Excel另存为_有些Excel打开时会出现一些提示

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;

namespace DealWithHtml
{
public partial class Excel另存为 : Form
{
public Excel另存为()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
//this.textBox1.Text = "";
FolderBrowserDialog openFileDialog = new FolderBrowserDialog();

if (openFileDialog.ShowDialog() == DialogResult.OK)
{
this.textBox1.Text = openFileDialog.SelectedPath;
}
else
{
return;
}

DirectoryInfo dir = new DirectoryInfo(this.textBox1.Text.Trim());
FileInfo[] files = GetFiles(); //dir.GetFiles("*.xls"); //GetFiles();
if (files == null || files.Length == 0) return;

string file = openFileDialog.SelectedPath + "\\另存为文件夹";
if (Directory.Exists(file))
{
MessageBox.Show("你已经另存为过了，若想再另存为，请先移动或删除此文件夹！");
return;
}

//File.Create(file);
Directory.CreateDirectory(file);

object missing = Missing.Value;
Microsoft.Office.Interop.Excel.Application appExcel = null;//实例Excel类
appExcel = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook workbook = null;
try
{
foreach (FileInfo info in files)
{
workbook = null;
appExcel.DisplayAlerts = false;//DisplayAlerts 属性设置成 False，就不会出现这种警告。
workbook = appExcel.Workbooks.Open(info.FullName,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);//打开Excel

string name = info.Name.Substring(0, info.Name.LastIndexOf('.')); // info.Name + "_SaveAs";
name = file + "\\" + name + "_SaveAs" + (info.Extension == ".xml" ? ".xls" : info.Extension);
workbook.SaveAs(name, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, missing, missing, missing, missing,
Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive
, missing, missing, missing, missing, missing);
}
MessageBox.Show("另存为完成！");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
Kill(appExcel);
}
}

[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);
public static void Kill(Microsoft.Office.Interop.Excel.Application excel)
{
IntPtr t = new IntPtr(excel.Hwnd);   //得到这个句柄，具体作用是得到这块内存入口
int k = 0;
GetWindowThreadProcessId(t, out k);   //得到本进程唯一标志k
System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(k);   //得到对进程k的引用
p.Kill();     //关闭进程k
GC.Collect();
}

private FileInfo[] GetFiles()
{
List<FileInfo> list = new List<FileInfo>();
DirectoryInfo dir = new DirectoryInfo(this.textBox1.Text.Trim());
FileInfo[] files1 = dir.GetFiles("*.xls");
FileInfo[] files2 = dir.GetFiles("*.xml");
list.AddRange(files1.ToList());
list.AddRange(files2.ToList());

return list.ToArray();
}
}

}