C# winfrom 批量高效十几万数据导出EXCEL

#region 导出EXCEL

        private void ExportExcels(List<DJMXView> djmxViewList)

        {

            SaveFileDialog saveDialog = new SaveFileDialog();

            saveDialog.DefaultExt = "xlsx";

            saveDialog.Filter = "Excel文件|*.xlsx";

            saveDialog.FileName = $"{dateTimePicker_start.Text}_{dateTimePicker_end.Text}.xlsx";

            if (saveDialog.ShowDialog() == DialogResult.OK)

            {

                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

                Workbooks books = excel.Workbooks;

                Workbook xlbook = books.Add(true);

                Worksheet xlsheet = (Worksheet)xlbook.ActiveSheet;

                Type type = typeof(DJMXView);

                //一共多少列

                int colnum = type.GetProperties().Length;

                //一共多少行

                int rowNum = djmxViewList.Count+1;

                //创建二维数组

                Array arr = new object[rowNum, colnum];

                //写入标题

                for (int i = 0; i < colnum; i++)

                {

                    PropertyInfo item = type.GetProperties()[i];

                    arr.SetValue(item.GetRemak(), 0, i);

                }

                //写入value

                for (int i = 0; i < djmxViewList.Count; i++)

                {

                    for (int j = 0; j < colnum; j++)

                    {

                        PropertyInfo item = type.GetProperties()[j];

                       // string str = $"{item.GetValue(djmxViewList[i], null)}".Replace("\n", "");

                        arr.SetValue(item.GetValue(djmxViewList[i]), i+1, j);

                    }

                }

                //一次性写入到excel的sheet中，减少对excel文件的I/O操作次数，提高效率

                Range range = xlsheet.Range[xlsheet.Cells[1, 1], xlsheet.Cells[rowNum, colnum]];

                range.Value2 = arr;

                //excel表头添加背景色与字体颜色

                Range rangeHeader = xlsheet.Range[xlsheet.Cells[1, 1], xlsheet.Cells[1, colnum]];

                rangeHeader.Interior.Color = System.Drawing.Color.Teal;

                rangeHeader.Font.Color = System.Drawing.Color.White;

                excel.Columns.AutoFit();

                xlbook.Saved = true;

                xlbook.SaveCopyAs(saveDialog.FileName);

                excel.Quit();

                MessageBox.Show($"导出成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

        }

        #endregion

 //提供一个额外的信息
    [AttributeUsage(AttributeTargets.Enum | AttributeTargets.Property)]
    public class RemarkAttribute:Attribute
    {
        public string Remark { get; private set; }
        public RemarkAttribute(string remark)
        {
            this.Remark = remark;
        }
    }

    //静态类
    public static class RemarkExtend
    {
        //this 表示扩展方法
        public static string GetRemak(this PropertyInfo propertyInfo)
        {
                if (propertyInfo.IsDefined(typeof(RemarkAttribute), true))
                {
                    RemarkAttribute remarkAttribute = (RemarkAttribute)propertyInfo.GetCustomAttribute(typeof(RemarkAttribute));
                    return remarkAttribute.Remark;
                }
                else
                {
                    return propertyInfo.Name;
                }
        }
    }

Model如下

导出的EXCEL如下: