[英]Call F# `printfn` from C#
如何直接從C#代碼調用F# printfn
? 我看到有一個
T PrintfModule.PrintFormat<T>(PrintfFormat<T, TextWriter, Unit,Unit> format)
例如,我有定義x
F#程序集:
type R = { r: R }
let rec x = { r = x }
在另一個C#組件,我怎么能打印x
通過調用代碼,相當於printfn "%A" x
與PrintfModule.PrintFormatLine
?
AlexAtNet的答案的簡短版本是:
PrintfModule
.PrintFormatLine(
new PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit, Program.R>("%A"))
.Invoke(Program.x);
盡管我不明白為什么需要強制轉換(PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit>)
。 如果有人知道原因,請教我。
我創建了F#文件Program.fs:
open System
type R = { r: R }
let rec x = { r = x }
[<EntryPoint>]
let main argv =
printfn "%A" x
0
編譯它,然后反編譯為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; }
}
希望它會提示您如何操作。
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