Dynamic panel element adding and scrollbars

问题

I wrote a function to dynamically add elements to the "Panel".

public int State;        
public Point Point = new Point(0, 0);
public void DialogAdd(string message, string author)
        {
            var d = new DialogMessage();
            if(State == 0)
            {
                d.BackColor = Color.FromArgb(255, 237, 241, 245);
                State = 1;
            }
            else
            {
                State = 0;
            }


            d.Controls["name"].Text = author;
            d.Location = new Point(0, Point.Y);
            d.Controls["msg"].Text = message;
            Point.Y += d.Size.Height;
            Controls["panel1"].Controls.Add(d);

        }

DialogMessage is UserControl, that haves property "AutoSize=true" on all components. This panel has got the AutoScroll property, so has got scrollbars. The problem is that the elements are added in different ways, depending on the position of the scrollbar. If the scrollbar is at the top, then all added as needed.

but if at the time of adding the scrollbar at the bottom, then add items going wrong

please tell me what I'm doing wrong and how to fix it? Thank you. sorry for bad english

回答1:

When placing the controls inside the panel, you have to compensate for the scroll position:

Basically, try using this line:

d.Location = new Point(0, panel1.AutoScrollPosition.Y + Point.Y);

来源：https://stackoverflow.com/questions/8885342/dynamic-panel-element-adding-and-scrollbars