主要參考StoryRanges，NextStoryRange，WdStoryType，Range這幾個類。
Replace text in Word textbox objects using VSTO and C#
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/// <summary>
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/// 查找並替換文本
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/// </summary>
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/// <param name="wordApp"></param>
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/// <param name="oldStr"></param>
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/// <param name="newStr"></param>
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public void SearchReplace(string oldStr, string newStr)
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{
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#region 文字區域
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object replaceAll = WdReplace.wdReplaceAll;
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wordApp.Selection.Find.ClearFormatting();
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wordApp.Selection.Find.Text = oldStr;
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wordApp.Selection.Find.Replacement.ClearFormatting();
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wordApp.Selection.Find.Replacement.Text = newStr;
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wordApp.Selection.Find.Execute(
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ref missing, ref missing, ref missing, ref missing, ref missing,
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ref missing, ref missing, ref missing, ref missing, ref missing,
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ref replaceAll, ref missing, ref missing, ref missing, ref missing);
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#endregion
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#region 文本框
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StoryRanges sr = wordDoc.StoryRanges;
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