private void SynchronzieFontFamilies()
        {
            Object obj = null;
            //显示当前字体
            if (RichTextBox1.Selection.IsEmpty)  //如果当前没选中文字
            {
                TextRange nearestChar = rtfManager.GetPrevChar(RichTextBox1.CaretPosition);
                if ((nearestChar != null) && MySuperEditorHelper.IsTwoByteChineseChar(nearestChar.Text))
                    //是汉字,获取离光标最近字符的字体
                    obj = nearestChar.GetPropertyValue(TextElement.FontFamilyProperty);
                else
                    //不是汉字,或者文档为空直接调用RichTextBox默认功能实现
                    obj = RichTextBox1.Selection.GetPropertyValue(TextElement.FontFamilyProperty);
            }
            else //如果当前选中文字
                obj = RichTextBox1.Selection.GetPropertyValue(TextElement.FontFamilyProperty);

            if (obj is FontFamily) //设置字体下拉框选项为当前字体
            {
                String FontName = MySuperEditorHelper.GetLocaliteFontName((FontFamily)obj);
                //此句居然会引发TabControl的SelectionChanged事件?真是诡异!
                cboFontFamilies.Text = FontName;

            }


        }
        private void SynchronzieFontFamilies()
        {
            Object obj = null;

            //显示当前字体
            if (RichTextBox1.Selection.IsEmpty)  //如果当前没选中文字
            {
                TextRange nearestChar = rtfManager.GetPrevChar(RichTextBox1.CaretPosition);
                if ((nearestChar != null) && MySuperEditorHelper.IsTwoByteChineseChar(nearestChar.Text))
                {
                    //是汉字,获取离光标最近字符的字体
                    obj = nearestChar.GetPropertyValue(TextElement.FontFamilyProperty);
                }
                else
                {
                    //不是汉字,或者文档为空直接调用RichTextBox默认功能实现
                    obj = RichTextBox1.Selection.GetPropertyValue(TextElement.FontFamilyProperty);
                }
            }
            else //如果当前选中文字
            {
                obj = RichTextBox1.Selection.GetPropertyValue(TextElement.FontFamilyProperty);
            }
        }