XAML - RichEditBox

RichEditBox 是一种富文本编辑控件，支持格式化文本、超链接和其他富内容。WPF 项目不支持此控件。因此它将在 Windows 应用中实现。RichEditBox 类的层次继承如下：

属性

事件

方法

示例

以下示例演示如何在 RichEditBox 中打开和保存 RTF 文件。以下是创建和初始化两个按钮和一个具有某些属性和事件的 RichEditBox 的 XAML 代码。

<Page x:Class = "XAMLRichEditBox.MainPage" 
   xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
   xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" 
   xmlns:local = "using:XAMLRichEditBox" 
   xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" 
   xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006"
   mc:Ignorable = "d">
	
   <Grid Background = "{ThemeResource ApplicationPageBackgroundThemeBrush}"> 
      <Grid Margin = "120">
         <Grid.RowDefinitions> 
            <RowDefinition Height="50"/> 
            <RowDefinition/> 
         </Grid.RowDefinitions>
			
         <StackPanel Orientation = "Horizontal"> 
            <Button Content = "Open file" Click = "OpenButton_Click"/> 
            <Button Content = "Save file" Click = "SaveButton_Click"/> 
         </StackPanel>
			
         <RichEditBox x:Name = "editor" Grid.Row = "1"/> 
      </Grid>
   </Grid>
   
</Page>

以下是针对不同事件和文件处理的 C# 实现：

using System; 
using System.Collections.Generic; 
using System.IO; using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime; 

using Windows.Foundation; 
using Windows.Foundation.Collections;

using Windows.Storage; 
using Windows.Storage.Pickers; 
using Windows.Storage.Provider; 

using Windows.UI.ViewManagement; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Controls.Primitives; 
using Windows.UI.Xaml.Data; 
using Windows.UI.Xaml.Input; 
using Windows.UI.Xaml.Media; 
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at
http://go.microsoft.com/fwlink/?LinkId=234238

namespace XAMLRichEditBox {
   /// <summary> 
      /// An empty page that can be used on its own or navigated to within a Frame.
   /// </summary>
	
   public sealed partial class MainPage : Page {
      public MainPage() { 
         this.InitializeComponent(); 
      } 
      private async void OpenButton_Click(object sender, RoutedEventArgs e) {
         // Open a text file. 
         Windows.Storage.Pickers.FileOpenPicker open = new 
            Windows.Storage.Pickers.FileOpenPicker();
         open.SuggestedStartLocation = 
            Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
         open.FileTypeFilter.Add(".rtf");
         Windows.Storage.StorageFile file = await open.PickSingleFileAsync();

         if (file != null) { 
            Windows.Storage.Streams.IRandomAccessStream randAccStream = await 
               file.OpenAsync(Windows.Storage.FileAccessMode.Read);

            // Load the file into the Document property of the RichEditBox.
            editor.Document.LoadFromStream(Windows.UI.Text.TextSetOptions.FormatRtf, randAccStream); 
         }
      }
      private async void SaveButton_Click(object sender, RoutedEventArgs e) {
         if (((ApplicationView.Value != ApplicationViewState.Snapped) || 
            ApplicationView.TryUnsnap())) { 
            
            FileSavePicker savePicker = new FileSavePicker(); 
            savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
						
            // Dropdown of file types the user can save the file as
            savePicker.FileTypeChoices.Add("Rich Text", new List <string>() { ".rtf" });
							
            // Default file name if the user does not type one in or select a file to replace
            savePicker.SuggestedFileName = "New Document";
							
            StorageFile file = await savePicker.PickSaveFileAsync();
						
            if (file != null) { 
               // Prevent updates to the remote version of the file until we 
               //finish making changes and call 
               CompleteUpdatesAsync. CachedFileManager.DeferUpdates(file);

               // write to file
               Windows.Storage.Streams.IRandomAccessStream randAccStream = await 
                  file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
							
               editor.Document.SaveToStream(Windows.UI.Text.TextGetOptions.FormatRtf, randAccStream);

               // Let Windows know that we're finished changing the file so the 
               // other app can update the remote version of the file.
								
               FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
								
               if (status != FileUpdateStatus.Complete) { 
                  Windows.UI.Popups.MessageDialog
                     errorBox = new Windows.UI.Popups.MessageDialog(
                     "File " + file.Name + " couldn't be saved."); 
                  
                  await errorBox.ShowAsync(); 
               } 
            }
         } 
      } 
   } 
}

编译并执行上述代码后，将产生以下输出。您可以使用此应用程序打开、编辑和保存任何 RTF 文件。

我们建议您执行上述示例代码并尝试其他一些属性和事件。