Dynamic Like clause in LINQ How?

  • Thread starter Thread starter john
  • Start date Start date
J

john

I'm trying to build a LINQ expression that will use a dynamic construction
of a LIKE statement in the WHERE clause, it would look something like this
in SQL:

WHERE TaskGroup Like "*00*" OR TaskGroup Like "*20*"

It would be many variations on the above.



I know how use the LIKE clause in LINQ but not in this context, here is an
attempt that did not work, I also tried building it into a variable that
looked like the LINQ LIKE clause if I were to type it out (WHERE filterExp)
but it did not work either.



Thanks for any input



filterExp = ""

i = InStr(1, strFilter, ":")

Do Until i = 0

filterExp = filterExp & """Like *" & Mid(strFilter, i - 2, 2) &
"*"""

i = InStr(i + 1, strFilter, ":")

If i <> 0 Then

filterExp = filterExp + ", "

End If

Loop



Dim grp As String() = {filterExp}

Dim dbTask As New DataTaskDataContext

Dim taskTbl = From tas In dbTask.tblTasks _

Where grp.Contains(tas.TaskGroup) _

Select tas
 
Hi John,

As for LIKE syntax query, I've found some similar threads discussing on
this, and some of them're using a string comparing approach to do the LIKE
query in LINQ:

http://blogs.microsoft.co.il/blogs/bursteg/archive/2007/10/16/linq-to-sql-li
ke-operator.aspx

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1570290&SiteID=1

You may have a look to see whether it helps.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

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