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c# DataGridView导出到Excel,如果数据列数很多，格式就会乱 #region 导出成Excel
        /// <summary>        /// 另存新档按钮        /// </summary>        public static void SaveAsExcel(DataGridView dg) //另存新档按钮   导出成Excel
        {            SaveFileDialog saveFileDialog = new SaveFileDialog();            saveFileDialog.Filter = "Execl files (*.xls)|*.xls";            saveFileDialog.FilterIndex = 0;            saveFileDialog.RestoreDirectory = true;            saveFileDialog.CreatePrompt = true;            saveFileDialog.Title = "Export Excel File To";            saveFileDialog.ShowDialog();            Stream myStream;            myStream = saveFileDialog.OpenFile();            //StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding("gb2312"));            StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));            string str = "";            try
            {
                //写标题
                for (int i = 0; i < dg.ColumnCount; i++)
                {
                    if (i > 0)
                    {
                        str += "\t";
                    }
                    str += dg.Columns[i].HeaderText;
                }
                sw.WriteLine(str);                //写内容
                for (int j = 0; j < dg.Rows.Count; j++)
                {
                    string tempStr = "";
                    for (int k = 0; k < dg.Columns.Count; k++)
                    {
                        if (k > 0)
                        {
                            tempStr += "\t";
                        }
                        tempStr += dg.Rows[j].Cells[k].Value.ToString();
                    }
                    sw.WriteLine(tempStr);
                }
                sw.Close();
                myStream.Close();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.GetBaseException().ToString());
            }
            finally
            {
                sw.Close();
                myStream.Close();
            }
        }
        #endregionC#ExcelDataGridView