Question

I am confused which data type to define for my variable which stores value returned by LINQ Statement.

Currently I am defining it as some data type but its generating error like: ""Unable to cast object of type 'WhereSelectListIterator2″”`

Sample Code:

Private BaseRateList = List (of BaseCat)
Private myBase As BaseCat = Nothing

'''In some other proc
myBase = From BaseRate In BaseRateList _
         Where BaseRate.UIN = 4 _
         Select BaseRate

Here i want myBase to hold the data which has UIN = 4

Answer 1

It sounds like you just want a single value. The options you probably want to consider are:

• Single
• SingleOrDefault
• First
• FirstOrDefault

e.g.

myBase = (From BaseRate In BaseRateList _
          Where BaseRate.UIN = 4 _
          Select BaseRate).Single()

… depending on how you want it to behave if there are 0 or multiple matching values.

Or using the overload of Single (etc) which takes a predicate:

myBase = BaseRateList.Single(Function(baseRate) baseRate.UIN = 4)