public static TResult CachedExpression<TSource, TArg1, TArg2, TResult>(
    this IQueryable<TSource> source,
    Func<IQueryable<TSource>, TArg1, TArg2, TResult> f,
    TArg1 a1,
    TArg2 a2
)

<ExtensionAttribute>
Public Shared Function CachedExpression(Of TSource, TArg1, TArg2, TResult)(
    source As IQueryable(Of TSource),
    f As Func(Of IQueryable(Of TSource), TArg1, TArg2, TResult),
    a1 As TArg1,
    a2 As TArg2
) As TResult