c# - 如何使用 linq 使用 hibernate queryover 连接两列

Question

我想在 select 子句中连接员工的名字和姓氏，但它给出了:

Could not determine member from new <>f__AnonymousType0`1(name = Format("{0} {1}", x.FirstName, x.LastName))

var returnData = UnitOfWork.CurrentSession.QueryOver<Employee>()
                 .OrderBy(x => x.Id).Asc
                 .SelectList(u => u.Select(x => x.Id).WithAlias(() => 
                                           businessSectorItem.id)
                                   .Select(x => new { name = string.Format("{0} {1}",
                                                x.FirstName, x.LastName) })
                                                .WithAlias(() => businessSectorItem.text))
                                   .Where(x => (x.FirstName.IsInsensitiveLike
                                                  ("%" + searchTerm + "%") ||
                                                x.LastName.IsInsensitiveLike
                                                  ("%" + searchTerm + "%")) &&
                                                  ( x.Account == null || x.Account.Id ==
                                                                           accountId))
                                  .TransformUsing(Transformers
                                                  .AliasToBean<SearchEmployeeItemDto>())
                                  .Take(limit)
                                  .List<SearchEmployeeItemDto>();

Answer 1

QueryOver 语法如下所示:

// instead of this
.Select(x => new { name = string.Format("{0} {1}",
     x.FirstName, x.LastName) })
     .WithAlias(() => businessSectorItem.text))                                   

// we should use this
.Select(
    Projections.SqlFunction("concat", 
        NHibernateUtil.String,
        Projections.Property<Employee>(e => e.FirstName),
        Projections.Constant(" "),
        Projections.Property<Employee>(e => e.LastName)
    )).WithAlias(() => businessSectorItem.text)

我们从 SQL 函数 concat 中获益。我们将 Projections.SqlFunction 传递到 Select() 语句中，并使用一些默认/基本的 Projections

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