如何直接从C#代码调用F#printfn
?我看到有一个
T PrintfModule.PrintFormat<T>(PrintfFormat<T, TextWriter, Unit,Unit> format)
例如,我有定义x
的F#程序集:
type R = { r: R }
let rec x = { r = x }
在另一个C#程序集中,如何通过调用与x
相当的printfn "%A" x
代码来打印PrintfModule.PrintFormatLine
?
我创建了F#文件Program.fs:
open System
type R = { r: R }
let rec x = { r = x }
[<EntryPoint>]
let main argv =
printfn "%A" x
0
编译它然后反编译为C#:
using Microsoft.FSharp.Core;
...
public static Program.R x {
get { return \u0024Program.x\u00406; }
}
[EntryPoint]
public static int main(string[] argv)
{
\u0024Program.init\u0040 = 0;
int init = \u0024Program.init\u0040;
ExtraTopLevelOperators
.PrintFormatLine<FSharpFunc<Program.R, Unit>>(
(PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit>)
new PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit, Program.R>("%A")).Invoke(Program.x);
return 0;
}
public sealed class R : IEquatable<Program.R>, IStructuralEquatable, IComparable<Program.R>, IComparable, IStructuralComparable
{
internal Program.R r\u0040;
public Program.R r { get { return this.r\u0040; } }
public R(Program.R r) { this.r\u0040 = r; }
}
希望它会给你一个提示如何做到这一点。
AlexAtNet的anwser的缩短版本是:
PrintfModule
.PrintFormatLine(
new PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit, Program.R>("%A"))
.Invoke(Program.x);
虽然我不明白为什么需要铸造(PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit>)
。如果有人知道原因,请教我。