是我的错误:请将窗口1的
AfterLoad事件代码改成:Dim cmd As New SQLCommandDim dt As DataTablecmd.Ccmd.CommandText = "SELECT DISTINCT 产品,客户 From 订单2"dt = cmd.ExecuteReader()Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")trv.BuildDataTree(dt, "","产品", "客户")