QueryableExtensionMethodsForDTOsOptionalWhereT Method

Part of LLBLGen Pro's functionality to project entity queries to generated DTO classes. Don't use this method in your own code. Extension method for enumerables in DTO projections which have been converted to queryables to append a where clause conditionally: if it's null, no call to Where is appended, otherwise a call to Where with the lambda provided is appended. This is done at evaluation time, hence this method's body isn't used as the call to this method is expected to be done inside a method which builds a projection.

public static IQueryable<T> OptionalWhere<T>(
	this IQueryable<T> source,
	Expression<Func<T, bool>> whereClause
)

<ExtensionAttribute>
Public Shared Function OptionalWhere(Of T) ( 
	source As IQueryable(Of T),
	whereClause As Expression(Of Func(Of T, Boolean))
) As IQueryable(Of T)