C#--GDI+ 的笔刷

笔刷用Pen类表示，使用Pen后，必须释放资源。如下例

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);

    Pen p = new Pen(Color.Black);
    g.DrawLine(p, 0, 0, 100, 100);
    p.Dispose();
}

可以设置Pen的线宽和对齐方式

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);

    Pen p = new Pen(Color.Black,3);
    p.Alignment=.PenAlignment.Center;
    g.DrawRectangle(p,3,3,8,7);
    p.Dispose();
}

设置画笔的点划线属性用DashStyle属性

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);

    Pen p = new Pen(Color.Black,2);
    p.DashStyle = DashStyle.Dash;
    g.DrawLine(p, 3, 3, 100, 3);
    p.Dispose();
}