复制 <Window xmlns="https://github.com/avaloniaui"
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"
mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
x:Class="AvaloniaAppTemplate.MainWindow"
Title="CheckBox sample">
<StackPanel>
<CheckBox>Not checked by default</CheckBox>
<CheckBox IsChecked="True">Checked by default</CheckBox>
</StackPanel>
</Window>
复制 <Window xmlns="https://github.com/avaloniaui"
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"
mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
x:Class="AvaloniaAppTemplate.MainWindow"
Title="CheckBox sample">
<StackPanel>
<CheckBox IsThreeState="True" IsChecked="False">Not checked by default</CheckBox>
<CheckBox IsThreeState="True" IsChecked="True">Checked by default</CheckBox>
<CheckBox IsThreeState="True" IsChecked="{x:Null}">Indeterminate by default</CheckBox>
</StackPanel>
</Window>