How to outer join 2 dynamic tables in LINQ C#

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I am using..

C#

var resultingTable1 = from t2 in DB1.AsEnumerable()
                      join t1 in dtresult.AsEnumerable().DefaultIfEmpty()
                      on new 
                      { 
                         LoginID = t2.Field<string>("Login ID"), 
                         reportdate = Convert.ToDateTime(t2.Field<string>("Login time")).Date.ToString() 
                      } 
                      equals new 
                      { 
                         LoginID = t1.Field<string>("LoginID"), 
                         reportdate = t1.Field<DateTime>("ReportDate").Date.ToString() 
                      }

                      select new { t2,t1 };

But getting result as inner join
C#

What I have tried:

C#

var resultingTable1 = from t2 in DB1.AsEnumerable()
                      join t1 in dtresult.AsEnumerable().DefaultIfEmpty()
                      on new { 
                               LoginID = t2.Field<string>("Login ID"), 
                               reportdate = Convert.ToDateTime(t2.Field<string>("Login time")).Date.ToString() 
                             } 
                      equals new { 
                                   LoginID = t1.Field<string>("LoginID"), 
                                   reportdate = t1.Field<DateTime>("ReportDate").Date.ToString() 
                                 }

Posted 15-Dec-16 0:36am

Member 11312264

Updated 15-Dec-16 0:58am

Ehsan Sajjad

v3

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Ehsan Sajjad · Accepted Answer · 2016-12-15T00:55:00

You are actually doing inner join so the result is right in that sense, for outer join you need to do it little different, you will have to to add a from clause as well after join like:

C#

var resultingTable1 = from t2 in DB1.AsEnumerable()
                      join t1 in dtresult.AsEnumerable()
                      on new 
                      { 
                         LoginID = t2.Field<string>("Login ID"), 
                         reportdate = Convert.ToDateTime(t2.Field<string>("Login time")).Date.ToString() 
                      } 
                      equals new 
                      { 
                         LoginID = t1.Field<string>("LoginID"), 
                         reportdate = t1.Field<DateTime>("ReportDate").Date.ToString() 
                      }
                       into joinResult
                       from t in joinResult.DefaultIfEmpty()

                      select new { t2,t };

Have a look at this post.