无法打印单条记录，而不是在水晶报表和 Linq 中获取多条记录

Question

我想在水晶报告中打印 1 条记录或单个注册学生的详细信息。但在这里我得到了多条记录。如何编写代码来获取表的单条记录/最新记录

    StudentDBEntities db = new StudentDBEntities();
    CrystalReportProduct cr = new CrystalReportProduct();
    cr.SetDataSource(db.Students.Select(p => new
    {
        sno = p.sno,
        name =p.sname,
        phone=p.phone,
        email = p.email,
        course = p.course,
        date=p.date,
        paymentmode=p.paymentMode,
        amount=p.amount

    }));

    this.CrystalReportViewerProduct.ReportSource = cr;
    this.CrystalReportViewerProduct.DataBind();

Answer 1

使用OrderByDescending(p => p.sno)按sno排序，然后Take(1)：

cr.SetDataSource(db.Students.Select(p => new
{
    sno = p.sno,
    name =p.sname,
    phone=p.phone,
    email = p.email,
    course = p.course,
    date=p.date,
    paymentmode=p.paymentMode,
    amount=p.amount

}).OrderByDescending(p => p.sno).Take(1));