c# 改变Mdi窗体区背景样式

        /// <summary>
        /// 更改Mdi背景样式
        /// </summary>
        private void ChangeMidBackStyle()
        {
            //更改Mdi背景样式
            MdiClient mctMdi = new MdiClient();
            foreach (Control conMid in this.Controls)
            {
                //得到Mdi
                if (conMid.GetType().ToString() == "System.Windows.Forms.MdiClient")
                {
                    mctMdi = (System.Windows.Forms.MdiClient)conMid;
                    //改变背景颜色
                    mctMdi.BackColor = Color.FromArgb(238, 243, 250);
                    if (File.Exists("img/ContextMenu/Back.png"))
                    {
                        //改变背景图片排列
                        this.BackgroundImageLayout = ImageLayout.Center;
                        //改变背景图片
                        mctMdi.BackgroundImage = Image.FromFile(@"img\ContextMenu\Back.png");
                    }
                    break;
                }
            }
        }