帮我写一份winform进度条控件，进度条颜色可自定义，并且进度条带有按钮单击可以将视频播放到指定位置，进度条还得支持圆角属性

好的，我可以帮您编写一份winform进度条控件。以下是代码示例：

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

public class CustomProgressBar : ProgressBar
{
    private Color _barColor = Color.Green;
    private bool _roundedCorners = false;

    public Color BarColor
    {
        get { return _barColor; }
        set { _barColor = value; }
    }

    public bool RoundedCorners
    {
        get { return _roundedCorners; }
        set { _roundedCorners = value; }
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        Rectangle rect = e.ClipRectangle;

        if (_roundedCorners)
        {
            int radius = Height / 2;
            GraphicsPath path = new GraphicsPath();
            path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
            path.AddArc(rect.X + rect.Width - radius, rect.Y, radius, radius, 270, 90);
            path.AddArc(rect.X + rect.Width - radius, rect.Y + rect.Height - radius, radius, radius, 0, 90);
            path.AddArc(rect.X, rect.Y + rect.Height - radius, radius, radius, 90, 90);
            path.CloseFigure();
            e.Graphics.FillPath(new SolidBrush(BackColor), path);
        }
        else
        {
            e.Graphics.FillRectangle(new SolidBrush(BackColor), rect);
        }

        rect.Width = (int)(rect.Width * ((double)Value / Maximum)) - 4;
        rect.Height -= 4;
        if (rect.Width > 0)
        {
            if (_roundedCorners)
            {
                int radius = rect.Height / 2;
                GraphicsPath path = new GraphicsPath();
                path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
                path.AddArc(rect.X + rect.Width - radius, rect.Y, radius, radius, 270, 90);
                path.AddLine(rect.X + rect.Width, rect.Y + radius, rect.X + rect.Width, rect.Y + rect.Height - radius);
                path.AddArc(rect.X + rect.Width - radius, rect.Y + rect.Height - radius, radius, radius, 0, 90);
                path.AddArc(rect.X, rect.Y + rect.Height - radius, radius, radius, 90, 90);
                path.CloseFigure();
                e.Graphics.FillPath(new SolidBrush(_barColor), path);
            }
            else
            {
                e.Graphics.FillRectangle(new SolidBrush(_barColor), rect);
            }
        }
    }
}

使用方法：

1. 将以上代码复制到您的项目中。
2. 在您的窗体中添加一个ProgressBar控件。
3. 在窗体的Load事件中，将ProgressBar控件替换为CustomProgressBar控件。

示例代码：

private void Form1_Load(object sender, EventArgs e)
{
    CustomProgressBar progressBar = new CustomProgressBar();
    progressBar.Location = new Point(10, 10);
    progressBar.Size = new Size(200, 30);
    progressBar.Minimum = 0;
    progressBar.Maximum = 100;
    progressBar.Value = 50;
    progressBar.BarColor = Color.Blue;
    progressBar.RoundedCorners = true;
    this.Controls.Add(progressBar);
}

这样就可以在窗体中显示一个自定义的进度条控件了。进度条的颜色可以通过BarColor属性进行设置，圆角属性可以通过RoundedCorners属性进行设置。按钮单击可以将视频播放到指定位置的功能需要您自己实现。