C# WinForm panel 動態增加(自創)元件(UserControl)

Code:

 private void rjButton1_Click(object sender, EventArgs e)
        {
            panel1.AutoScroll = true;//允許Scroll Bar
            panel1.Controls.Clear();//清空所有子元件

            //---
            //基礎定位點參數
            int w = 10;//基本定位點
            int h = 10;
            int column = 0;//列數
            int row = 3;//行數
            //---基礎定位點參數
            
            ArrayList arrayList= new ArrayList();//元件陣列
            for(int i=0;i<5;i++)//動態產生子元件並放到ArrayList
            {
                TakeawaysInfo TakeawaysInfoBuf=new TakeawaysInfo();
                TakeawaysInfoBuf.Name = $"TakeawaysInfo{i}";
                arrayList.Add(TakeawaysInfoBuf);
            }

            int Width = 0;
            int Height = 0;
            for (int i=0;i<arrayList.Count;i++) 
            {
                if(( i!= 0) && ((i % row)==0))
                {
                    column++;//列數計算
                }
                
                ((TakeawaysInfo)arrayList[i]).Location = new Point(w*((i%row)+1) +((i % row) * ((TakeawaysInfo)arrayList[i]).Size.Width), h*(column+1) +(column* ((TakeawaysInfo)arrayList[i]).Size.Height));//計算個元件的定位點
                panel1.Controls.Add((TakeawaysInfo)arrayList[i]);

                Width = w * ((i % row) + 1) + ((i % row) * ((TakeawaysInfo)arrayList[i]).Size.Width) + ((TakeawaysInfo)arrayList[i]).Size.Width;
                Height = h * (column + 1) + (column * ((TakeawaysInfo)arrayList[i]).Size.Height) + ((TakeawaysInfo)arrayList[i]).Size.Height;
            }
            panel1.AutoScrollMinSize = new System.Drawing.Size(Width, Height);//觸發長出Scroll Bar
        }