private void button1_Click(object sender, RoutedEventArgs e)
        {
            SolidColorBrush myBrush = new SolidColorBrush(Colors.Green);
            this.rectangle1.Fill = myBrush;
        }

------解决方案--------------------

        private void button1_Click(object sender, RoutedEventArgs e)
       {
           if (this.isClicked == false)
           {
               this.button1.IsEnabled = false;
           }
           else
           {
               this.isClicked = false;
               this.rectangle1.Style = (Style)this.FindResource("rect1Style");
               this.button1.IsEnabled = false;
           }
       }
自己写个rect1Style