如何比较if((sender作为Grid).背景== new SolidColorBrush(Colors.Green)

如何比较if((sender as Grid)。Background== new SolidColorBrush(Colors.Green)) in wpf
网格是动态的

下面是代码

private void Grid_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.LeftButton == MouseButtonState.Pressed)
        {
            System.Windows.Media.Brush newColor = System.Windows.Media.Brushes.Yellow;
            // SolidColorBrush newBrush = (SolidColorBrush)newColor;
            //   //  System.Drawing.Brush b = new System.Drawing.SolidBrush((System.Drawing.Color)new System.Drawing.ColorConverter().ConvertFromString(new System.Windows.Media.BrushConverter().ConvertToString(Colors.Yellow)));
            //// System.Windows.Media.Color imageColor =( System.Windows.Media.Color) newBrush;
            string co = null;
            if((sender as Grid).Background== new SolidColorBrush(Colors.Green))
                co = "Audited";
            else if((sender as Grid).Background== new SolidColorBrush(Colors.Red))
                co = "DoNotAudit";
            else if((sender as Grid).Background== new SolidColorBrush(Colors.Orange))
                co = "ReAudit";
            else if((sender as Grid).Background== new SolidColorBrush(Colors.Yellow))
                co = "TobeAudited";
            MessageBox.Show(co);
        }

    }

co显示空值

var grid = sender as Grid;
if(grid != null)
{
  var background = grid.Background as SolidColorBrush;
  if(background != null)
  {
    var color = background.Color;
    if(Colors.Green.Equals(color))
    {
       co = "Audited";
    }
    else if(Colors.Red.Equals(color))
    {
      co = "DoNotAudit";
    }
    else if(Colors.Orange.Equals(color))
    {
      co = "ReAudit";
    }
    else if(Colors.Yellow.Equals(color))
    {
      co = "TobeAudited";
    }
  }
}