C# 如何修复“无法将类型Generic.IEnumerable隐式转换为”Generic.List“的错误消息

C# 如何修复“无法将类型Generic.IEnumerable隐式转换为”Generic.List“的错误消息,c#,asp.net,linq,list,generics,C#,Asp.net,Linq,List,Generics,为什么我会收到此错误消息: 无法将类型“System.Collections.Generic.IEnumerable”隐式转换为“System.Collections.Generic.List” 构建此代码时: List<BALHotelList> searchresult=from a in bh join b in hr on a.HotelCode equals b.hotelCode orderby a.Hot

为什么我会收到此错误消息:

无法将类型“System.Collections.Generic.IEnumerable”隐式转换为“System.Collections.Generic.List”

构建此代码时:

 List<BALHotelList> searchresult=from a in bh
                join b in hr on a.HotelCode equals b.hotelCode
                orderby a.HotelName
                select new BALHotelList
                    {
                       HotelCode= a.HotelCode,
                       ImageURL_Text = a.ImageURL_Text,
                       HotelName = a.HotelName,
                       StarRating = a.StarRating,
                       HotelAddress = a.HotelAddress,
                       Destination = a.Destination,
                       Country = a.Country,
                       HotelInfo = a.HotelInfo,
                       Latitude = a.Latitude,
                       Longitude = a.Longitude,
                       totalPrice = b.totalPrice,
                       totalPriceSpecified = b.totalPriceSpecified,
                       totalSalePrice = b.totalSalePrice,
                       totalSalePriceSpecified = b.totalSalePriceSpecified,
                       rooms = b.rooms

                    };

LINQ语句返回的类型是IEnumerable,而不是List

如果你真的必须把它列为一个列表,那么把整个列表放在一个。。。。选择新的xxx{};然后先打电话给ToList查询结果


否则执行var searchresult=。。。。您仍然可以在searchresult变量上使用foreach。

您可能只需要用括号将linq括起来,然后调用。ToList on the result:

List<BALHotelList> searchresult= (from a in bh
            join b in hr on a.HotelCode equals b.hotelCode
            orderby a.HotelName
            select new BALHotelList
                {
                   HotelCode= a.HotelCode,
                   ImageURL_Text = a.ImageURL_Text,
                   HotelName = a.HotelName,
                   StarRating = a.StarRating,
                   HotelAddress = a.HotelAddress,
                   Destination = a.Destination,
                   Country = a.Country,
                   HotelInfo = a.HotelInfo,
                   Latitude = a.Latitude,
                   Longitude = a.Longitude,
                   totalPrice = b.totalPrice,
                   totalPriceSpecified = b.totalPriceSpecified,
                   totalSalePrice = b.totalSalePrice,
                   totalSalePriceSpecified = b.totalSalePriceSpecified,
                   rooms = b.rooms

                }).Tolist();

如果您想要一个列表,您需要将Linq查询用括号括起来,并调用.ToList.

为什么不使用var searchresult=呢?因为var范围仅限于该方法。这很重要吗?那就在这条路的尽头扔一个。托利斯特query@rahularyansharma当var用于匿名类型时,匿名类型不能离开该方法。对于真正的类型,var只是键入完整类型名的语法糖。var仅限于作用域,我想将其用作globallyRight,所以按照我所说的,在生成的IEnumerable上显式调用ToList