Question

对F＃来说很新。我有一个这样的课程

namespace FsharpTestSystem

open System
open System.IO
open System.Text
open System.Diagnostics

open System.CodeDom
open Microsoft.FSharp.Compiler.SourceCodeServices
open Microsoft.FSharp.Compiler.Interactive.Shell
open Microsoft.FSharp.Compiler.SimpleSourceCodeServices

type TestSystem() =
// Intialize output and input streams
// Build command line arguments & start FSI session

    let argv = [| "C:\\Program Files (x86)\\Microsoft SDKs\\F#\\4.1\\Framework\\v4.0\\fsi.exe" |]
    let allArgs = Array.append argv [|"--noninteractive"|]

    let sbOut = new StringBuilder()
    let sbErr = new StringBuilder()
    let inStream = new StringReader("")
    let outStream = new StringWriter(sbOut)
    let errStream = new StringWriter(sbErr)
    let fsiConfig = FsiEvaluationSession.GetDefaultConfiguration() 


....

我在这个类中添加了一个成员方法（函数）。但是，如何将返回值分配给类的成员变量，以便其他成员可以看到？换句话说，fsis

的其他成员需要使用TestSystem

在C＃中，这是微不足道的，例如通过使用属性。我怀疑我需要告诉F＃系统fsis在声明它时会以某种方式变异。

member this.LoadFSI() =
    fsis = FsiEvaluationSession.Create(fsiConfig, allArgs, inStream, outStream, errStream)

member this.UseFSI() =
     //I need to use fsis in here.

Answer 1

你确实生活在最前沿......这个怎么样：

type TestSystem()  =
    // ....
    [<DefaultValue>] val mutable Fsis : FsiEvaluationSession
    member __.LoadFsis() = __.Fsis <- FsiEvaluationSession.Create(fsiConfig, allArgs, inStream, outStream, errStream)
    member __.UseFsis() = __.Fsis.GetHashCode()


let ts = TestSystem()
ts.LoadFsis()
ts.UseFsis()
ts.Fsis.GetHashCode()
ts.LoadFsis()
ts.UseFsis()

从哈希码（我假设）中你可以看到，只要你不做.LoadFsis它就是使用相同的会话。我相信这可以做得更漂亮。

如何从成员函数分配给类的成员变量

1 个答案: