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PaintEventArgs Class

Provides data for the Paint event.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
public class PaintEventArgs : EventArgs, 
	IDisposable

The Paint event occurs when a control is redrawn. A PaintEventArgs specifies the Graphics to use to paint the control and the ClipRectangle in which to paint.

For information about the event model, see Events and Delegates.

The following example demonstrates handling the Paint event and using the PaintEventArgs class to draw rectangles on the form. The MouseDown and MouseUp events are handled to determine the size of the rectangle. The example also demonstrates the Invalidate method to invalidate the area of the rectangle, causing it to be redrawn.

		private Rectangle RcDraw;
		private float PenWidth = 5;

		private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{

			// Determine the initial rectangle coordinates...

			RcDraw.X = e.X;
			RcDraw.Y = e.Y;
		
		}

		private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{

			// Determine the width and height of the rectangle... 

			if(e.X < RcDraw.X)
			{
				RcDraw.Width = RcDraw.X - e.X;
				RcDraw.X = e.X;
			}
			else
			{
				RcDraw.Width = e.X - RcDraw.X;
			}

			if(e.Y < RcDraw.Y)
			{
				RcDraw.Height = RcDraw.Y - e.Y;
				RcDraw.Y = e.Y;
			}
			else
			{
				RcDraw.Height = e.Y - RcDraw.Y;
			}

			// Force a repaint of the region occupied by the rectangle... 

			this.Invalidate(RcDraw);
		
		}

		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{

			// Draw the rectangle...

			e.Graphics.DrawRectangle(new Pen(Color.Blue, PenWidth), RcDraw);
			
		}
// This example creates a PictureBox control on the form and draws to it. 
// This example assumes that the Form_Load event handler method is 
// connected to the Load event of the form. 

private PictureBox pictureBox1 = new PictureBox();
private void Form1_Load(object sender, System.EventArgs e)
{
    // Dock the PictureBox to the form and set its background to white.
    pictureBox1.Dock = DockStyle.Fill;
    pictureBox1.BackColor = Color.White;
    // Connect the Paint event of the PictureBox to the event handler method.
    pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);

    // Add the PictureBox control to the Form. 
    this.Controls.Add(pictureBox1);
}

private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
    // Create a local version of the graphics object for the PictureBox.
    Graphics g = e.Graphics;

    // Draw a string on the PictureBox.
    g.DrawString("This is a diagonal line drawn on the control",
        new Font("Arial",10), System.Drawing.Brushes.Blue, new Point(30,30));
    // Draw a line in the PictureBox.
    g.DrawLine(System.Drawing.Pens.Red, pictureBox1.Left, pictureBox1.Top,
        pictureBox1.Right, pictureBox1.Bottom);
}
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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