C# 突出显示Outlook.mailItem中的特定Word.Range

我还尝试从该范围中获取文本，并使用Word.Find对象和对该文本使用Find.HitHighlight方法，但问题是突出显示的文本外观超出了指定范围

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任何帮助都将不胜感激

我想知道这一点，但我无法重现这一错误。对我来说，它奏效了。使用Outlook 2016。也许问题与范围的内容有关？

Outlook.Inspector = Globals.ThisAddIn.Application.ActiveInspector();
Word.Document document = (Word.Document)inspector.WordEditor;

//I have some code that determines start and end of the range i want to highlight.
//lets say they are:
object start = 0;
object end = 5;

Word.Range rng = document.Range(ref start, ref end);

//I have tried this but it didn't work but it throws an exception that Highlight 
//section is disabled or something like that.
rng.HighlightColorIndex  = WdColorIndex.wdYellow;