如何在Aero/.net4中获得块样式的progressbar

用这个

public class ContinuousProgressBar : ProgressBar 
{ 
    public ContinuousProgressBar() 
    { 
        this.Style = ProgressBarStyle.Continuous; 
    }
    protected override void CreateHandle()
    {
        base.CreateHandle();
        try
        {
            SetWindowTheme(this.Handle, "", "");
        }
        catch 
        { 
        }
    }

    [System.Runtime.InteropServices.DllImport("uxtheme.dll")]  
    private static extern int SetWindowTheme(IntPtr hwnd, string appname, string idlist);
}