LINQ subquery IN

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星月不相逢
星月不相逢 2021-01-02 15:01

I\'m a newbie with the IQueryable, lambda expressions, and LINQ in general. I would like to put a subquery in a where clause like this :

Sample code :



        
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4条回答
  • 2021-01-02 15:38

    Same example with Linq method syntax:

    var innerquery =  dbcontext.DataDictVal                  
                     .where(x=> x.TbiTableName == myTableNameVariable
                        && x.DdColumnName == "Status"
                        && x.DdbColumnValLangDsc1.StartsWith("ac"))
                     .select(x=>x.DdvColumnVal)
    
    var query = dbcontext.Client
                .where( c=>innerquery.Contains(c.Etat))
    

    Note:

    Am providing this answer, because when i searched for the answer, i couldn’t find much answer which explains same concept in the method syntax.

    So In future, It may be useful for the people, those who intestinally searched method syntax like me today. Thanks karthik

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  • 2021-01-02 15:45

    If you are new to Linq, you absolutely need two essential tools. The first is a tool that converts most T-SQL statements to Linq called Linqer (http://www.sqltolinq.com/). This should take care of the query in your question. The other tool is LinqPad (http://www.linqpad.net/). This will help you learn Linq as you practice with queries.

    I often use Linqer to convert a T-SQL query for me, and then use LinqPad to fine tune it.

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  • 2021-01-02 15:48
    from c in db.Client
    where (from d in db.DataDictVal 
           where d.TblTableName == "Client" 
             && d.DDColumnName == "Status"
             && dd.DdvColumnValLandDsc1.StartsWith("ac"))
           .Contains(c.Etat)
    select c;
    
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  • 2021-01-02 15:55
    var innerquery = from x in context.DataDictVal
                     where x.TbiTableName == myTableNameVariable
                        && x.DdColumnName == "Status"
                        && x.DdbColumnValLangDsc1.StartsWith("ac")
                     select x.DdvColumnVal;
    
    var query = from c in context.Client
                where innerquery.Contains(c.Etat)
                select c;
    
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