在 VB.net 中折叠 Treeview 节点时的问题

Question

我在通过单击子节点打开表单然后关闭该表单时遇到 TreeView 问题（FormClosed 事件中确实包含 Me.Close() 和 Me.Dispose()）。折叠父节点后出现问题，之前的表单再次打开。 表单从 Treeview AfterSelect 事件中打开。

    Private Sub TreeView1_AfterSelect(sender As Object, e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
    Dim rc%, i%

    Dim daFoodCat As New OleDbDataAdapter("Select * FROM tblFoodCategories INNER JOIN tblRecipes " & _
                                          "ON tblFoodCategories.RecipeID = tblRecipes.RecipeID " & _
                                          "ORDER BY RecipeName", cn)
    Dim dsRecipeName As DataSet = New DataSet
    daFoodCat.Fill(dsRecipeName, "tblFoodCategories")
    rc = dsRecipeName.Tables(0).Rows.Count

    For i = 0 To rc - 1
        If dsRecipeName.Tables(0).Rows(i).Item("RecipeName") = e.Node.Text Then
            rcpID = dsRecipeName.Tables(0).Rows(i).Item("tblRecipes.RecipeID")
        End If
    Next

    If rcpID = 0 Then
        'Do nothing
    Else
        frmRecipes.ShowDialog()
    End If


End Sub

Answer 1

我通过在 frmRecipes.ShowDialog() 之后添加 rcpID = 0 解决了这个问题。