Silverlight 4 RichTextBox - can't restore Xaml with text containing curly braces

问题

We have a Silverlight application using the RichTextBox as a rich text editor for the user to create emails.

We actually have our own serializer but essentially we are saving and restoring the Xaml. As far as I can tell it is impossible to restore any text containing curly braces.

You can demonstrate this fairly easily by creating a RichTextBox and typing something similar to {weird} into it. Then take the .Xaml property of the textbox and set it on the .Xaml property of another textbox - kablooie.

As we have our own serializer I have tried escaping the Text member of the Run elements with <Run Text="{} the real {Text} here" />. This makes no difference. I've tried replacing the braces with { but that doesn't work either.

回答1:

Acknowledging the issue here and checking with the team. If the Run starts with curly braces it appears to throw a value exception. I'm investigating.

回答2:

This issue also occurs in the Windows Phone 7 (Mango) RichTextBox. I found a workaround here which consists of putting a zero-width non-joiner ‌ character at the beginning and end of each Run. As opposed to using the zero-width space this also works if you have an opening curly brace at the beginning and a closing curly brace at the end.

回答3:

This sounds like a xml problem. Have you tried encapsulating your data in a CDATA block to encapsulate any special characters?

<richtext>

    <![CDATA[
    function matchwo(a,b)
    {
    if (a < b && a < 0) then
      {
      return 1;
      }
    else
      {
      return 0;
      }
    }
    ]]>

<richtext>

回答4:

A Silverlight developer has confirmed this as a bug. It happens if the Run Text starts with a '{' or a space followed by '{'. Because we have our own serializer I can insert a zero width space () at the start of every run which solves the problem.

回答5:

try escaping with {}{weird}(open and closed curly braces)

来源：https://stackoverflow.com/questions/2999782/silverlight-4-richtextbox-cant-restore-xaml-with-text-containing-curly-braces

标签

.net

silverlight

xaml

richtextbox