[英]How to implement a C# interface in F#?
我想在F#中实现以下C#接口:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Mono.Addins;
[TypeExtensionPoint]
public interface ISparqlCommand
{
string Name { get; }
object Run(Dictionary<string, string> NamespacesDictionary, org.openrdf.repository.Repository repository, params object[] argsRest);
}
这是我尝试过的方法,但是它给了我:“在表达式的这一点或之前不完整的结构化构造”
#light
module Module1
open System
open System.Collections.Generic;
type MyClass() =
interface ISparqlCommand with
member this.Name =
"Finding the path between two tops in the Graph"
member this.Run(NamespacesDictionary, repository, argsRest) =
new System.Object
我究竟做错了什么? 也许缩进是错误的?
我在评论中验证了@Mark的答案。 给出以下C#代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace org.openrdf.repository {
public class Repository {
}
}
namespace CSLib
{
[System.AttributeUsage(System.AttributeTargets.Interface)]
public class TypeExtensionPoint : System.Attribute
{
public TypeExtensionPoint()
{
}
}
[TypeExtensionPoint]
public interface ISparqlCommand
{
string Name { get; }
object Run(Dictionary<string, string> NamespacesDictionary, org.openrdf.repository.Repository repository, params object[] argsRest);
}
}
以下F#实现(仅在对象构造处更改为add ()
)有效:
#light
module Module1
open System
open System.Collections.Generic;
open CSLib
type MyClass() =
interface ISparqlCommand with
member this.Name =
"Finding the path between two tops in the Graph"
member this.Run(NamespacesDictionary, repository, argsRest) =
new System.Object()
尽管您不再需要使用#light
(它是默认设置),并且您可能想要在NamespaceDictionary
参数名中添加#light
警告:“大写变量标识符通常不应在模式中使用,并且可能表示拼写错误的模式名称。” 还要注意,您需要将MyClass
ISparqlCommand
为ISparqlCommand
才能访问已实现的成员(不是您所问的问题,但很容易因C#而感到困惑):例如(MyClass() :> ISparqlCommand).Name
谢谢大家! 以下代码实际上有效:
namespace MyNamespace
open System
open System.Collections.Generic;
open Mono.Addins
[<assembly:Addin>]
do()
[<assembly:AddinDependency("TextEditor", "1.0")>]
do()
[<Extension>]
type MyClass() =
interface ISparqlCommand with
member this.Name
with get() =
"Finding the path between two tops in a Graph"
member this.Run(NamespacesDictionary, repository, argsRest) =
new System.Object()
这也是如何在F#中使用Mono.Addins的示例
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