property from the button pressed 
   if fp.ShowDialog() = DialogResult.OK Then

       ugData.DataSource = Nothing
       getPeople()

   End If
End Using

注意点如果一切顺利。这意味着如果在您的按钮保存过程中某些操作不顺利，则应该阻止表单关闭，将DialogResult属性更改为None。

Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click

    Dim m_cn As New OleDbConnection
    m_cn = m_database.getConnection()


    If txtFirstName.Text = "" Then

        MsgBox("First name cannot be blank")
        Me.DialogResult = DialogResult.None
    ElseIf txtLastName.Text = "" Then
        MsgBox("Last name cannot be blank")
        Me.DialogResult = DialogResult.None
    ElseIf txtAge.Text = "" Then
        MsgBox("Age cannot be blank")
        Me.DialogResult = DialogResult.None
    ElseIf txtPostCode.Text = "" Then
        MsgBox("Postcode cannot be blank")
        Me.DialogResult = DialogResult.None
    Else
        Dim personID As Integer = database.SaveNewPerson(txtFirstName.Text, txtLastName.Text, txtAge.Text, txtPostCode.Text, m_cn)

        MsgBox("Save successful")

        txtFirstName.Text = ""
        txtLastName.Text = ""
        txtAge.Text = ""
        txtPostCode.Text = ""
    End If
End Sub

UltraWinGrid刷新单独的表单按钮按下

1 个答案: