listview上数据存excel时，乱码怎么回事呀？
现在就是想把listview上的数据，都拿出来，存储成一个文件里
目前存为txt文件 是正常的

但是存为excel的格式时，，当打开这个文件时，里面是乱码，，中文的乱
数字，英文字符不乱

怎么回事呢？ 谢谢

代码如下


namespace saveListview2files
{
  public partial class Form1 : Form
  {
  public Form1()
  {
  InitializeComponent();
  this.saveFileDialog1.Filter = "文本文件|*.txt|Excel表格|*.xls";

  ColumnHeader h1 = new ColumnHeader();
  h1.Width = 85;
  h1.Text = "编号";
  ColumnHeader h2 = new ColumnHeader();
  h2.Width = 100;
  h2.Text = "姓名";
  ColumnHeader h3 = new ColumnHeader();
  h3.Width = 100;
  h3.Text = "性别";
  ColumnHeader h4 = new ColumnHeader();
  h4.Width = 100;
  h4.Text = "电话";
  listView1.Columns.Add(h1);
  listView1.Columns.Add(h2);
  listView1.Columns.Add(h3);
  listView1.Columns.Add(h4);
  listView1.View = View.Details;
  listView1.GridLines = true;
  listView1.FullRowSelect = true;


  for (int i = 0; i < 100; i++)
  {
  this.listView1.Items.Add(i.ToString());
  this.listView1.Items[this.listView1.Items.Count - 1].SubItems.Add("姓名" + i);
  if (i % 2 == 0)
  this.listView1.Items[this.listView1.Items.Count - 1].SubItems.Add("男");
  else
  this.listView1.Items[this.listView1.Items.Count - 1].SubItems.Add("女");
  this.listView1.Items[this.listView1.Items.Count - 1].SubItems.Add("139999999" + i.ToString("00"));
  }

  }

  private void button1_Click(object sender, EventArgs e)
  {
  if (this.saveFileDialog1.ShowDialog() == DialogResult.OK)
  {
  string file = this.saveFileDialog1.FileName;
  FileInfo fi = new FileInfo(file);
  StreamWriter sw = fi.CreateText();
  //sw.WriteLine("ID\tName\tSex\tTel");
  sw.WriteLine("编号\t姓名\t性别\t电话");
  for (int i = 0; i < this.listView1.Items.Count; i++)
  {
  sw.WriteLine(string.Format("{0}\t{1}\t{2}\t{3}", listView1.Items[i].Text, listView1.Items[i].SubItems[1].Text, listView1.Items[i].SubItems[2].Text, listView1.Items[i].SubItems[3].Text));
  }
  sw.Close();
  //System.Diagnostics.Process.Start(file);
  }


  }
  }
}


------解决方案--------------------

StreamWriter sw = new StreamWriter(file,Encoding.GetEncoding("GB2312"))

or

StreamWriter sw = new StreamWriter(file,Encoding.GetEncoding("utf-8"))

测试