public static TResult CachedExpression<TSource, TArg1, TArg2, TArg3, TArg4, TResult>(
    this IQueryable<TSource> source,
    Func<IQueryable<TSource>, TArg1, TArg2, TArg3, TArg4, TResult> f,
    TArg1 a1,
    TArg2 a2,
    TArg3 a3,
    TArg4 a4
)

<ExtensionAttribute>
Public Shared Function CachedExpression(Of TSource, TArg1, TArg2, TArg3, TArg4, TResult)(
    source As IQueryable(Of TSource),
    f As Func(Of IQueryable(Of TSource), TArg1, TArg2, TArg3, TArg4, TResult),
    a1 As TArg1,
    a2 As TArg2,
    a3 As TArg3,
    a4 As TArg4
) As TResult