急求问题，绘图

xsff1024 2009-09-27 05:09:27

我用下面的代码在picturebox里画了一个表格，为什么不显示？
protected override void OnPaint(PaintEventArgs e)//picturebox的onPanit事件
{
Image img = new Bitmap(1320, 1000);
Graphics gra = Graphics.FromImage(img);
Pen pen = new Pen(Color.Red, 4);
gra.DrawRectangle(pen, 10, 10, 875, 810);
Pen pen2 = new Pen(Color.Red, 2);
gra.DrawLine(pen2, new Point(60, 10), new Point(60, 820));
pen2.Dispose();
for (int i = 0; i < 32; i++)
{
gra.DrawLine(Pens.Red, new Point(60 + 25 * (i + 1), 10), new Point(60 + 25 * (i + 1), 820));
}
for (int i = 0; i < 20; i++)
{
gra.DrawLine(Pens.Red, new Point(10, 25 * (i + 1) + 10), new Point(885, 25 * (i + 1) + 10));
}
pen.Dispose();
pen = new Pen(Color.Blue, 4);
gra.DrawRectangle(pen, 890, 10, 400, 810);
for (int i = 0; i < 16; i++)
{
gra.DrawLine(Pens.Blue, new Point(890 + 25 * (i + 1), 10), new Point(890 + 25 * (i + 1), 820));
}
for (int i = 0; i < 20; i++)
{
gra.DrawLine(Pens.Blue, new Point(890, 25 * (i + 1) + 10), new Point(1290, 25 * (i + 1) + 10));
}
Graphics graf = e.Graphics;
graf.DrawImage(img, new Point(0, 0));
img.Dispose();
pen.Dispose();
gra.Dispose();
graf.Dispose();
}

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morecash 2009-09-27

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graf.Dispose(); 释放的位置可能部队

特别 2009-09-27

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另外，你可以直接使用e.Graphics进行绘图，没必要先生成Image
下面是整理一下的代码



            Graphics gra = e.Graphics;

            Pen pen = new Pen( Color.Red, 4 );

            gra.DrawRectangle( pen, 10, 10, 875, 810 );

            pen = new Pen( Color.Red, 2 );

            gra.DrawLine( pen, new Point( 60, 10 ), new Point( 60, 820 ) );

            //pen2.Dispose();

            for ( int i = 0; i < 32; i++ )

            {

                gra.DrawLine( Pens.Red, new Point( 60 + 25 * ( i + 1 ), 10 ), new Point( 60 + 25 * ( i + 1 ), 820 ) );

            }

            for ( int i = 0; i < 20; i++ )

            {

                gra.DrawLine( Pens.Red, new Point( 10, 25 * ( i + 1 ) + 10 ), new Point( 885, 25 * ( i + 1 ) + 10 ) );

            }

            //pen.Dispose();

            pen = new Pen( Color.Blue, 4 );

            gra.DrawRectangle( pen, 890, 10, 400, 810 );

            for ( int i = 0; i < 16; i++ )

            {

                gra.DrawLine( Pens.Blue, new Point( 890 + 25 * ( i + 1 ), 10 ), new Point( 890 + 25 * ( i + 1 ), 820 ) );

            }

            for ( int i = 0; i < 20; i++ )

            {

                gra.DrawLine( Pens.Blue, new Point( 890, 25 * ( i + 1 ) + 10 ), new Point( 1290, 25 * ( i + 1 ) + 10 ) );

            }

            //Graphics graf = e.Graphics;

            //graf.DrawImage( img, new Point( 0, 0 ) );

            //img.Dispose();

            //pen.Dispose();

            //gra.Dispose();

            //graf.Dispose();