在 ASP.NET MVC 的报表查看器中加入 2 个表

Question

我在 ASP.NET MVC 中在 2 个表之间创建了报表查看器。

我创建了适配器来获取报告中的所有数据，如下所示：

但是当我这样导出报告时，expence_type 不显示数据：

这是我的代码：

 public ActionResult Reports(string ReportType)
    {
        LocalReport localreport = new LocalReport();
        localreport.ReportPath = Server.MapPath("~/Reports/ExpenseReport.rdlc");



        ReportDataSource reportDataSource = new ReportDataSource();

        reportDataSource.Name = "DataSetE";

        var dataList = (from ed in _context.ExpenseDetails
         join e in _context.Expenses on ed.ExpensesId equals e.Expenses_Id

     select new { id = ed.ExpenseDetails_Id, amount = ed.Amount, expense = ed.DateExpense, eid = ed.ExpensesId, expenseType = e.Expenses_Type }).ToList();

        reportDataSource.Value = dataList;


        reportDataSource.Value = _context.ExpenseDetails.ToList();

        localreport.DataSources.Add(reportDataSource);

        string reportType = ReportType;
        string mimeType;
        string encoding;
        string fileNameExtension;

        if (reportType == "Excel")
        {
            fileNameExtension = "xlsx";
        }

        if (reportType == "Word")
        {
            fileNameExtension = "docx";
        }

        if (reportType == "PDF")
        {
            fileNameExtension = "pdf";
        }

        else
        {
            fileNameExtension = "jpg";

        }

        string[] streams;
        Warning[] warnings;
        byte[] renderedByte;

        renderedByte = localreport.Render(reportType, "", out mimeType, out encoding, out fileNameExtension, out streams, out warnings);

        Response.AddHeader("content-disposition", "attachment;filename = expens_report." + fileNameExtension);

        return File(renderedByte, fileNameExtension);
    }

费用明细模型：

public class ExpenseDetails
{
    [Key]
    public int ExpenseDetails_Id { get; set; }

    public double Amount { get; set; }

    public DateTime DateExpense { get; set; }

    public int ExpensesId { get; set; }

    [ForeignKey("ExpensesId")]
    public virtual Expenses expenses { get; set; }
}

费用模型：

   public class Expenses
{
    [Key]
    public int Expenses_Id { get; set; }
    public string Expenses_Type { get; set; }
}

如何显示Expence_Type？

reportDataSource.Value = _context.ExpenseDetails.ToList();

我试图在这段代码中添加另一个表，但没有返回。

Answer 1

您可以在两个表之间创建连接并将其指定为您的报表数据源

试试这个

var dataList = (from ed in _context.ExpenseDetails
                 join e in _context.Expenses on ed.ExpensesId equals e.Expenses_Id 
                 select new {
                     id = ed.ExpenseDetails_Id ,
                     amount = ed.Amount ,
                     expense = ed.DateExpense ,
                     eid = ed.ExpensesId ,
                     expenseType = e.Expenses_Type 
                 }).ToList();

并添加这个

reportDataSource.Value = dataList ;