F# lambda (quotation) to C# Expression<Func<_>> or Expression<Action<_>>

lambda.fs

open Microsoft.FSharp.Linq.RuntimeHelpers
open System
open System.Linq.Expressions

module Lambda =
    let toExpression (``f# lambda`` : Quotations.Expr<'a>) =
        ``f# lambda``
        |> LeafExpressionConverter.QuotationToExpression 
        |> unbox<Expression<'a>>

let test = 
    <@ Func<int, int>(fun i -> i + 5) @> |> Lambda.toExpression