导出为文本格式

  public void DataTable2Txt(DataTable dt, string fullFileName)
        {
            if (dt == null) return;
            try
            {
                using (FileStream fs = new FileStream(fullFileName, FileMode.Create))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        for (int i = 0; i < dt.Rows.Count; i++)
                        {
                            for (int j = 0; j < dt.Columns.Count; j++)
                            {
                                sw.Write(dt.Rows[i][j].ToString() + "\t");
                            }
                            sw.WriteLine();
                        }
                        sw.Close();
                    }
                }
            }
            catch
            {
                throw;
            }
        }

        public void DataGridView2Txt(DataGridView dgv, string fullFileName)
        {
            if (dgv == null) return;
            try
            {
                using (FileStream fs = new FileStream(fullFileName, FileMode.Create))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        for (int j = 0; j < dgv.ColumnCount; j++)
                        {
                            sw.Write(dgv.Columns[j].HeaderText + "\t");
                        }
                        sw.WriteLine();
                        int rowCount = dgv.RowCount;
                        if (dgv.AllowUserToAddRows) rowCount--;
                        for (int i = 0; i < rowCount; i++)
                        {
                            for (int j = 0; j < dgv.Columns.Count; j++)
                            {
                                // 第一行是标题行
                                sw.Write(dgv[j, i].Value.ToString() + "\t");
                            }
                            sw.WriteLine();
                        }
                        sw.Close();
                    }
                }
            }
            catch
            {
                throw;
            }
        }