[英]Call F# `printfn` from C#
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
F#程序集:
type R = { r: R }
let rec x = { r = x }
在另一个C#组件,我怎么能打印x
通过调用代码,相当于printfn "%A" x
与PrintfModule.PrintFormatLine
?
AlexAtNet的答案的简短版本是:
PrintfModule
.PrintFormatLine(
new PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit, Program.R>("%A"))
.Invoke(Program.x);
尽管我不明白为什么需要强制转换(PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit>)
。 如果有人知道原因,请教我。
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; }
}
希望它会提示您如何操作。
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