在 Visual Studio 2015 和 2017 中,我正在 FSharp Interactive 中的几个 F# 示例中尝试 Http 类,我不断得到:
错误 FS0039:命名空间或模块“Http”未定义
这是示例:
open FSharp.Data
let response = Http.RequestString("http://api.themoviedb.org/3/search/movie", silentHttpErrors = true)
这显然是由于 FSharp.Data 的版本。有没有办法为 FSharp Interactive 指定正确的版本?什么版本的 FSharp.Data 包含 Http 模块?
根据评论,我整理了一个脚本来安装 Paket,对其进行初始化,然后在脚本运行时可选择安装依赖项。
/// install.paket.fsx
open System
open System.IO
printfn "Initialising..."
Environment.CurrentDirectory <- __SOURCE_DIRECTORY__
// invisibly run a command (paket.exe in this case)
let init paket =
let psi = new System.Diagnostics.ProcessStartInfo(paket)
psi.Arguments <- "init"
psi.UseShellExecute <- false
let p = System.Diagnostics.Process.Start(psi)
p.WaitForExit()
p.ExitCode
if not (File.Exists "paket.exe") then
printfn "installing paket"
let url = "http://fsprojects.github.io/Paket/stable"
use wc = new Net.WebClient()
let tmp = Path.GetTempFileName()
let stable = wc.DownloadString(url)
wc.DownloadFile(stable, tmp)
File.Move(tmp,Path.GetFileName stable)
printfn "paket installed"
System.Threading.Thread.Sleep(100)
printfn "initialising paket"
init "paket.exe" |> ignore
System.Threading.Thread.Sleep(200)
printfn "paket initialised"
else
printfn "paket already exists"
/// install.dependencies.fsx
open System.IO
printfn "Installing dependencies"
System.Environment.CurrentDirectory <- __SOURCE_DIRECTORY__
#r "paket.exe"
open Paket
let dependencies = Paket.Dependencies.Locate(__SOURCE_DIRECTORY__)
printfn "%s" dependencies.DependenciesFile
if not (File.Exists "packages/Newtonsoft.Json/lib/net40/Newtonsoft.Json.dll") then
printfn "installing nuget depenencies"
// either use the dependencies.Install to add dependencies in the paket.dependencies file
//dependencies.Install true |> ignore
// or install them by name
// I remove the existing versions
dependencies.Remove "FSharp.Data"
dependencies.Remove "Newtonsoft.Json 8.0.3"
// then add them (because I'm pedantic about the way the dependencies file looks)
dependencies.Add "FSharp.Data"
dependencies.Add "Newtonsoft.Json 8.0.3"
printfn "nuget depenencies installed"
else
printfn "nuget depenencies already exist"
printfn "Dependencies installed"
注意 Newtonsoft.Json 使用 8.0.3,最新版本带来了 20 多个额外的依赖项,所以我找到了一个很好的旧版本,它非常独立。如果你想要最新的,你可以留下版本号。
然后,我在共享的 utilities.fsx 中使用这些脚本来实现可重用的功能
System.Environment.CurrentDirectory <- __SOURCE_DIRECTORY__
#load "install.paket.fsx"
#load "install.dependencies.fsx"
#r "packages/fsharp.data/lib/net40/fsharp.data.dll"
#r "packages/Newtonsoft.Json/lib/net40/Newtonsoft.Json.dll"
open FSharp.Data
open FSharp.Data.HtmlAttribute
open FSharp.Data.HtmlNode
open FSharp.Data.HttpRequestHeaders
open Newtonsoft.Json
open System.Net
open System.IO
// utilities like authentication, Http requests and JSON (de)serialization
最后,我通过加载实用程序在我的目标脚本中引用了所有内容:
System.Environment.CurrentDirectory <- __SOURCE_DIRECTORY__
#load "utilities.fsx"
open Utilities
负责所有的依赖关系。这些可以使用
Alt
+ Enter
组合键从 Visual Studio 运行,或者使用 fsi.exe MyScript.fsx
从命令行运行