在查詢中的Linq子查詢

Question

我有兩個列表，我必須從中獲取兩個值（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我直接從列表中獲得一個。現在要獲取MyValue，我需要根據otherUserField.FieldName來查找。 即我必須找到myUserFields.FieldName，它等於otherUserField.FieldName並將其分配給MyValue。

可以在上面的單個查詢中完成嗎？請建議

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

從你的問題，它不是很清楚你想分配給MyValue。

下面將指派其具有當前列舉myuser_object的字段名相匹配（otherUserField.FieldName）一個字段名的myuser_field對象：

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();