绑定元素的长宽(Canvas的子类自动伸展)
绑定元素的大小一般会想到Width和Height但是wpf里的Width和Height如果没有显示的设置过大小那么得到的就是NaN
要动态得到元素的大小要用ActualWidth、ActualHeight
<UserControl x:Class="园区展示程序.MyRichTextBox" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" Name="root"> <Canvas> <RichTextBox Height="{Binding ElementName=root, Path=ActualHeight}" Width="{Binding ElementName=root, Path=ActualWidth}" Name="content" IsReadOnly="True" Foreground="White" BorderBrush="{x:Null}" SelectionOpacity="0" BorderThickness="0" Background="{x:Null}"> </RichTextBox> <Label Height="{Binding ElementName=root, Path=ActualHeight}" Width="{Binding ElementName=root, Path=ActualWidth}" Opacity="0" /> </Canvas> </UserControl>