用户控件代码：
<UserControl xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
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"
mc:Ignorable="d" x:Class="UserControls.ucNewFactory" Loaded="UserControl_Loaded">
<controls:TabControl x:Name="tcMain">
<controls:TabItem x:Name="tiNewFactory">
<Grid>
<StackPanel Grid.Row="1">
<TextBox Name="tbFactoryCode" Text="{Binding FactoryCode, Mode=Twoway}" />
</StackPanel>
</Grid>
</controls:TabItem>
</controls:TabControl>
</UserControl>
后台代码：
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
Base_Factory factory = new Base_Factory();
factory.FactoryCode = "Factory";
tiNewFactory.DataContext = factory;
}
在MainPage中直接调用<controls:ucNewFactory/>时可以正常的对factory的值显示与更新，
但是使用Frame控件<navigation:Frame Name="navFrame"/>，在页面后台代码导航
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
//navFrame.Navigate(new Uri("/UserControls/ucNewFactory.xaml", UriKind.Relative));
navFrame.Source = (new Uri("/UserControls/ucNewFactory.xaml", UriKind.Relative));
}
}
用以上两种方式导航在页面上都不显示factory的值，修改tbFactoryCode的值对数据源也不会更新。。。
<TextBox Name="tbFactoryCode" Text="{Binding FactoryCode, Mode=Twoway}" />
奇怪的是这里的Text命名已经绑定了FactoryCode，调试跟踪下发现tbFactoryCode.Text也确实变成了我输入的值，
但是tiNewFactory.DataContext里面的FactoryCode却仍然是最初的"Factory"没有更新。。。
使用<controls:ucNewFactory/>调用则没有任何问题tbFactoryCode.Text改变会更新tiNewFactory.DataContext。。。
