Source

指向源对象的引用（提供数据的对象）——编写代码，或者从静态资源获取

RelativeSoerce

根据相对于目标对象的关系，指向源对象。

将一个元素绑定到自身或者父元素。

DataContext

大量元素绑定到同一个对象。

在上层对象中，使用DataContext属性。 上几层无所谓。

<Window x:Class="Demo.WPFLearning.Bindingg.BindNoElementObjects"
        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:Demo.WPFLearning.Bindingg"
        mc:Ignorable="d"
        Title="BindNoElementObjects" Height="350" Width="400">
    <Window.Resources>
        <FontFamily x:Key="CustomFont1"> Calibri</FontFamily>
        <FontFamily x:Key="CustomFont2">Seria</FontFamily>
    </Window.Resources>
    <Grid>
        <StackPanel Margin="3" Name="StackPanel" DataContext="{x:Static SystemFonts.IconFontFamily}">
            <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily},Path=Source}" Margin="3"/>
            <TextBlock Text="{Binding Source={StaticResource CustomFont1},Path=Source}" Margin="3"/>

            <TextBlock  >
                <TextBlock.Text>
                    <Binding Path="Name">
                        <Binding.RelativeSource>
                            <RelativeSource Mode="FindAncestor" AncestorType="{x:Type StackPanel}" AncestorLevel="1"/>
                        </Binding.RelativeSource>
                    </Binding>
                </TextBlock.Text>
            </TextBlock>

            <TextBlock Margin="5" Text="{Binding Path=Title,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}"/>

            <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily},Path=Source}" Margin="3"/>
            <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily},Path=LineSpacing}" Margin="3"/>
            <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily},Path=FamilyTypefaces[0].Style}" Margin="3"/>
            <!--在上层设置dataContext 属性后，不需要再重新设置Source了，-->
            <TextBlock Text="{Binding Path=Source}" Margin="3"/>
            <TextBlock Text="{Binding Path=LineSpacing}" Margin="3"/>
            <TextBlock Text="{Binding Path=FamilyTypefaces[0].Style}" Margin="3"/>

        </StackPanel>
    </Grid>
</Window>