Code
//窗体变量
Size formSize = Size.Empty;
//纵横屏幕标志 动态更换图片用 默认纵向por 横向lan
string formSign = "por";
Graphics gxBuffer;
Bitmap offBitmap;
Font font = new Font("Tahoma", 10, FontStyle.Regular);
//手机程序路径
string path = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);

Code
 protected override void OnPaint(PaintEventArgs e)
        {
            if (offBitmap != null)
            {
                AdjustFormLayout();
                gxBuffer = Graphics.FromImage(offBitmap);
                gxBuffer.Clear(this.BackColor);
                this.BackColor = SystemColors.MenuText;

                //确认当前屏幕大小，获取对应的图片文件夹
                GetConfig getconfig=new GetConfig();
                ConfigClass config = getconfig.CheckScreenSize(formSize.Width.ToString(), formSize.Height.ToString());
                Program.ScreenFileName = config.FileName;

                AlphaImage bmp = AlphaImage.CreateFromFile(path + @"\" + Program.ScreenFileName + @"\bg.png");
                Rectangle imgRect = new Rectangle(0, 0, formSize.Width, formSize.Height);
                bmp.Draw(gxBuffer, imgRect);

                e.Graphics.DrawImage(offBitmap, 0, 0);
            }
            else
            {
                e.Graphics.Clear(this.BackColor);
            }
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);
            if (offBitmap != null)
                offBitmap.Dispose();

            offBitmap = new Bitmap(this.Width, this.Height, PixelFormat.Format32bppRgb);
        }

        /**//// <summary>
        /// 获取屏幕大小，展现模式
        /// </summary>
        public void AdjustFormLayout()
        {
            Rectangle screenBounds = Screen.PrimaryScreen.Bounds;
            float widthRatio = 0.0F;
            float heightRatio = 0.0F;

            DisplayManager.GetDisplayRatiosByDpi(this, ref widthRatio, ref heightRatio);

            控件按比例缩放#region 控件按比例缩放

            if (DisplayManager.GetDisplayMode() == DisplayMode.Portrait)
            {
                // 纵向
                formSize = new Size(screenBounds.Width, screenBounds.Height);
                formSign = "por";
                //viewCount = 9;
            }
            else if (DisplayManager.GetDisplayMode() == DisplayMode.Landscape)
            {
                // 横向
                formSize = new Size(screenBounds.Width, screenBounds.Height);
                formSign = "lan";
                //viewCount = 8;
            }
            else
            {
                // 正方
                formSize = new Size(screenBounds.Width, screenBounds.Height);
                formSign = "por";
                //viewCount = 9;
            }
            #endregion

        }

Code
//标题栏绘制
bmp = AlphaImage.CreateFromFile(path + @"\" + Program.ScreenFileName + @"\indexP_alphaBar.png");
imgRect = new Rectangle(0, 0, 320, 39);
bmp.Draw(gxBuffer, imgRect);
//标题图片绘制
bmp = AlphaImage.CreateFromFile(path + @"\" + Program.ScreenFileName + @"\indexPeople_04.png");
imgRect = new Rectangle(10, 10, 19, 22);
bmp.Draw(gxBuffer, imgRect);
//文字绘制
gxBuffer.DrawString("Hello Bright!", font, brush, 60, 10);

Brush brush;
public FrmIndex()
        {
            brush = new SolidBrush(Color.White);
            InitializeComponent();
        }