数据库下载word预览功能的研究

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Office.Interop.Word;

namespace WordTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {

            if (openFileDialog1.ShowDialog() != System.Windows.Forms.DialogResult.OK) {
                return;
            }
            string str = openFileDialog1.FileName;//这里用选择文件的形式模拟下载的文件
            object sorceDocPath = str;//下载文件的路径

            #region 打开word 复制内容
            object readOnly = false;
            object isVisible = false;
            Object Nothing = System.Reflection.Missing.Value;
            object objDocType = WdDocumentType.wdTypeDocument;
            object type = WdBreakType.wdSectionBreakContinuous;
            Microsoft.Office.Interop.Word.Application wordApp1 = new Microsoft.Office.Interop.Word.ApplicationClass();
            Document openWord;
            openWord = wordApp1.Documents.Open(ref sorceDocPath, ref Nothing, ref readOnly, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref Nothing, ref isVisible, ref Nothing, ref Nothing, ref Nothing, ref Nothing);
            openWord.Select();
            openWord.Sections[1].Range.Copy();
            #endregion

            #region 打开word 粘贴内容 显示
            Microsoft.Office.Interop.Word.Application wordApp = new Microsoft.Office.Interop.Word.ApplicationClass();
            Microsoft.Office.Interop.Word.Document newWordDoc = wordApp.Documents.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            newWordDoc.Sections[1].Range.PasteAndFormat(WdRecoveryType.wdPasteDefault);
            System.Threading.Thread.Sleep(100);
            Clipboard.Clear();
            openWord.Close(ref Nothing, ref Nothing, ref Nothing);
            wordApp1.Quit(ref Nothing, ref Nothing, ref Nothing);
            wordApp.Visible = true;
            #endregion
            System.Threading.Thread.Sleep(500);
            System.IO.File.Delete(str);//测试的时候要注意 这里会把源文件删除！！
            GC.Collect();
        } 
    }
}