asp.net中WPF自訂富文本顯示控制項

RichTextBox比較的強大，支援富文本和簡單文本等，可以實現出類似Word的那樣的效果。

今天自訂一個支援富文本顯示的RichTextBox控制項。

代碼如下

複製代碼

XAML代碼： <UserControl x:Class="Kaitone.DetectiveHelper.UI.Controls.RichTextBox.RichboxTextShow"      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"      mc:Ignorable="d"      d:DesignHeight="300" d:DesignWidth="300">     <Grid> <RichTextBox Name="mainRTB" AcceptsReturn="True" IsReadOnly="True"      BorderBrush="Transparent" BorderThickness="0" Background="Transparent"      HorizontalAlignment="Stretch" VerticalAlignment="Stretch"      VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">      </RichTextBox>     </Grid> </UserControl>

後台代碼：

代碼如下

複製代碼

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes;   namespace Kaitone.DetectiveHelper.UI.Controls.RichTextBox {     /// <summary>     /// RichboxTextShow.xaml 的互動邏輯     /// </summary>     public partial class RichboxTextShow : UserControl     { public static readonly DependencyProperty TextyProperty =     DependencyProperty.Register("Text",typeof(string),         typeof(RichboxTextShow),new PropertyMetadata(string.Empty,new PropertyChangedCallback(TextyPropertyChanged) )); private static void TextyPropertyChanged(DependencyObject sender,DependencyPropertyChangedEventArgs args) {     RichboxTextShow editer = new RichboxTextShow();    } public string Text {     get { return ConvertToRtfString(this.mainRTB); }     set { if (!String.IsNullOrEmpty(value)) {     LoadFromRtfString(value,this.mainRTB); } else {     this.mainRTB.Document.Blocks.Clear(); }     } } private static void LoadFromRtfString(string rtf, System.Windows.Controls.RichTextBox richTextBox) {     if (string.IsNullOrEmpty(rtf))     { throw new ArgumentNullException();     }     TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);     using (MemoryStream ms = new MemoryStream())     { using (StreamWriter sw = new StreamWriter(ms)) {     sw.Write(rtf);     sw.Flush();     ms.Seek(0, SeekOrigin.Begin);     textRange.Load(ms, DataFormats.Rtf); }     }        } private static string ConvertToRtfString(System.Windows.Controls.RichTextBox rcb) {     string resultstring = string.Empty;     using (MemoryStream stream=new MemoryStream())     { TextRange documentTextRange = new TextRange(rcb.Document.ContentStart, rcb.Document.ContentEnd); string dataformt = DataFormats.Rtf; documentTextRange.Save(stream, dataformt); stream.Seek(0, SeekOrigin.Begin); using(StreamReader reader=new StreamReader(stream,Encoding.Default)){     resultstring = reader.ReadToEnd(); }       }     return resultstring; } public RichboxTextShow() {     InitializeComponent(); }     } }

說明：

1、相依性屬性聲明：可以通過控制項點出來的。

代碼如下	複製代碼
public static readonly DependencyProperty TextyProperty =     DependencyProperty.Register("Text",typeof(string),          typeof(RichboxTextShow),new PropertyMetadata(string.Empty,new PropertyChangedCallback(TextyPropertyChanged) ));

2、富文本和字串String之間的轉換：

代碼如下

複製代碼

private static void LoadFromRtfString(string rtf, System.Windows.Controls.RichTextBox richTextBox) {     if (string.IsNullOrEmpty(rtf))     { throw new ArgumentNullException();     }     TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);     using (MemoryStream ms = new MemoryStream())     { using (StreamWriter sw = new StreamWriter(ms)) {     sw.Write(rtf);     sw.Flush();     ms.Seek(0, SeekOrigin.Begin);     textRange.Load(ms, DataFormats.Rtf); }     } } private static string ConvertToRtfString(System.Windows.Controls.RichTextBox rcb) {     string resultstring = string.Empty;     using (MemoryStream stream=new MemoryStream())     { TextRange documentTextRange = new TextRange(rcb.Document.ContentStart, rcb.Document.ContentEnd); string dataformt = DataFormats.Rtf; documentTextRange.Save(stream, dataformt); stream.Seek(0, SeekOrigin.Begin); using(StreamReader reader=new StreamReader(stream,Encoding.Default)){     resultstring = reader.ReadToEnd(); }     }     return resultstring; }