为什么在运行时添加控件时会出现定位问题？

Question

我对C＃用户控件有一个相当奇怪的问题。基本上它是一个面板，您可以通过按下按钮添加控件行。

当用户按下按钮时，会添加一组新控件作为行。代码非常简单，只需设置属性并将它们添加到面板，如下所示：

    private void AddCommentControls()
    {
        _noOfComments++;

        ComboBox tempCbCategory = new ComboBox();
        TextBox tempTxtRoomNo = new TextBox();
        ComboBox tempPositive = new ComboBox();
        TextBox tempTxtComment = new TextBox();

        tempCbCategory.Name = "cbCategory" + _noOfComments.ToString();
        tempTxtRoomNo.Name = "txtRoomNo" + _noOfComments.ToString();
        tempPositive.Name = "cbPositive" + _noOfComments.ToString();
        tempTxtComment.Name = "txtComment" + _noOfComments.ToString();

        tempCbCategory.Location = controls["cbCategory" + (_noOfComments - 1).ToString()].Location;
        tempCbCategory.FormattingEnabled = true;
        tempCbCategory.Size = new Size(119, 21);
        tempCbCategory.Location = new Point(tempCbCategory.Location.X, (tempCbCategory.Location.Y + tempCbCategory.Height + 50));

        controls.Add("cbCategory" + _noOfComments.ToString(), tempCbCategory);

        pnlBg.Controls.Add(tempCbCategory);

        tempTxtRoomNo.Location = controls["txtRoomNo" + (_noOfComments - 1).ToString()].Location;
        tempTxtRoomNo.Size = new Size(68, 21);
        tempTxtRoomNo.Location = new Point(tempTxtRoomNo.Location.X, (tempTxtRoomNo.Location.Y + tempTxtRoomNo.Height + 50));
        controls.Add("txtRoomNo" + _noOfComments.ToString(), tempTxtRoomNo);

        pnlBg.Controls.Add(tempTxtRoomNo);

        tempPositive.Location = controls["cbPositive" + (_noOfComments - 1).ToString()].Location;
        tempPositive.Size = new Size(46, 21);
        tempPositive.FormattingEnabled = true;
        tempPositive.Items.AddRange(new object[] {"Yes", "No"});
        tempPositive.Text = "Yes";
        tempPositive.Location = new Point(tempPositive.Location.X, (tempPositive.Location.Y + tempPositive.Height + 50));

        controls.Add("cbPositive" + _noOfComments.ToString(), tempPositive);

        pnlBg.Controls.Add(tempPositive);

        tempTxtComment.Location = controls["txtComment" + (_noOfComments - 1).ToString()].Location;
        tempTxtComment.Size = new Size(437, 57);
        tempTxtComment.Location = new Point(tempTxtComment.Location.X, (tempTxtComment.Location.Y + tempTxtComment.Height + 50));
        tempTxtComment.Multiline = true;

        controls.Add("txtComment" + _noOfComments.ToString(), tempTxtComment);

        pnlBg.Controls.Add(tempTxtComment);
    }

我的问题是在添加了几个控件之后，组合框（或文本框，我无法确定哪个）随着“行”数量的增加而上升/下降的速度越来越大，如此处所示：

我已经经历了这么多次并且必须错过一些明显的东西，但我需要对它进行排序以便我继续前进！

非常感谢任何帮助。

问候，丹尼尔。

编辑：如果有人感兴趣，这是在实施接受的答案后的结果：

Answer 1

1. 制作行自定义控件
2. 使用FlowLayoutPanel从上到下排列您的行+如果它会溢出主容器，您将拥有滚动条。

Answer 2

将tempCbCategory;tempTxtRoomNo;tempPositive;tempTxtComment放入用户控件中。或者在设置尺寸之前将tempTxtRoomNo和tempTxtComment：AutoSize设置为False。