C#中打开word 文件并在richTextBox中显示

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打开word文档到richtextbox 打开word文档到richtextbox: 阅读详情

void OpenNewChildForm()
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "(文本文件)|*.txt|(word文件)|*.doc";
            ofd.FilterIndex = 1;
            if (ofd.ShowDialog(this) == DialogResult.OK)
            {
                MDIChild child = new MDIChild();
                child.Text = ofd.FileName;
                child.MdiParent = this;
                // 如果打开的是 word 或者是 .txt 文件，就执行下面的代码；
                if (ofd.FilterIndex == 2 || ofd.FilterIndex == 1)
                {
                    Word.Application wordApp = new Word.Application();
                    Word.Document doc = null;
                    object missing = System.Reflection.Missing.Value;
                    object fileName = ofd.FileName;
                    object readOnly = false;
                    object isVisible = true;
                    object index = 0;
                    try
                    {
                        doc = wordAp