标签:ora microsoft provider block ack dev ice width 等等
MarkupExtension 标记扩展。wpf中已实现了很多MarkupExtension。如binding,x:StaticResource等等。通过继承MarkupExtension,我们可以自定义标记。
public class ColorExtend : MarkupExtension { string _flag; public ColorExtend(string flag) { _flag = flag; } public override object ProvideValue(IServiceProvider serviceProvider) { switch(_flag) { case "G": return Brushes.Green; case "R": return Brushes.Red; default: return Brushes.Black; } } }
再ProvideValue中,根据xaml中传入的参数,返回转换后的对象。比如,我xaml中传入字符"G",通过自定义标记扩展,可以返回颜色Green对象。
xmal中使用:
<Window x:Class="MarkupExtensionTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:MarkupExtensionTest" mc:Ignorable="d" Title="MainWindow" Height="450" Width="800"> <Grid> <TextBlock Text="test111111" Foreground="{local:ColorExtend G}" /> <TextBlock Text="test111111" Foreground="{local:ColorExtend R}" Margin="10,106,625.6,257" /> <TextBlock Text="test111111" Foreground="{local:ColorExtend 111}" Margin="10,62,635.6,314" /> </Grid> </Window>
效果图:
标签:ora microsoft provider block ack dev ice width 等等
原文地址:https://www.cnblogs.com/czly/p/12752654.html