Question

原谅我对此的无知。我有这个LINQ查询： Dim ngBikersDataContext As New CarBikeWalkDataContext

bikersList = (From c In ngBikersDataContext.Reg_Bikers _
                        Order By c.L_Name _
                        Select New Bikers() With { _
                        .BikerID = c.BikerID, _
                        .F_Name = c.F_Name, _
                        .M_Name = c.M_Name, _
                        .L_Name = c.L_Name _
                        }).ToList()

你可以看到它是一个列表（OF）。以下是bikersList的定义：

Dim bikersList As List(Of Bikers) = TryCast(HttpContext.Current.Session("Bikers"), List(Of Bikers))

我需要能够排序，所以打算使用Dynamic LINQ Library。所以我将它添加到我的项目Imported System.Linq.Dynamic并尝试使用此代码：

bikersList = (ngBikersDataContext.Reg_Bikers _
                    .OrderBy(SortExpression) _
                    .Select New Bikers() With { _
                        .BikerID = c.BikerID, _
                        .F_Name = c.F_Name, _
                        .M_Name = c.M_Name, _
                        .L_Name = c.L_Name _
                        }).ToList()

但现在我得到了蓝色的scwiggly线：

                    ngBikersDataContext.Reg_Bikers _
                    .OrderBy(SortExpression) _
                    .Select

错误“重载解析失败，因为无法访问'选择'接受此数量的参数。” 超过“新”我得到一个错误“'）'预期。”

有人请告诉我我做错了什么。谢谢

Answer 1

您将'扩展方法'语法与'查询语法'混合在一起。

bikersList = (ngBikersDataContext.Reg_Bikers _
                .OrderBy(SortExpression) _
                .Select(Function(c) New Bikers() With { _
                    .BikerID = c.BikerID, _
                    .F_Name = c.F_Name, _
                    .M_Name = c.M_Name, _
                    .L_Name = c.L_Name _
                    })).ToList()

或者

bikersList = (From c in ngBikersDataContext.Reg_Bikers.OrderBy(SortExpression) _
              Select b = New Bikers() With { _
                    .BikerID = c.BikerID, _
                    .F_Name = c.F_Name, _
                    .M_Name = c.M_Name, _
                    .L_Name = c.L_Name _
                    }).ToList()

需要使用Dynamic LINQ Library的LINQ Query帮助

1 个答案: