c#中txt与datagridview的数据交互

参考自：http://blog.csdn.net/polly_yang/article/details/8026149

一. txt中数据显示到datagridview中

    private void button2_Click(object sender, EventArgs e)              {                 //新建一个datatable用于保存读入数据                  DataTable dt = new DataTable();                  dt.Columns.Add("飞机编号", typeof(string));                  dt.Columns.Add("到达时间", typeof(string));                  dt.Columns.Add("剩余油量", typeof(string));                  dt.Columns.Add("请求类型：起飞/降落", typeof(string));                  //读入文件                  StreamReader sr = new StreamReader(file_path, Encoding.Default);                  while(!sr.EndOfStream)                  {                      string[] items = sr.ReadLine().Split(' ');                      DataRow dr = dt.NewRow();                      dr[0] = items[0];                      dr[1] = items[1];                      dr[2] = items[2];                      dr[3] = items[3];                      dt.Rows.Add(dr);                  }                  //将datatable绑定到datagridview上显示结果                  dataGridView1.DataSource = dt;              }  

二.datagridview保存到txt中

     private void btnExportTxt_Click(object sender, EventArgs e)        {            string outFilePath = "";            SaveFileDialog SaveFileDialog1 = new SaveFileDialog();            SaveFileDialog1.Title = "导出TXT结果";            SaveFileDialog1.Filter = "导出TXT结果 (*.txt)|*.txt";            if (SaveFileDialog1.ShowDialog() == DialogResult.OK)            {                string saveFilename = SaveFileDialog1.FileName;                if (!string.IsNullOrEmpty(saveFilename))                {                    outFilePath = SaveFileDialog1.FileName;                }            }            if (outFilePath == "")            {                MessageBox.Show("导出路径不存在！");                return;            }            if (dataGridView == null || dataGridView.Rows.Count == 0)            {                MessageBox.Show("导出行数不能为空！");                return;            }            FileStream fileStream = new FileStream(outFilePath, FileMode.OpenOrCreate);            StreamWriter streamWriter = new StreamWriter(fileStream, System.Text.Encoding.Unicode);            StringBuilder strBuilder = new StringBuilder();            try            {                //添加列名  \t为制表符Tab                for (int j = 0; j < dataGridView.Columns.Count; j++)                {                    strBuilder.Append(dataGridView.Columns[j].Name.ToString() + "\t");                }                streamWriter.WriteLine(strBuilder.ToString());                //添加每行数据                for (int i = 0; i < dataGridView.Rows.Count; i++)                {                    strBuilder = new StringBuilder();                    for (int j = 0; j < dataGridView.Columns.Count; j++)                    {                        strBuilder.Append(dataGridView.Rows[i].Cells[j].Value.ToString() + "\t");                    }                    streamWriter.WriteLine(strBuilder.ToString());                }            }            catch (Exception ex)            {                MessageBox.Show(ex.Message);            }            finally            {                streamWriter.Close();                fileStream.Close();                MessageBox.Show("导出完成！");            }           }

3.如果需要导出多个datagridview的数据，可以将
FileStream fileStream = new FileStream(filename, FileMode.OpenOrCreate);
改成：
FileStream fileStream = new FileStream(filename, FileMode.Append);
文件流以追加的形式写进去，这样后面DataGridView的数据也追加进去。