Devexpress 明细报表

    public class InOrder
    {
        public String Title { get; set; }
        public String EmpNo { get; set; }
        public List<InOrderItem> Items { get; set; }
        public decimal? GroupSum
        {
            get
            {
                return Items.Sum(ent => ent.Amount);
            }
        }
        public InOrder()
        {
            Items = new List<InOrderItem>();
        }
    }
    public class InOrderItem
    {
        public long? Id { get; set; }
        public decimal? Amount { get; set; }
        public String Name { get; set; }
    }

        public List<InOrder> Orders = new List<InOrder>();
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var rnd = new Random(Environment.TickCount);
            for (int i = 0; i < 10; i++)
            {
                var order = new InOrder();
                order.EmpNo = "00102" + i;
                order.Title = "入库单" + Guid.NewGuid().ToString();
                Orders.Add(order);
                var itemCount = rnd.Next(10, 60);
                for (int j = 0; j < itemCount; j++)
                {
                    var item = new InOrderItem();
                    order.Items.Add(item);
                    item.Id = j;
                    item.Name = "项目" + Path.GetRandomFileName();
                    item.Amount =(decimal) rnd.NextDouble() * 100;
                   
                }
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            #region
            var rpt = new XtraReport1();
            rpt.DataSource = Orders;
            rpt.RequestParameters = false;
            rpt.PrintingSystem.ShowMarginsWarning = false;
            rpt.PrintingSystem.ShowPrintStatusDialog = false;
            ReportPrintTool printTool = new ReportPrintTool(rpt);
            printTool.Report.CreateDocument(false);
            printTool.PrintingSystem.ShowMarginsWarning = false;
            Application.DoEvents();
            printTool.ShowPreviewDialog();
            #endregion
        }

先设置下报表尺寸为A4
A4= 210mm × 297 mm

Letter= 216mm × 279mm （8.5X11英寸）度

letter size是纸张尺寸的一种，主要应用与美国、墨西哥和加拿大等国家。