Question

我正在尝试开发一个功能，用户可以从hastags和FriendList列表中进行选择，并在使用自动建议输入时将其添加到RichEditBox，有点像自动完成。这是执行此操作的代码。

private void MentionSuggestionList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count > 0)
        {
            bool flag = false;
            int index = 0;
            for (int i = PostRichEditBox.Document.Selection.EndPosition - 1; i >= 0; i--)
            {
                if (Char.IsLetterOrDigit(_postText[i]) || _postText[i] == '_')
                {
                    continue;
                }
                else if (_postText[i] == '@' || _postText[i] == '#')
                {
                    flag = true;
                    index = i + 1;
                    break;
                }
                else
                {
                    break;
                }
            }
            if (flag)
            {
                PostRichEditBox.Document.Selection.StartPosition = index;

                //AccessViolationException here
                PostRichEditBox.Document.Selection.SetText(TextSetOptions.None, (e.AddedItems[0] as MentionUserModel).screenName + " "); 
                PostRichEditBox.Document.Selection.StartPosition = PostRichEditBox.Document.Selection.EndPosition;
            }
        }
    }

但是当我更改richeditbox的选择文本时，我会随机获取AccessViolation。它随机但频繁，以至于每次只能尝试复制它。我甚至可以抓住这个例外。我该怎么办？

与msdn here上的问题相似，根据该问题，它是一个已知问题。但Rudy huyn的6tag完美无瑕。如何？

我尝试使用TextBox更改RichEditBox，它仍然会在该控件上发生。

Answer 1

通过更改RichEditBox外部的所有文本然后再添加它来解决它。这只是一个解决方法。我希望win rt更稳定，功能丰富，如银光。

private void MentionSuggestionList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        int endpos = PostRichEditBox.Document.Selection.EndPosition;
        int startpos = PostRichEditBox.Document.Selection.StartPosition;
        if (e.AddedItems.Count > 0)
        {
            bool flag = false;
            int index = 0;
            for (int i = PostRichEditBox.Document.Selection.EndPosition - 1; i >= 0; i--)
            {
                if (Char.IsLetterOrDigit(_postText[i]) || _postText[i] == '_')
                {
                    continue;
                }
                else if (_postText[i] == '@' || _postText[i] == '#')
                {
                    flag = true;
                    index = i + 1;
                    break;
                }
                else
                {
                    break;
                }
            }
            if (flag)
            {
                //PostRichEditBox.Document.Selection.StartPosition = index;
                //PostRichEditBox.Document.Selection.EndPosition = endpos;
                String post="";
                PostRichEditBox.Document.GetText(TextGetOptions.None, out post);
                string result = post.Substring(0, index);
                result = result + (e.AddedItems[0] as MentionUserModel).screenName + " ";
                result = result + post.Substring(endpos, (post.Length - 1) - endpos);

                int size = endpos - index;
                size = ((e.AddedItems[0] as MentionUserModel).screenName + " ").Length - size;

                PostRichEditBox.Document.SetText(TextSetOptions.None, result);
                //PostRichEditBox.Document.Selection.SetText(TextSetOptions.None, (e.AddedItems[0] as MentionUserModel).screenName + " ");
                PostRichEditBox.Document.Selection.StartPosition = PostRichEditBox.Document.Selection.EndPosition = size + endpos;
            }
        }
    }

Answer 2

您可以使用以下语法重试：

PostRichEditBox.Document.Selection.FormattedText.SetText(…);

这应该永久解决您的问题而不使用变通办法。我的祝福！

更改RichEditBox Selection Text会引发AccessViolationException

2 个答案: