Dessin effacé par un form avec la class Graphics

Réponse acceptée !

public

partial class Form1 : Form

{

private LineCollection myLineCollection;

public Form1()

{

#region

InitializeComponent

this .pictureHardware = new System.Windows.Forms. PictureBox ();

((System.ComponentModel.

ISupportInitialize )( this .pictureHardware)).BeginInit();

this .SuspendLayout();

//

// pictureHardware

//

this .pictureHardware.Dock = System.Windows.Forms. DockStyle .Fill;

this .pictureHardware.Location = new System.Drawing. Point (0, 0);

this .pictureHardware.Name = "pictureHardware" ;

this .pictureHardware.Size = new System.Drawing. Size (292, 273);

this .pictureHardware.TabIndex = 0;

this .pictureHardware.TabStop = false ;

this .pictureHardware.Paint += new System.Windows.Forms. PaintEventHandler ( this .pictureHardware_Paint);

//

// Form1

//

this .AutoScaleDimensions = new System.Drawing. SizeF (6F, 13F);

this .AutoScaleMode = System.Windows.Forms. AutoScaleMode .Font;

this .ClientSize = new System.Drawing. Size (292, 273);

this .Controls.Add( this .pictureHardware);

this .Name = "Form1" ;

this .Text = "Form1" ;

this .Load += new System. EventHandler ( this .Form1_Load);

((System.ComponentModel.

ISupportInitialize )( this .pictureHardware)).EndInit();

this .ResumeLayout( false );

#endregion

this .myLineCollection = new LineCollection ();

}

private void pictureHardware_Paint( object sender, PaintEventArgs e)

{

Pen myPen = new Pen ( new SolidBrush ( Color .Red));

foreach ( Line l in this .myLineCollection)

e.Graphics.DrawLine(myPen, l.StartX, l.StartY, l.StopX, l.StopY);

}

private void Form1_Load( object sender, EventArgs e)

{

this .myLineCollection.Add( new Line (10, 10, 20, 20));

this .myLineCollection.Add( new Line (10, 60, 20, 70));

this .myLineCollection.Add( new Line (10, 110, 20, 120));

this .myLineCollection.Add( new Line (10, 160, 20, 170));

}

}

public class LineCollection : List < Line >

{

}

public class Line

{

private int startX;

public int StartX

{

get { return startX; }

set { startX = value ; }

}

private int startY;

public int StartY

{

get { return startY; }

set { startY = value ; }

}

private int stopX;

public int StopX

{

get { return stopX; }

set { stopX = value ; }

}

private int stopY;

public int StopY

{

get { return stopY; }

set { stopY = value ; }

}

public Line( int startX, int startY, int stopX, int stopY)

{

this .startX = startX;

this .startY = startY;

this .stopX = stopX;

this .stopY = stopY;

}

}