progress bar 색 변경

using System;
using System.Windows.Forms;
using System.Drawing;

public class ProgressBarEx : ProgressBar
{
    private SolidBrush brush = null;

    public ProgressBarEx()
    {
        this.SetStyle(ControlStyles.UserPaint, true);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        if (brush == null || brush.Color != this.ForeColor)
            brush = new SolidBrush(this.ForeColor);

        Rectangle rec = new Rectangle(0, 0, this.Width, this.Height);
        if (ProgressBarRenderer.IsSupported)
            ProgressBarRenderer.DrawHorizontalBar(e.Graphics, rec);
        rec.Width = (int)(rec.Width * ((double)Value / Maximum)) - 4;
        rec.Height = rec.Height - 4;
        e.Graphics.FillRectangle(brush, 2, 2, rec.Width, rec.Height);
    }
}

progressbar를 상속받는 새로운 class 를 하나 만들어주고
progressbar 처럼 그냥 사용하면 된다.
마지막에 controls.add 해주면 바뀐걸 볼 수 있다.