转自博客：
http://blog.csdn.net/michellehsiao/article/details/7684309
小知识点：.Net Framework 4.0 和.Net Framework 4.0 Client Profile区别：
.NET Framework Client Profile是.NET Framework的裁剪版本。它面向客户端应用程序。它提供 Windows Presentation Foundation (WPF)、Windows 窗体、Windows Communication Foundation (WCF)和 ClickOnce 功能的简化子集。这可以为面向.NET Framework Client Profile 的 WPF、Windows 窗体、WCF 和控制台应用程序实现快速部署方案。
主要内容：
当在 Visual Studio 2010 建立新项目时，如果发现 [添加引用] 中没有列出原本应该列出的组件时，可以先检查是否是项目的目标框架是否设成了 .NET 4.0 Client Profile (例如 System.Web.dll 就不在 .NET 4.0 Client Profile 套件中)。
1、添加引用：COM组件下的Microsoft Word 11.0 Object Library ，然后会出现Microsoft Office Core和Word以及VBIDE的引用，如下图
2、修改项目属性嵌入互操作类型为false，
3、接着在命名空间中写入如下内容：
这样就可以顺利使用下面代码，而不会出错！
Word.ApplicationClass app = new Word.ApplicationClass();
Word.Document doc = null;
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public void OpenWord(string fileName)
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{
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Word.ApplicationClass app = new Word.ApplicationClass();
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Word.Document doc = null;
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object missing = System.Reflection.Missing.Value;
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object File = fileName;
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object readOnly = false;
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object isVisible = true;
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try
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{
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doc = app.Documents.Open(ref File, ref missing, ref readOnly,
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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 isVisible, ref missing,
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ref missing, ref missing, ref missing);
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doc.ActiveWindow.Selection.WholeStory();
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doc.ActiveWindow.Selection.Copy();
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richTextBox1.Paste();
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}
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finally
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{
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if (doc != null)
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{
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doc.Close(ref missing, ref missing, ref missing);
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doc = null;
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}
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if (app != null)
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{
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app.Quit(ref missing, ref missing, ref missing);
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app = null;
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}
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}
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}
修改RichTextBox内容后，另存为功能实现代码如下：
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public void SaveAsWord(string fileName)
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{
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Word.ApplicationClass app = new Word.ApplicationClass();
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Word.Document doc = null;
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object missing = System.Reflection.Missing.Value;
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object File = fileName;
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try
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{
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doc = app.Documents.Add(ref missing, ref missing, ref missing, ref missing);
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doc.ActiveWindow.Selection.WholeStory();
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richTextBox1.SelectAll();
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Clipboard.SetData(DataFormats.Rtf, richTextBox1.SelectedRtf);
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doc.ActiveWindow.Selection.Paste();
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doc.SaveAs(ref File, ref missing, ref missing,
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ref missing, ref missing, ref missing,
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ref missing, ref missing, ref missing,
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ref missing, ref missing, ref missing,
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ref missing, ref missing, ref missing,
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ref missing);
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}
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finally
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{
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if (doc != null)
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{
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doc.Close(ref missing, ref missing, ref missing);
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doc = null;
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}
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if (app != null)
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{
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app.Quit(ref missing, ref missing, ref missing);
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app = null;
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}
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}
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}
