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如何将Func<>属性/方法传递给NancyFx Get()方法?

func nancy lambda c#

Xpleria Dholu · 技术社区 · 6 年前

南希(2。x) NancyModule.Get() 方法定义为:

public virtual void Get(string path, Func<dynamic, object> action, [Func<NancyContext, bool> condition = null], [string name = null]);

通常的用法是:

public class MyModule
{
    public MyModule() 
    {
        this.Get("/", parameters => {
            this.RequestHandler = new RequestHandler();

            return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
        });
    }
}

我想将第二个参数定义为一个属性,这样我就可以使用以下几种路径:

public class MyModule
{
    Func<dynamic, object> indexHandler = parameters => {
        // Error: Keyword "this" is not available in this context
        this.RequestHandler = new RequestHandler();

        // Error: Keyword "this" is not available in this context
        return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
    };

    public MyModule() 
    {
        this.Get("/", indexHandler);
        this.Get("/index", indexHandler);
    }
}

如果我这样做,它会起作用:

public class MyModule
{
    public MyModule() 
    {
        Func<dynamic, object> indexHandler = parameters => {
            this.RequestHandler = new RequestHandler();

            return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
        };

        this.Get("/", indexHandler);
        this.Get("/index", indexHandler);
    }
}

但我不想在构造函数中定义它。我做错什么了?还有别的办法吗?

MVCE公司

依赖包: 南希(版本:2.0.0-clinteastwood)

using Nancy;
using Nancy.Responses.Negotiation;

namespace MyNamespace
{
    public class MyModule : NancyModule
    {
        private RequestHandler RequestHandler;
        private object IndexHandler(dynamic parameters)
        {
            this.RequestHandler = new RequestHandler();
            var someOtherInfo = "";
            return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
        }

        public MyModule()
        {
            this.Get("/", IndexHandler);
            this.Get("/index", IndexHandler);

            this.Get("/home", parameters => {
                return this.Negotiate.WithView("myview.html");
            });
        }
    }

    public class RequestHandler
    {
        public Negotiator HandleRequest(string path, dynamic parameters, string someOtherInfo)
        {
            return new Negotiator(new NancyContext());
        }
    }
}

2 回复 | 直到 6 年前

Haytam 6 年前

安得烈的回答是有效的,应该已经足够了,但是显然(在MVCE中)方法定义不存在。

下面是正确的定义(至少是VS想要的定义):

public virtual void Get(string path, Func<object, Task<object>> action, Func<NancyContext, bool> condition = null, string name = null)

幸运的是你 HandleRequest 是可等待的,因此您只需要编辑返回类型。
以下是正确的定义:

private Task<object> IndexHandler(dynamic parameters)
{
    this.RequestHandler = new RequestHandler();
    var someOtherInfo = "";
    return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
}

希望这有帮助!

Andrei TÄtar 6 年前

这应该有效:

public class MyModule
{
    public MyModule() 
    {
       this.Get("/", IndexHandler);
       this.Get("/index", IndexHandler);
    }

    private object IndexHandler(dynamic parameters) {
        this.RequestHandler = new RequestHandler();
        return this.RequestHandler.HandleRequest("/", parameters, someOtherInfo);
    }
}