RichTextBox的使用
WPF里面虽然很多形式上跟Winform一样，但是控件的使用上面还是会有很多诧异。RichTextBox就是一个例子，是的，在WPF里面对这个控件可以做很多Winform很难做的效果出来。
比如在对RichTextBox插入图片，winform时代除了用复制粘贴这种借助剪贴板的差劲方法之外就是要重写和自定义RichTextBox控件了。这就需要高超的编程能力了。但在WPF里面，只需要加几个代码就能搞定了。
在XAML里面添加图片到RichTextBox可以如下所示：
<RichTextBox HorizontalAlignment="Left" Margin="90,12,0,0" Name="richTextBox1">
<RichTextBox.Document>
<FlowDocument Focusable="True" LineHeight="5">
<Paragraph x:Name="gara">
文字区域
<Image Source="D:\1342892_10.jpg" Focusable="True" Height="50" Stretch="Uniform" />
文字区域
<Run Text="文字区域文字区域"></Run>
<Run Text="文字区域"></Run>
</Paragraph>
<Paragraph x:Name="gara1">
<Run Text="文字区域"></Run>
<Run Text="文字区域"></Run>
</Paragraph>
</FlowDocument>
</RichTextBox.Document>
</RichTextBox>
这样就往控件里面添加了图片了。
备注：FlowDocument里面的LineHeight 属性是文字段落的间距。默认间距很大，所以这里调整一下！
当然，这样未必能够完全满足要求，因为有时候我们需要在程序运行的时候点击按钮选取图片进行添加。代码如下：
private void AddJPG_Click(object sender, RoutedEventArgs e)
{
string filepath = "";
string filename = "";
OpenFileDialog openfilejpg = new OpenFileDialog();
openfilejpg.Filter = "jpg图片(*.jpg)|*.jpg|gif图片(*.gif)|*.gif";
openfilejpg.FilterIndex = 0;
openfilejpg.RestoreDirectory = true;
openfilejpg.Multiselect = false;
if (openfilejpg.ShowDialog() == true)
{
filepath = openfilejpg.FileName;
Image img = new Image();
BitmapImage bImg = new BitmapImage();
img.IsEnabled = true;
bImg.BeginInit();
bImg.UriSource = new Uri(filepath, UriKind.Relative);
bImg.EndInit();
img.Source = bImg;
//MessageBox.Show(bImg.Width.ToString() + "," + bImg.Height.ToString());
/* 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;
}*/
img.Stretch = Stretch.Uniform; //图片缩放模式
new InlineUIContainer(img, richTextBox1.Selection.Start); //插入图片到选定位置
}
}
这样就插入了一张图片到RichTextBox里了，是不是很简单呢！
原文在此：http://blogs.msdn.com/jfoscoding/archive/2006/01/14/512825.aspx
这里仅整理出其中的知识点：
1. 取得已被选中的内容：
(1)使用 RichTextBox.Document.Selection属性
(2)访问RichTextBox.Document.Blocks属性的“blocks”中的Text
2. 在XAML中增加内容给RichTextBox:
<RichTextBox IsSpellCheckEnabled="True">
<FlowDocument>
<Paragraph>
<!-- 这里加上你的内容 -->
This is a richTextBox. I can <Bold>Bold</Bold>, <Italic>Italicize</Italic>, <Hyperlink>Hyperlink stuff</Hyperlink> right in my document.
</Paragraph>
</FlowDocument>
</RichTextBox>
3. 缩短段间距,类似<BR>,而不是<P>
方法是使用Style定义段间距:
<RichTextBox>
<RichTextBox.Resources>
<Style TargetType="{x:Type Paragraph}">
<Setter Property="Margin" Value="0"/>
</Style>
</RichTextBox.Resources>
<FlowDocument>
<Paragraph>
This is my first paragraph... see how there is...
</Paragraph>
<Paragraph>
a no space anymore between it and the second paragraph?
</Paragraph>
</FlowDocument>
</RichTextBox>
{
richTextBox.Document.Blocks.Clear();
using (StreamReader streamReader = File.OpenText(filename)) {
Paragraph paragraph = new Paragraph();
paragraph.Text = streamReader.ReadToEnd();
richTextBox.Document.Blocks.Add(paragraph);
}
}
private void LoadText(RichTextBox richTextBox, string txtContent)
{
richTextBox.Document.Blocks.Clear();
Paragraph paragraph = new Paragraph();
paragraph.Text = txtContent;
richTextBox.Document.Blocks.Add(paragraph);
}
private string GetText(RichTextBox richTextBox)
{
TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
return textRange.Text;
}
{
if (string.IsNullOrEmpty(rtf)) {
throw new ArgumentNullException();
}
TextRange textRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
using (MemoryStream rtfMemoryStream = new MemoryStream()) {
using (StreamWriter rtfStreamWriter = new StreamWriter(rtfMemoryStream)) {
rtfStreamWriter.Write(rtf);
rtfStreamWriter.Flush();
rtfMemoryStream.Seek(0, SeekOrigin.Begin);
textRange.Load(rtfMemoryStream, DataFormats.Rtf);
}
}
}
private static void LoadFile(string filename, RichTextBox richTextBox)
{
if (string.IsNullOrEmpty(filename)) {
throw new ArgumentNullException();
}
if (!File.Exists(filename)) {
throw new FileNotFoundException();
}
using (FileStream stream = File.OpenRead(filename)) {
TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
string dataFormat = DataFormats.Text;
string ext = System.IO.Path.GetExtension(filename);
if (String.Compare(ext, ".xaml",true) == 0) {
dataFormat = DataFormats.Xaml;
}
else if (String.Compare(ext, ".rtf", true) == 0) {
dataFormat = DataFormats.Rtf;
}
documentTextRange.Load(stream, dataFormat);
}
}
private static void SaveFile(string filename, RichTextBox richTextBox)
{
if (string.IsNullOrEmpty(filename)) {
throw new ArgumentNullException();
}
using (FileStream stream = File.OpenWrite(filename)) {
TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
string dataFormat = DataFormats.Text;
string ext = System.IO.Path.GetExtension(filename);
if (String.Compare(ext, ".xaml", true) == 0) {
dataFormat = DataFormats.Xaml;
}
else if (String.Compare(ext, ".rtf", true) == 0) {
dataFormat = DataFormats.Rtf;
}
documentTextRange.Save(stream, dataFormat);
}
}
<!-- Window1.xaml -->
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="_File">
<MenuItem Header="_Open File" Click="OnOpenFile"/>
<MenuItem Header="_Save" Click="OnSaveFile"/>
<Separator/>
<MenuItem Header="E_xit" Click="OnExit"/>
</MenuItem>
</Menu>
<RichTextBox Name="richTextBox1"></RichTextBox>
</DockPanel>
private void OnExit(object sender, EventArgs e) {
this.Close();
}
private void OnOpenFile(object sender, EventArgs e) {
Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();
ofd.Filter = "Text Files (*.txt; *.xaml; *.rtf)|*.txt;*.xaml;*.rtf";
ofd.Multiselect = false;
if (ofd.ShowDialog() == true) {
LoadFile(ofd.SafeFileName, richTextBox1);
}
private void OnSaveFile(object sender, EventArgs e) {
Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
sfd.Filter = "Text Files (*.txt; *.xaml; *.rtf)|*.txt;*.xaml;*.rtf";
if (sfd.ShowDialog() == true) {
SaveFile(sfd.SafeFileName, richTextBox1);
}
}
