Linq "other thread running" error

Question

3.00/5 (1 vote)

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C#

public static bool DeleteAll()
        {
            try
            {
                Entities db = new Entities();
                IEnumerable<CMPS285_table_schedule> temp = (from p in db.CMPS285_table_schedule select p);
                foreach (CMPS285_table_schedule item in temp)
                {
                    db.DeleteObject(item);
                    db.SaveChanges();
                }
            }
            catch (Exception E)
            {
                Console.WriteLine(E);
            }
            
            return false;
        }

I am getting the error:

"New transaction is not allowed because there are other threads running in the session."

Need help.

Posted 11-Mar-12 8:08am

ahatteri

Updated 11-Mar-12 8:14am

André Kraak

v2

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André Kraak 11-Mar-12 14:14pm

Edited question:
Added pre tags

2 solutions

Solution 2

Just wanted to add how i fixed it.
items to delete or add should be passed as parameter/reference - in my case it was the problem. I passed an object to the delete method and tried to delete it - ERROR. then I created an object with same parameter and deleted it. HURRAY!!! the same method as above worked.

instead of Ieneurable bla blah var is preffered. I just dont know why but it works

Posted 28-Mar-12 12:28pm

ahatteri

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Dean Oliver · Accepted Answer · 2012-03-11T08:52:00

C#

public static bool DeleteAll()
        {
            try
            {
                using (Entities db = new Entities())
                {
                   var temp = (from p in db.CMPS285_table_schedule select p).ToList();
                   foreach (var item in temp)
                   {
                      db.DeleteObject(item);
                      db.SaveChanges();
                   }
                }
            }
            catch (Exception E)
            {
                Console.WriteLine(E);
            }
            
            return false;
        }

EF is still in the original transaction to retrieve all the data records in Table. So when we call .SaveChanges() to execute the SQL statements in another transaction, we receive the exception.

To workaround the issue, I would recommend you retrieve the results in one go before the foreach loop.

Also please take a look at this link below on deferred and immediate execution.
http://www.dotnetcurry.com/ShowArticle.aspx?ID=750[^]
Please vote and mark as solution thanks.