[英]Invoking an F# library from C#
I have an F# class library that is consumed by C#.我有一个 C# 使用的 F# class 库。
The F# library has 2 two types and one simple function that I want to invoke from my C# code. F# 库有两种类型和一种简单的 function,我想从我的 C# 代码中调用它。
namespace HFNZ.InfectionStatus.ClassLibrary命名空间 HFNZ.InfectionStatus.ClassLibrary
type Result =
| Positive
| Negative
type TestType =
| AntiHBc of Option<Result>
| AntiHBs of Option<Result>
| HBeAg of Option<Result>
| HBsAg of Option<Result>
| HBVDNA of Option<Result>
module Program =
let getHVBStatus (test1, test2, test3, test4, test5) =
match test1 test2 test3 test4 test5 with
| AntiHBc (Some(Positive)),
AntiHBs (Some(Positive)),
HBeAg (Some(Positive)),
HBsAg (Some(Positive)),
HBVDNA (Some(Positive)) -> "Normal"
| _ -> "Elevated"
This is my C# code:这是我的 C# 代码:
var positive = new FSharpOption<Result>(Result.Positive);
var antiHBc = TestType.NewAntiHBc(positive);
var AntiHBs = TestType.NewAntiHBs(positive);
var HBeAg = TestType.NewHBeAg(positive);
var HBsAg = TestType.NewHBsAg(positive);
var HBVDNA = TestType.NewHBVDNA(positive);
Program.getHVBStatus(antiHBc, AntiHBs, HBeAg, HBsAg, HBVDNA);
The C# code does not compile due to this error:由于此错误,C# 代码无法编译:
Severity Code Description Project File Line Suppression State
Error CS1503 Argument 1: cannot convert from 'InfectionStatus.ClassLibrary.TestType' to 'Microsoft.FSharp.Core.FSharpFunc<InfectionStatus.ClassLibrary.TestType, Microsoft.FSharp.Core.FSharpFunc<InfectionStatus.ClassLibrary.TestType, Microsoft.FSharp.Core.FSharpFunc<InfectionStatus.ClassLibrary.TestType, Microsoft.FSharp.Core.FSharpFunc<InfectionStatus.ClassLibrary.TestType, System.Tuple<InfectionStatus.ClassLibrary.TestType, InfectionStatus.ClassLibrary.TestType, InfectionStatus.ClassLibrary.TestType, InfectionStatus.ClassLibrary.TestType, InfectionStatus.ClassLibrary.TestType>>>>>' UnitTestProject1 D:\F#\Code\InfectionStatus.ClassLibrary\UnitTestProject1\UnitTest1.cs 21 Active
I tried changing the F# function to use tuples instead of currying but still getting a compilation error.我尝试将 F# function 更改为使用元组而不是currying,但仍然出现编译错误。
What is the correct way to pass multiple arguments (non-primitive types) from C# to F#?将多个 arguments(非原始类型)从 C# 传递到 F# 的正确方法是什么?
In your F# function getHVBStatus
, you are missing commas between the parameters that you want to pattern match agains (on the match
line).在您的 F# function
getHVBStatus
中,您想要再次进行模式匹配的参数之间缺少逗号(在match
行上)。 As a result, the F# type inference turns test1
into a function that takes test2
and all the other parameters as arguments.结果,F# 类型推理将
test1
转换为 function,它将test2
和所有其他参数作为 arguments。
This is quite hard to spot just from the C# compiler error message, but if you hover over test1
to see the inferred type in F#, you'll immediately see that there's something wrong.仅从 C# 编译器错误消息中很难发现这一点,但如果您在
test1
上查看 hover 以查看 F# 中的推断类型,您会立即看到有问题。 Adding commas on the match
line should fix the problem:在
match
行上添加逗号应该可以解决问题:
let getHVBStatus (test1, test2, test3, test4, test5) =
match test1, test2, test3, test4, test5 with
| AntiHBc (Some(Positive)),
AntiHBs (Some(Positive)),
HBeAg (Some(Positive)),
HBsAg (Some(Positive)),
HBVDNA (Some(Positive)) -> "Normal"
| _ -> "Elevated"
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