以下类型提供程序旨在创建
当我尝试像这样使用它时:
GeneratedNamespace.MyType
,它接受类型为 string
的静态参数并仅包含一个空构造函数。namespace TypeProviderTest
open Microsoft.FSharp.Core.CompilerServices
open ProviderImplementation.ProvidedTypes
open System.Reflection
open System
[<TypeProvider>]
type MyTypeProvider(config:TypeProviderConfig) as this =
inherit TypeProviderForNamespaces()
let namespaceName="GeneratedNamespace"
let assembly = Assembly.LoadFrom(config.RuntimeAssembly)
//Provides definition, based on type parameters
let instantiationFunction typeName (typeParams:obj[]) =
match typeParams with
| [|:? string as param|] ->
//Creates an empty non-erased type
let definition = ProvidedTypeDefinition(
assembly,
namespaceName,
typeName,
Some typedefof<Object>,
IsErased = false
)
//Creates an empty constructor
let emptyCtor = ProvidedConstructor (parameters = [])
//Provides a call to base constructor
//(https://dev59.com/533aa4cB1Zd3GeqPiMwv)
//Doesn't seem to help
let objCtor = typedefof<Object>.GetType().GetConstructor([||])
emptyCtor.BaseConstructorCall <- (fun _ -> objCtor,[])
emptyCtor.AddXmlDoc("Empty constructor test")
definition.AddMember(emptyCtor)
definition
| _ -> failwith "That was not supported"
let staticParams = [ProvidedStaticParameter("value",typedefof<string>)]
let t = ProvidedTypeDefinition(assembly,namespaceName,"MyType",Some typedefof<Object>)
do t.DefineStaticParameters(staticParams,instantiationFunction)
do this.AddNamespace(namespaceName,[t])
[<assembly:TypeProviderAssembly>]
do ()
当我尝试像这样使用它时:
open System
open GeneratedNamespace
type X = MyType<"Abacaba">
[<EntryPoint>]
let main argv =
printfn "%A %A" typedefof<X> (new X())
Console.ReadLine() |> ignore
0
这行代码type X = MyType<"Abacaba">
产生了错误
错误 FS3039: 不允许直接引用生成的类型'MyType'。
我添加了一个基础构造函数调用,但没有帮助
类型提供程序是有意生成的
我的类型提供程序有错误吗?
IsErased=false
即可。 - Tomas PetricekIsErased=false
”。我可以设置它,将InvokeCode = fun args -> <@@ obj() @@>
添加到emptyCtor
中,但是typedefof<X>
将成为Object
,而不是X
。我无法通过将它们标记为非生成来构建生成类型提供程序。 - user2136963