C# 双色ProgressBar

效果如图：

 

实现代码：

红色为FixValue 属性控制，绿色为Value控制。

代码：

public class NewProgressBar : ProgressBar
    {
        private int fixValue ;

        public int FixValue
        {
            get { return fixValue; }
            set
            {
                if (fixValue < Minimum)
                {
                    //MessageBox.Show("属性值设置必须大于等于最小值！");
                    fixValue = Minimum;
                    FixValue = Minimum;
                    return;
                }
                fixValue = value;
            }
        }

        public NewProgressBar()
        {
            
            //this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint |
                ControlStyles.AllPaintingInWmPaint, true);
            this.UpdateStyles();
        }

        protected override void OnPaint(PaintEventArgs e)
        {

            if (Value >= fixValue)
            {
                Rectangle rec = e.ClipRectangle;
                rec.Width = (int)(rec.Width * ((double)(Value-Minimum) / (Maximum - Minimum))) - 4;
                if (ProgressBarRenderer.IsSupported)
                    ProgressBarRenderer.DrawHorizontalBar(e.Graphics, e.ClipRectangle);
                rec.Height = rec.Height - 4;
                e.Graphics.FillRectangle(Brushes.Lime, 2, 2, rec.Width, rec.Height);
            }
            else
            {
                Rectangle rec = e.ClipRectangle;
                rec.Width = (int)(rec.Width * ((double)(fixValue-Minimum) / (Maximum - Minimum))) - 2;
                if (ProgressBarRenderer.IsSupported)
                    ProgressBarRenderer.DrawHorizontalBar(e.Graphics, e.ClipRectangle);
                rec.Height = rec.Height - 4;

                Rectangle recv = e.ClipRectangle;
                recv.Width = (int)(rec.Width * ((double)(Value - Minimum) / (fixValue - Minimum)));
                if (ProgressBarRenderer.IsSupported)
                    ProgressBarRenderer.DrawHorizontalBar(e.Graphics, e.ClipRectangle);
                recv.Height = recv.Height - 4;
                e.Graphics.FillRectangle(Brushes.Lime, 2, 2, recv.Width, recv.Height);
                e.Graphics.FillRectangle(Brushes.HotPink, recv.Width, 2, rec.Width - recv.Width, rec.Height);
            }

        }
    }