WPF 精修篇 动态资源

原文:WPF 精修篇 动态资源

动态资源 使用 DynamicResource 关键字

静态 就是 StaticResource

原则上是 能用静态就用静态 动态会让前台界面压力很大~

动态资源引用 就是可以在后台改变资源 显示不同的样式  资源是一样的 就看关键字用什么

效果

   <Window.Resources>





        <LinearGradientBrush x:Key="RectFill" EndPoint="0.5,1" StartPoint="0.5,0">





            <GradientStop Color="BurlyWood" Offset="0"/>





            <GradientStop Color="White" Offset="1"/>





        </LinearGradientBrush>





    </Window.Resources>





    <Grid>





        <Rectangle Fill="{ DynamicResource RectFill}" HorizontalAlignment="Left" Height="76" Margin="85,70,0,0" Stroke="Black" VerticalAlignment="Top" Width="243">





       





        </Rectangle>





        <RadioButton x:Name="R" Content="R" HorizontalAlignment="Left" Margin="377,70,0,0" VerticalAlignment="Top" Click="R_Click"/>





        <RadioButton x:Name="G" Content="G" HorizontalAlignment="Left" Margin="377,98,0,0" VerticalAlignment="Top" Click="G_Click"/>





        <RadioButton x:Name="B"  Content="B" HorizontalAlignment="Left" Margin="377,130,0,0" VerticalAlignment="Top" Click="B_Click"/>





 





    </Grid>

        private void R_Click(object sender, RoutedEventArgs e)





        {





            var bursh = Resources["RectFill"];





            if (bursh is LinearGradientBrush) 





            {





                LinearGradientBrush Ibursh = (LinearGradientBrush)bursh;





                Ibursh = new LinearGradientBrush()





                {





                    GradientStops = new GradientStopCollection() 





                    {





                        new  GradientStop(Colors.BurlyWood,0),





                        new GradientStop(Colors.Red,1)





 





                    }





                };





                Resources["RectFill"] = Ibursh;





            }





      





        }





 





        private void G_Click(object sender, RoutedEventArgs e)





        {





            var bursh = Resources["RectFill"];





            if (bursh is LinearGradientBrush)





            {





                LinearGradientBrush Ibursh = (LinearGradientBrush)bursh;





                Ibursh = new LinearGradientBrush()





                {





                    GradientStops = new GradientStopCollection() 





                    {





                        new  GradientStop(Colors.BurlyWood,0),





                        new GradientStop(Colors.Green,1)





 





                    }





                };





                Resources["RectFill"] = Ibursh;





            }





   





        }





 





        private void B_Click(object sender, RoutedEventArgs e)





        {





            var bursh = Resources["RectFill"];





            if (bursh is LinearGradientBrush)





            {





                LinearGradientBrush Ibursh = (LinearGradientBrush)bursh;





                Ibursh = new LinearGradientBrush()





                {





                    GradientStops = new GradientStopCollection() 





                    {





                        new  GradientStop(Colors.BurlyWood,0),





                        new GradientStop(Colors.Blue,1)





 





                    }





                };





                Resources["RectFill"] = Ibursh;





            }





      





        }