一个linq语句，其中包含多个group by列，不允许使用thenby

Question

I am some what new to LINQ so please cut me some slack.

I have a LINQ statement that I have grouped multiple columns on. Depending on the search it ranks every record with how much it matches the search.

• 1 pt. for First Letter of First Name
• 2 pts. for First 2 Letters of the First Name
• 4 pts for First Name Matching
• 8 pts. for Last Name Matching

So the First Order By is That. I then want a Thenby statement to order by FirstName

var ResultsListOrdered = from O in ResultsList
                                         group O by new
                                         {
                                             O.FirstName,
                                             O.LastName,
                                             O.SSN,
                                             O.Email,
                                             O.Phone
                                         } into g
                                         orderby g.Max().ResultMatch descending
                                         thenby g.Key.FirstName ascending
                                         select new SearchResultViewModel
                                         {
                                             ID = g.Max().ID,
                                             FirstName = ti.ToTitleCase(g.Key.FirstName.ToLower()),
                                             LastName = ti.ToTitleCase(g.Key.LastName.ToLower()),
                                             SSN = g.Key.SSN,
                                             Email = g.Key.Email.ToLower(),
                                             Phone = g.Key.Phone,
                                             ResultMatch = g.Max().ResultMatch
                                         };`

if LINQ statement works if you take out the thenby line. But as soon as you put it in it does not work.

This should work. Any help would be great

here is the error that it shows me when I hover over it

OK I AM ADDING THIS HERE FOR THE COMMENTS BELOW BECAUSE I CAN'T ADD IMAGE TO COMMENT

Answer 1

thenby isn't a valid keyword, use orderby g.Max().ResultMatch descending, g.Key.FirstName ascending .

You can see an explanation in the ThenBy operator:

In query expression syntax, an orderby [first criterion], [second criterion] (Visual C#) or Order By [first criterion], [second criterion] (Visual Basic) clause translates to an invocation of ThenBy.

Answer 2

I don't believe you can use thenby in this fashion its not an Keyword but extension method. In order to do what you are looking to do you would need to do this.

orderby g.Max().ResultMatch descending, g.Key.FirstName ascending

Answer 3

当使用查询语法，你用逗号分隔您的多个排序键，而不是thenby 。