C# 如何使用TextRange替换跑步的字母？

我对FlowDocuments完全陌生，似乎在任何地方都找不到它

我创建了一个文本块，其中每个内联都是一个只包含一个单词的运行。内联线是在代码中创建的。然后，我使用TextRange替换运行中的一些字母。但是TextRange似乎没有替换运行的字符，而是清空运行并将字母附加到上一次运行

保留原始运行对象的原始TextBlock结构很重要，因为我将事件绑定到它们

我做错了什么？Text=Text实际在做什么

感谢您的帮助

范例

  ---Before textrange--
<Run>
6||perrla
</Run>
<Run>
1||                       **NOTE THIS IS A SPACE IN THE RUN
</Run>
<Run>
5||nc/at
</Run>

--After textrange --- 
<Run>           **NOTE THE EMPTY RUN
</Run>
<Run>
5|| test    **NOTE HOW TEST IS APPENDED TO THE SPACE OF THE PREVIOUS RUN
</Run>
<Run>
5||nc/at
</Run>

GetXaml来自Microsoft，我将其略微修改为：

     void GetXaml(TextElement element)
    {
        // Position a "navigator" pointer before the opening tag of the element.
        TextPointer navigator = element.ElementStart;

        while (navigator.CompareTo(element.ElementEnd) < 0)
        {
            switch (navigator.GetPointerContext(LogicalDirection.Forward))
            {
                case TextPointerContext.ElementStart:
                    // Output opening tag of a TextElement
                    Console.WriteLine(String.Format("<{0}>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name));
                    break;
                case TextPointerContext.ElementEnd:
                    // Output closing tag of a TextElement
                    Console.WriteLine(String.Format("</{0}>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name));
                    break;
                case TextPointerContext.EmbeddedElement:
                    // Output simple tag for embedded element
                    Console.WriteLine(String.Format("<{0}>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name));
                    break;
                case TextPointerContext.Text:
                    // Output the text content of this text run
                    Console.WriteLine(String.Format("{0}||{1}", navigator.GetTextRunLength(LogicalDirection.Forward),
                        navigator.GetTextInRun(LogicalDirection.Forward)));
                    break;
            }

            // Advance the naviagtor to the next context position.
            navigator = navigator.GetNextContextPosition(LogicalDirection.Forward);

        } 
    } 

---

这似乎是因为TextRange.Start始终具有逻辑方向或后退。因此，它将文本放在前一个元素中

也许我针对我的特殊情况所做的修复可以帮助您解决您自己的问题：

if (this.Selection.Start.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
    this.Selection.End.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd &&
    this.Selection.Start.Parent == this.Selection.End.Parent && this.Selection.Start.Parent is Run)
{
     ((Run)this.Selection.Start.Parent).Text = "NewText";
}

if (this.Selection.Start.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
    this.Selection.End.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd &&
    this.Selection.Start.Parent == this.Selection.End.Parent && this.Selection.Start.Parent is Run)
{
     ((Run)this.Selection.Start.Parent).Text = "NewText";
}