adelarsq / FSharp.Interop.Dynamic

DLR interop for F# -- works like dynamic keyword in C#

FSharp.Interop.Dynamic

The F# Dynamic Operator, powered by the DLR. Compiled for .NET Standard 2.0, .NET Standard 1.6, .NET Framework 4.5

Install from NuGet

PM> Install-Package FSharp.Interop.Dynamic

Build Status

Platform	Status
Nuget Deployment
Mac/Linux/Windows
Coverage

Bleeding edge feed on MyGet

Usage

target?Property, target?Property<-value, and target?Method(arg,arg2) allow you to dynamically get/set properties and call methods

Also Dyn.implicitConvert,Dyn.explicitConvert, comparison operators and more.

Examples:

System.Dynamic

open FSharp.Interop.Dynamic
let ex1 = ExpandoObject()
ex1?Test<-"Hi"//Set Dynamic Property
ex1?Test //Get Dynamic

MVC ViewBag

x.ViewBag?Name<-"George"

Dynamitey

open FSharp.Interop.Dynamic
open Dynamitey.DynamicObjects

let ComBinder = LateType("System.Dynamic.ComBinder, System.Dynamic, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")

let getPropertyNames (target:obj) =
  seq {
    yield! target.GetType().GetTypeInfo().GetProperties().Select(fun it -> it.Name)
    if (ComBinder.IsAvailable) then
      yield! ComBinder?GetDynamicDataMemberNames(target)
  }

Python Interop

Translated from this example C# code: https://github.com/SciSharp/pythonnet#example

open Python.Runtime
open FSharp.Interop.Dynamic
open FSharp.Interop.Dynamic.Operators

do
  use __ = Py.GIL()

  let math = Py.Import("numpy")
  np?cos(np?pi ?*? 2)
  |> printfn "%O"

  let sin: obj -> obj = np?sin
  sin 5 |> printfn "%O"

  np?cos 5 ?+? sin 5
  |> printfn "%O"

  let a: obj = np?array([| 1.; 2.; 3. |])
  printfn "%O" a?dtype

  let b: obj = np?array([| 6.; 5.; 4. |], Dyn.namedArg "dtype" np?int32)
  printfn "%O" b?dtype

  a ?*? b
  |> printfn "%O"

Output

1.0
-0.9589242746631385
-0.6752620891999122
float64
int32
[ 6. 10. 12.]

SignalR (.net framework version)

open FSharp.Interop.Dynamic
type MyHub =
    inherit Hub
    member x.Send (name : string) (message : string) =
        base.Clients.All?addMessage(name,message) |> ignore

Caveats:

The DLR is incompatible with interface explicit members, so are these operators, just like C#'s dynamic keyword.

.NET Core 2.0.0 to 2.0.2 had a major bug in the C# dynamic keyword with nested classes inside of generic classes.. You will know it from a substring argument length exception. .NET Framework 4.0+, .NET Core 1.x and .NET Core 2.0.3+ and later are unaffected.

Maintainer(s)

• @jbtule
• @forki

The default maintainer account for projects under "fsprojects" is @fsprojectsgit - F# Community Project Incubation Space (repo management)