如何在F＃中使用Span？

Question

I try to add reference to System.Memory by

#r "C:/Program Files/dotnet/shared/Microsoft.NETCore.App/2.1.5/System.Memory.dll"

But F# interactive still says The value or constructor 'Span' is not defined . And When I try to use open System.Memory it says The namespace 'Memory' is not defined . Is there a way to do this?

Answer 1

You don't need to open System.Memory but you do need to open System . You might also want to nuget System.Memory into a .NET framework application first, and then reference it. I wonder though how FSI will interact with Span<T> .

#if INTERACTIVE
#r @"C:\Users\username\Documents\Source\ConsoleApplication1\packages\System.Memory.4.5.1\lib\netstandard2.0\System.Memory.dll"
#r "System.Runtime.dll"
#endif


open System
open System.Runtime.CompilerServices

[<IsByRefLike; Struct>]
type S(count1: Span<int>, count2: Span<int>) =
    member x.Count1 = count1
    member x.Count2 = count2