Tips for Using RichTextBox in WPF (translation and Arrangement)

Here: http://blogs.msdn.com/jfoscoding/archive/2006/01/14/512825.aspx

Here, only the knowledge points are sorted out:
1. Obtain the selected content:
(1) Use the RichTextBox. Document. Selection attribute
(2) Access text in the "blocks" of the RichTextBox. Document. Blocks attribute

2. add content to RichTextBox in XAML:
<RichTextBox isspellcheckenabled = "true">
<Flowdocument>
<Paragraph>
<! -- Add your content here -->
This is a RichTextBox. I can <bold> bold </bold>, <italic> italicize </italic>, </Paragraph>
</Flowdocument>
</RichTextBox>

3. Shorten the segment spacing, similar to <br>, instead of <p>
You can use style to define the segment Spacing:
<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>

4. Read the plain text file from the file and put it into RichTextBox or directly put the text into RichTextBox:Private void loadtextfile (RichTextBox, string filename)
{
RichTextBox. Document. blocks. Clear ();
Using (streamreader = file. opentext (filename )){
Paragraph paragraph = new paragraph ();
Paragraph. Text = streamreader. readtoend ();
RichTextBox. Document. blocks. Add (paragraph );
}
}

Private void loadtext (RichTextBox, string txtcontent)
{
RichTextBox. Document. blocks. Clear ();
Paragraph paragraph = new paragraph ();
Paragraph. Text = txtcontent;
RichTextBox. Document. blocks. Add (paragraph );
}5. Get the content of the specified RichTextBox:
Private string gettext (RichTextBox)
{
Textrange = new textrange (RichTextBox. Document. contentstart, RichTextBox. Document. contentend );
Return textrange. text;
}6. Place the Rich Text Format In the RichTextBox:Private Static void loadrtf (string RTF, RichTextBox)
{
If (string. isnullorempty (RTF )){
Throw new argumentnullexception ();
}
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); // load the memorystream into textrange ranging from start to end of RichTextBox.
Textrange. Load (rtfmemorystream, dataformats. rtf );
}
}
}7. Load the content in the file as the content of RichTextBox
Private Static void LoadFile (string filename, 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 );
}
}8. Save the content of RichTextBox as a file:
Private Static void SaveFile (string filename, 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 );
}
}9. Make a simple Editor:
<! -- 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>
// Window1.xaml. CS
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 );
}
}