1001 نکته در سی شارپ

[sinpin]

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Runtime.InteropServices;

[DllImport("user32")]

internal static extern IntPtr GetDC(IntPtr hwnd);



[DllImport("User32.dll")]

internal static extern void ReleaseDC(IntPtr dc);



public void PaintRectangleToScreen()

{

    IntPtr deskDC = GetDC(IntPtr.Zero);

    Graphics g = Graphics.FromHdc(deskDC);

    Font font = new Font("Arial Black", 36);                

    DrawStringOnCenter(g, "Sale 1387 mobarak!", font, new Point(0, -25));

    font = new Font("Arial Black", 18);

    DrawStringOnCenter(g, "by: Sinpin", font, new Point(0, 25));

    Rectangle rect = new Rectangle(200, 300,

        Screen.PrimaryScreen.Bounds.Width - 400,

        Screen.PrimaryScreen.Bounds.Height - 600);

    g.FillRectangle(new SolidBrush(Color.FromArgb(100, Color.DodgerBlue))

    , rect);

    g.DrawRectangle(new Pen(Color.DodgerBlue, 3), rect);

    g.Dispose();

    ReleaseDC(deskDC);

}



private void DrawStringOnCenter(Graphics g, string str, Font font, Point offset)

{

    SizeF size = g.MeasureString(str, font);

    g.DrawString(str, font, Brushes.White,

      new PointF(

        (Screen.PrimaryScreen.Bounds.Width - size.Width) / 2 + offset.X,

        (Screen.PrimaryScreen.Bounds.Height - size.Height) / 2 + offset.Y)

        );

}

و مثالی از طریقه ی استفاده :

private void Form1_Load(object sender, EventArgs e)

{

    PaintRectangleToScreen();

    this.Close();

}

این یک مثال خیلی ساده از ترسیم مستقیم بر دسکتاپ بود.
و این یک مثال واقعی تر : http://www.codeproject.com/KB/applications/pcalgen.aspx