WPF RichTextBox 使用示例

一、取出RichTextBox值

1、取得RichTextBox 文字

TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
string text = DataFormats.Text;

2、取得RichTextBox内的XAML文档

string xaml = System.Windows.Markup.XamlWriter.Save(richTextBox.Document);

3、将richTextBox的类容以二进制数据的方法取出
     FlowDocument document = richTextBox.Document;
     System.IO.Stream s = new System.IO.MemoryStream(); 
     System.Windows.Markup.XamlWriter.Save(document, s);         
     byte[] data = new byte[s.Length];
     s.Position = 0;
     s.Read(data, 0, data.Length);
      s.Close();

二、给RichTextBox赋值

String字符串赋值给RichTextBox

FlowDocument doc = new FlowDocument();
Paragraph p = new Paragraph(); // Paragraph 类似于 html 的 P 标签
Run r = new Run("文字"); // Run 是一个 Inline 的标签
p.Inlines.Add(r);
doc.Blocks.Add(p);
richTextBox.Document = doc;

以上可以简化为

richTextBox.Document = new FlowDocument(new Paragraph(new Run("文字")));

 

第一种方法：将XAML字符串转换为数据流赋值给richTextBox中 
  System.IO.StringReader sr = new System.IO.StringReader(xw);
  System.Xml.XmlReader xr = System.Xml.XmlReader.Create(sr);
  richTextBox1.Document = (FlowDocument)System.Windows.Markup.XamlReader.Load(xr);

第二种方法：将Text字符串转换为数据流赋值给richTextBox中 

using (StreamReader streamReader = File.OpenText(filename)) {
           Paragraph paragraph = new Paragraph();
           paragraph.Text = streamReader.ReadToEnd();
           richTextBox.Document.Blocks.Add(paragraph);
 }

第三种方法：将二进制数据赋值给richTextBox
   System.IO.Stream ss = new System.IO.MemoryStream(data);
    FlowDocument doc = System.Windows.Markup.XamlReader.Load(ss) as FlowDocument;
     ss.Close();
     richTextBox1.Document = doc;

三、清空RichTextBox的方法

System.Windows.Documents.FlowDocument doc = richTextBox.Document;
doc.Blocks.Clear();

 

四、复制, 剪切,粘贴,全选

方法一：将键击发送到应用程序的方法
richTextBox.Focus();
SendKeys.Send("^a");//全选
SendKeys.Send("^c");//复制
SendKeys.Send("^x");//剪切
SendKeys.Send("^v");//粘贴

方法二：直接通过命令操作

<RichTextBox Name="richTextBox" Height="200" IsEnabled="True">
<RichTextBox.ContextMenu>
<ContextMenu>
<MenuItem Header="复制" Command="ApplicationCommands.Copy" />
<MenuItem Header="粘贴" Command="ApplicationCommands.Paste" />
<MenuItem Header="剪切" Command="ApplicationCommands.Cut" />
</ContextMenu>
</RichTextBox.ContextMenu>
</RichTextBox>

五、RichTextBox增加XAML内容

<RichTextBox Name="richTextBox" Height="200" IsEnabled="True">
<FlowDocument>
<Paragraph>
<Bold>Bold</Bold>
<Italic>Italicize</Italic>
<Hyperlink>Hyperlink stuff</Hyperlink>
</Paragraph>
</FlowDocument>
</RichTextBox>

六、 RichTextBox 设置Style内容样式，如：缩短段间距

<RichTextBox Name="richTextBox" Height="200" IsEnabled="True">
<RichTextBox.Resources>
<Style TargetType="{x:Type Paragraph}">
<Setter Property="Margin" Value="0"/>
</Style>
</RichTextBox.Resources>
</RichTextBox>

七、RichTextBox插入图片，点击按钮选取图片

Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();
ofd.Filter = "Text Files (*.jpg; *.png; *.gif)|*.jpg;*.png;*.gif";
ofd.Multiselect = false;
if (ofd.ShowDialog() == true)
{
System.Windows.Controls.Image img = new System.Windows.Controls.Image();
BitmapImage bImg = new BitmapImage();
bImg.BeginInit();
//bImg.UriSource = new Uri(@"C:\Users\admin\source\repos\WPFRichTextBox\WPFRichTextBox\ext_apk.png", UriKind.Relative);
bImg.UriSource = new Uri(ofd.FileName, UriKind.RelativeOrAbsolute);
bImg.EndInit();
img.Source = bImg;
//调整图片大小
if (bImg.Height > 100 || bImg.Width > 100)
{
img.Height = bImg.Height * 0.2;
img.Width = bImg.Width * 0.2;
}
//图片缩放模式
//img.Stretch = Stretch.Uniform;
new InlineUIContainer(img, richTextBox.Selection.Start); //插入图片到选定位置
}

八、查找段落 Paragraph

var doc = this.richTextBox.Document;
var blocks = doc.Blocks.ToArray();
var paragraphs = blocks.Where(b => b is Paragraph).ToArray();
Paragraph paragraph = (Paragraph)paragraphs[0];

//修改段落内容
p.Inlines.Clear();
p.Inlines.Add(new Run("天涯共此时"));

九、查找FlowDocument中的所有图像

1、查找Paragraph中的所有图像

List<System.Windows.Controls.Image> FindAllImagesInParagraph(Paragraph paragraph)
{
List<System.Windows.Controls.Image> result = null;
foreach (var inline in paragraph.Inlines)
{
var inlineUIContainer = inline as InlineUIContainer;
if (inlineUIContainer != null)
{
var image = inlineUIContainer.Child as System.Windows.Controls.Image;
if (image != null)
{
if (result == null)
result = new List<System.Windows.Controls.Image>();
result.Add(image);
}
}
}
return result;
}

十、RichTextBox 启用 WPF 控件

默认情况下，RichTextBox 禁用处理 Button Click，ContextMenu 等

1、实现步骤，重写 FlowDocument

public class TalkFlowDocument : FlowDocument
{
    protected override bool IsEnabledCore
    {
        get
        {
            return true;
        }
    }
}

2、XAML 引用

<Window xmlns:local="clr-namespace:HitoolCore">
    <Grid>
        <RichTextBox IsReadOnly="True">
            <local:TalkFlowDocument>
                <Paragraph>
                    <TextBlock Text="你好"/>
                    <Paragraph.ContextMenu>
                        <ContextMenu>
                            <MenuItem Header="复制" />
                            <MenuItem Header="引用" />
                        </ContextMenu>
                    </Paragraph.ContextMenu>
                </Paragraph>
                <Paragraph>
                    <TextBlock Text="以后请多关照"/>
                    <Paragraph.ContextMenu>
                        <ContextMenu>
                            <MenuItem Header="撤回" />
                            <MenuItem Header="转发" />
                        </ContextMenu>
                    </Paragraph.ContextMenu>
                </Paragraph>
            </local:TalkFlowDocument>
        </RichTextBox>
    </Grid>
</Window>

　　

参考：http://www.voidcn.com/article/p-vrncotwa-bxx.html

 

WPF RichTextBox的使用总结

https://www.cnblogs.com/gaobing/p/3865254.html