LinQ LIKE运算符

Question

I need help with using a normal SQL LIKE %% operator within a LINQ query.

This is the data for row called Type (thats returned from the normal query without the like operator):

Independent Contractor
Lease Program 
Teams
Teams interested

And this is my (attempted) LINQ query:

Public Shared Function SelectActiveByState(
    ByVal state_abbr As String, 
    ByVal catagory As String) As List(Of theLocations)

    Dim db As New MasterData
    db.CommandTimeout = 240

    Try            
        Return ( _
            From hl In db.Locations _
            Where hl.Active = True _
            And ( _
                hl.State = state_abbr Or _
                hl.AlternateLocation.Contains(state_abbr) And _
                hl.Type.Contains("/" & catagory & "/") _
            ) _
            Order By hl.Type Select hl).ToList()

    Catch ex As Exception
        Return Nothing
    End Try
End Function

If i leave out the And hl.Type.Contains("/" & catagory & "/") the query works just fine (returns 4 records). But when i add that part it returns the same records regardless of my like operator.

Answer 1

Instead of

hl.Type.Contains("/" & catagory & "/")

try this:

SqlMethods.Like(hl.Type, "%"& category &"%") 

EDIT :

I am not good with VB.Net syntax.

EDIT:

Actually the result sql of your LINQ query becomes:

SELECT *
FROM   myTable
WHERE  State = state_abbr OR
       AlternateLocation LIKE state_abbr AND
       Type LIKE category

BUT you need this i guess:

SELECT *
FROM   myTable
WHERE  (State = state_abbr OR
       AlternateLocation LIKE state_abbr) AND
       Type LIKE category

Try this:

Return ( _ 
    From hl In db.Locations _ 
    Where hl.Active = True _ 
    And ( _ 
        (hl.State = state_abbr Or _ 
        hl.AlternateLocation.Contains(state_abbr)) And _ 
        SqlMethods.Like(hl.Type, "%"& category &"%") _ 
    ) _ 
    Order By hl.Type Select hl).ToList()

Answer 2

I figured it out using some of @Yaqub Ahmad code:

Public Shared Function SelectActiveByState(
    ByVal state_abbr As String, 
    ByVal catagory As String) As List(Of theLocations)

    Dim db As New MasterData
    db.CommandTimeout = 240

    Try            
        Return ( _
            From hl In db.Locations _
            Where hl.Active = True _
            And ( _
                (hl.State = state_abbr Or _
                hl.AlternateLocation.Contains(state_abbr)) And _
                System.Data.Linq.SqlClient.SqlMethods.Like(hl.Type, "%" & category & "%") _
            ) _
            Order By hl.Type Select hl).ToList()

    Catch ex As Exception
        Return Nothing
    End Try
End Function