CrystalReports数据字段全部为空

Question

我正在使用VS社区2017和CrystalReports的sp25。

我制作了一个程序，该程序应该将List对象中的数据显示到CrystalReport窗口中。这是列表类：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AgricoveBilling
{
    public class reporter : IEnumerable<reporter>
    {
        public string InvoiceNo { get; set; }
        public string InvoiceDt { get; set; }
        public string DueDt { get; set; }
        public string BillToName { get; set; }
        public string BillToAdd { get; set; }

        public string ItemID1Name { get; set; }
        public decimal ItemID1Price { get; set; }
        public decimal ItemID1Qty { get; set; }
        public decimal ItemID1Total { get; set; }
        public string ItemID2Name { get; set; }
        public decimal ItemID2Price { get; set; }
        public decimal ItemID2Qty { get; set; }
        public decimal ItemID2Total { get; set; }
        public string ItemID3Name { get; set; }
        public decimal ItemID3Price { get; set; }
        public decimal ItemID3Qty { get; set; }
        public decimal ItemID3Total { get; set; }
        public string ItemID4Name { get; set; }
        public decimal ItemID4Price { get; set; }
        public decimal ItemID4Qty { get; set; }
        public decimal ItemID4Total { get; set; }
        public string ItemID5Name { get; set; }
        public decimal ItemID5Price { get; set; }
        public decimal ItemID5Qty { get; set; }
        public decimal ItemID5Total { get; set; }
        public string ItemID6Name { get; set; }
        public decimal ItemID6Price { get; set; }
        public decimal ItemID6Qty { get; set; }
        public decimal ItemID6Total { get; set; }
        public string ItemID7Name { get; set; }
        public decimal ItemID7Price { get; set; }
        public decimal ItemID7Qty { get; set; }
        public decimal ItemID7Total { get; set; }
        public string ItemID8Name { get; set; }
        public decimal ItemID8Price { get; set; }
        public decimal ItemID8Qty { get; set; }
        public decimal ItemID8Total { get; set; }
        public string ItemID9Name { get; set; }
        public decimal ItemID9Price { get; set; }
        public decimal ItemID9Qty { get; set; }
        public decimal ItemID9Total { get; set; }
        public string ItemID10Name { get; set; }
        public decimal ItemID10Price { get; set; }
        public decimal ItemID10Qty { get; set; }
        public decimal ItemID10Total { get; set; }
        public string ItemID11Name { get; set; }
        public decimal ItemID11Price { get; set; }
        public decimal ItemID11Qty { get; set; }
        public decimal ItemID11Total { get; set; }

        public decimal Subtotal { get; set; }
        public string DiscountType { get; set; }
        public decimal DiscountValue { get; set; }
        public decimal SubtotalLessDiscount { get; set; }
        public decimal TaxRate { get; set; }
        public decimal Totaltax { get; set; }
        public decimal GrossTotal { get; set; }
        public decimal Paid { get; set; }
        public decimal Due { get; set; }

        public IEnumerator<reporter> GetEnumerator()
        {
            throw new NotImplementedException();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            throw new NotImplementedException();
        }
    }
}

我已将报告程序类设置为数据源

CrystalReportViewer嵌入的窗体具有以下代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using CrystalDecisions.CrystalReports.Engine;

namespace AgricoveBilling
{
    public partial class Printpreview : Form
    {
        List<reporter> rep;
        public Printpreview(List<reporter> r)
        {
            InitializeComponent();
            rep = r;      
        }

        private void Printpreview_Load(object sender, EventArgs e)
        {
            ReportDocument rpt = new ReportDocument();
            rpt.Load(@"..\printform.rpt");
            rpt.SetDataSource(rep);
            print_crystalreport.ReportSource = rpt;            
            print_crystalreport.Zoom(55);
            print_crystalreport.Refresh();

        }
    }
} 

没有错误。使用QuickWatch，我检查了所有C＃对象是否正确加载。我知道正在加载正确的rpt文件，因为报表上的Text对象是正确的。

但是报告上绝对没有数据。

说实话：我不知道CrystalReports如何将正确的字段与正确的数据绑定在一起。我是否应该在某个地方写一些代码来做到这一点？

我尝试将iEnumerable更改为常规类，但是随后在SetDataSoruce期间被告知该对象是无效的数据源。我尝试手动使用SetParamerterValue，但是那样会出现Badindex错误。我确保参数名称正确。