通过反射创建 F# 记录 [英] Creating F# record through reflection

问题描述

如何使用反射在 F# 中创建记录类型?谢谢

How can I create a record type in F# by using reflection? Thanks

推荐答案

您可以使用 FSharpValue.MakeRecord^[MSDN] 来创建记录实例，但我认为 F# 中没有任何用于定义记录类型的东西.但是，记录会编译为简单的类，因此您可以像在 C# 中一样构建一个类.TypeBuilder^[MSDN] 可能是一个很好的起点.

You can use FSharpValue.MakeRecord^[MSDN] to create a record instance, but I don't think there's anything baked into F# for defining record types. However, records compile to simple classes, so you could build a class as you would in C#. TypeBuilder^[MSDN] may be a good starting point.

将 [] 添加到类型是使其成为记录所需的全部内容.下面是如何在运行时执行此操作的示例.

Adding [<CompilationMapping(SourceConstructFlags.RecordType)>] to the type is all that's required to make it a record. Here's an example of how to do this at run-time.

let asmName = AssemblyName("Foo")
let asm = AppDomain.CurrentDomain.DefineDynamicAssembly(asmName, AssemblyBuilderAccess.RunAndCollect)
let moduleBldr = asm.DefineDynamicModule("Test")
let typeBldr = moduleBldr.DefineType("MyRecord", TypeAttributes.Public)
let attrBldr = CustomAttributeBuilder(
                typeof<CompilationMappingAttribute>.GetConstructor([|typeof<SourceConstructFlags>|]), 
                [|box SourceConstructFlags.RecordType|])
typeBldr.SetCustomAttribute(attrBldr)
let typ = typeBldr.CreateType()
printfn "%b" <| FSharpType.IsRecord(typ) //true

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