我正在尝试将DocumentViewer的语言从默认英语更改为德语，但没有成功。
作为WPF的新手，我真的很难做到这一点。
重要: DocumentViewer是在后面的代码中创建的，以响应菜单项的单击，然后将其添加为主窗口的Content。
我尝试执行以下操作，但似乎无能为力:
myDocumentViewer.Language = System.Windows.Markup.XmlLanguage.GetLanguage("de-DE");
没有进行任何更改，
DocumentViewer保留英语。谷歌搜索
Language属性的正确用法，我发现没有任何用处。问题:
如何将
DocumentViewer(使用代码创建)的语言设置为德语？ 最佳答案
您可以尝试完成的任务可以完成，但并不容易。
首先，我要指出您的测试机器需要安装适当的语言资源，以允许DocumentViewer用德语显示工具提示等。实际上，这意味着您需要在计算机上安装德语(德国)语言包。有关详细信息，请参见Language Packs。
据我所知，下面是我所知道的:
据我所知，WPF并没有内置的基础架构来动态适应Thread.CurrentThread.CurrentUILanguage或xml:lang的更改(等同于 FrameworkElement.Language 属性)。
WPF控件主要利用xml:lang来确定其UI语言(假设相应的UI资源可用)，并且如果需要，应用程序开发人员可以将其与Thread.CurrentThread.CurrentUILanguage Hook 。像这样，使用数据绑定(bind)本身并不难做到:
<DocumentViewer Language="{Binding UILanguage, ConverterCulture={x:Static glob:CultureInfo.InvariantCulture}}" />
这仍然并不意味着由此绑定(bind)数据的控件将使其UI语言适应
Thread.CurrentThread.CurrentUILanguage的更改。每次需要更改UI语言时，都需要重新创建控件，从可视树中删除旧控件，然后添加新控件。大致来说，代码看起来像这样:private void ChangeCulture()
{
string ietfLanguageTag = "de-DE";
var cultureInfo = CultureInfo.GetCultureInfo(ietfLanguageTag);
Thread.CurrentThread.CurrentCulture = cultureInfo;
Thread.CurrentThread.CurrentUICulture = cultureInfo;
UILanguage = ietfLanguageTag;
var parent = VisualTreeHelper.GetParent(_documentViewer) as Grid;
int index = parent.Children.IndexOf(_documentViewer);
parent.Children.Remove(_documentViewer);
_documentViewer = new DocumentViewer();
parent.Children.Add(_documentViewer);
}
上面的代码段假定
DocumentViewer的可视父级是Grid，并且由变量_documentViewer支持。通常，以上解决方案过于简单，不适用于MVVM场景(在WPF应用程序中通常是这种情况)。您可能具有到
DocumentViewer实例的数据绑定(bind)，并且创建新实例将需要在代码中重新创建那些绑定(bind)(另一方面，如果碰巧不涉及数据绑定(bind)，并且所有设置都在代码中设置，则我认为上述方法会奏效)。您可以通过创建一个简单的用户控件来进一步改善这一点，该控件封装了
DocumentViewer以及您可能希望保留的任何有趣的绑定(bind)。您的控件如下所示:XAML:
<UserControl x:Class="LocalizedDocumentViewer.CultureAwareDocumentViewer"
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:glob="clr-namespace:System.Globalization;assembly=mscorlib"
xmlns:local="clr-namespace:LocalizedDocumentViewer"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
d:DesignHeight="300"
d:DesignWidth="300"
mc:Ignorable="d">
<Grid>
<DocumentViewer DataContext="{Binding}" Language="{Binding UILanguage, ConverterCulture={x:Static glob:CultureInfo.InvariantCulture}}" />
</Grid>
XAML.cs
using System.Windows.Controls;
namespace LocalizedDocumentViewer
{
public partial class CultureAwareDocumentViewer : UserControl
{
public CultureAwareDocumentViewer()
{
InitializeComponent();
}
}
}
现在，您可以轻松地将其包含在主应用程序UI中，如下所示。下面的XAML包括几个其他UI元素(按钮和标签)，它们将有助于显示完整的示例:
MainWindow XAML:
<Window x:Class="DocViewerLoc.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:local="clr-namespace:DocViewerLoc"
xmlns:localizedDocumentViewer="clr-namespace:LocalizedDocumentViewer;assembly=LocalizedDocumentViewer"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title="DocumentViewer Culture Change Demo"
Width="525"
Height="350"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
mc:Ignorable="d">
<Grid>
<!-- Row and Column Definitions -->
<!-- Define a small row on the top of the window to place buttons -->
<Grid.RowDefinitions>
<RowDefinition Height="25" />
<RowDefinition Height="1*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<!-- Controls -->
<Button Grid.Row="0"
Grid.Column="0"
Command="{Binding CultureChanger}"
CommandParameter="{Binding RelativeSource={RelativeSource Self},
Path=Content}">
en-us
</Button>
<Button Grid.Row="0"
Grid.Column="1"
Command="{Binding CultureChanger}"
CommandParameter="{Binding RelativeSource={RelativeSource Self},
Path=Content}">
de-DE
</Button>
<Label Grid.Row="0" Grid.Column="2"><-- Click on one of these buttons to change UI culture</Label>
<Grid Grid.Row="1" Grid.ColumnSpan="3">
<localizedDocumentViewer:CultureAwareDocumentViewer x:Name="_documentViewer" DataContext="{Binding}" />
</Grid>
</Grid>
后面的相应代码具有几个依赖项属性，这些属性用于帮助与上述XAML中的绑定(bind)进行通信。
MainWindow.xaml.cs
using System;
using System.Globalization;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
namespace DocViewerLoc
{
public partial class MainWindow : Window
{
public MainWindow()
{
CultureChanger = new SimpleCommand(ChangeCulture);
InitializeComponent();
}
/// <summary>
/// ChangeCulture is called when one of the buttons with caption
/// 'en-us' or 'de-DE' is pressed.
/// </summary>
/// <param name="parameter">
/// A string containing the caption 'en-us' or 'de-DE'.
/// </param>
private void ChangeCulture(object parameter)
{
string ietfLanguageTag = parameter as string;
if (ietfLanguageTag == null) return;
var cultureInfo = CultureInfo.GetCultureInfo(ietfLanguageTag);
Thread.CurrentThread.CurrentCulture = cultureInfo;
Thread.CurrentThread.CurrentUICulture = cultureInfo;
// This will ensure that CultureAwareDocumentViewer's Language property
// binds to the updated value set here when it is instantiated next.
UILanguage = ietfLanguageTag;
// Remove the old instance of _documentViewer from the UI.
var parent = VisualTreeHelper.GetParent(_documentViewer) as Grid;
int index = parent.Children.IndexOf(_documentViewer);
parent.Children.Remove(_documentViewer);
// Create a new instance of CultureAwareDocumentViewer. This will
// use the updated value of UILanguage bind it to its Language (xml:lang)
// property, thus resulting in the appropriate language resources being
// loaded.
_documentViewer = new LocalizedDocumentViewer.CultureAwareDocumentViewer();
// Now, add the _documentViewer instance back to the UI tree.
parent.Children.Add(_documentViewer);
}
/// <summary>
/// ICommand used to bind to en-us and de-DE buttons in the UI
/// </summary>
#region CultureChange
public SimpleCommand CultureChanger
{
get { return (SimpleCommand)GetValue(CultureChangerProperty); }
set { SetValue(CultureChangerProperty, value); }
}
// Using a DependencyProperty as the backing store for CultureChanger. This enables animation, styling, binding, etc...
public static readonly DependencyProperty CultureChangerProperty =
DependencyProperty.Register("CultureChanger", typeof(SimpleCommand), typeof(MainWindow), new PropertyMetadata(default(SimpleCommand)));
#endregion
/// <summary>
/// UILanguage property used to bind to the FrameworkElement.Language (xml:lang) property
/// in the DocumentViewer object within the CultureAwareDocumentViewer control.
/// </summary>
#region UILanguage
public string UILanguage
{
get { return (string)GetValue(UILanguageProperty); }
set { SetValue(UILanguageProperty, value); }
}
// Using a DependencyProperty as the backing store for UILanguage. This enables animation, styling, binding, etc...
public static readonly DependencyProperty UILanguageProperty =
DependencyProperty.Register("UILanguage", typeof(string), typeof(MainWindow), new PropertyMetadata(Thread.CurrentThread.CurrentUICulture.IetfLanguageTag));
#endregion
}
/// <summary>
/// Simple implementation of the ICommand interface that delegates
/// Execute() to an Action<object>.
/// </summary>
public class SimpleCommand : ICommand
{
#pragma warning disable 67
public event EventHandler CanExecuteChanged;
#pragma warning restore 67
public SimpleCommand(Action<object> handler)
{
_handler = handler;
}
public bool CanExecute(object parameter)
{
return true;
}
public void Execute(object parameter)
{
_handler?.Invoke(parameter);
}
private Action<object> _handler;
}
}
下面的屏幕截图显示了生成的应用程序UI。请注意，
DocumentViewer中的资源将在英语和德语之间切换，但是UI的其余部分不会切换(因为我们没有尝试本地化我们的应用程序!)。在
DocumentViewer中显示en-us资源的应用程序:在
DocumentViewer中显示de-DE资源的应用程序: