Question

我有两个列表，我必须从中获取两个值（MyCaption和MyValue）。

List<UserInfoModel> userInfo = new List<UserInfoModel>();

List<myuser_field> myUserFields = GetMyUserFields();
var otherUserFields = otherUserService.GetOtherUserFields();

userInfo = (from otherUserField in otherUserFields
               where otherUserField.Chosen == true 
                    select new UserInfoModel {
                        MyCaption = otherUserField.FieldAlias,
                        MyValue =
                    }).ToList();

MyCaption我直接从其中一个列表中获取。现在要获取MyValue，我需要根据otherUserField.FieldName找到。即我必须找到myUserFields.FieldName，它等于otherUserField.FieldName并将其分配给MyValue。

可以在单个查询中完成，如上所述吗？请建议

Answer 1

userInfo = (from myUserField in myUserFields
            join otherUserField in otherUserFields
            on myUserField.FieldName == otherUserField.FieldName
            where otherUserField.Chosen == true 
            select new UserInfoModel {
                MyCaption = otherUserField.FieldAlias,
                MyValue = myUserField.FieldName
            }).ToList();

Answer 2

根据您的问题，您不想清楚要分配给MyValue。

以下将分配myuser_field对象，该对象的FieldName与当前枚举的myuser_object（otherUserField.FieldName）的FieldName匹配：

List<UserInfoModel> userInfo = new List<UserInfoModel>(); 

List<myuser_field> myUserFields = GetMyUserFields(); 
var otherUserFields = otherUserService.GetOtherUserFields(); 

userInfo = (from otherUserField in otherUserFields 
               where otherUserField.Chosen == true  
                    select new UserInfoModel { 
                        MyCaption = otherUserField.FieldAlias,
                        MyValue = myUserFields.Single(uf => uf.FieldName == otherUserField.FieldName)
                    }).ToList();

Linq子查询在查询中

2 个答案: