WPF的5种绑定模式

1. OneWay（源变就更新目标属性）
2. TwoWay（源变就更新目标并且目标变就更新源）
3. OneTime（只根据源来设置目标，以后都不会变）
4. OneWayToSource（与OneWay相反）
5. Default（可以单向或双向，是靠被值定的源或目标是否有get或set来指定的）

演示效果

XAML

<Window x:Class="WPF_CH07_Demo01.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:WPF_CH07_Demo01"
        mc:Ignorable="d"
        Name="MainWindow1"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <Slider Name="sb1" Minimum="0" Maximum="100" Value="50" Width="300" Height=" 30" SmallChange="1"/>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="300"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>

            <Label Grid.Row="0" Grid.Column="0" Content="OneWay"/>
            <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding ElementName=sb1,Path=Value,Mode=OneWay}"/>

            <Label Grid.Row="1" Grid.Column="0" Content="OneWayToSource"/>
            <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding ElementName=sb1,Path=Value,Mode=OneWayToSource}"/>

            <Label Grid.Row="2" Grid.Column="0" Content="TwoWay"/>
            <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding ElementName=sb1,Path=Value,Mode=TwoWay}"/>

            <Label Grid.Row="3" Grid.Column="0" Content="OneTime"/>
            <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding ElementName=sb1,Path=Value,Mode=OneTime}"/>
        </Grid>
    </StackPanel>
</Window>