将C#委托转换为TypeScript

时间:2012-11-30 14:01:20

标签: c# javascript typescript

您能告诉我如何将其翻译为TypeScript吗? 使用SharpKit.JavaScript;

namespace MyNamespace
{
    [JsType(JsMode.Prototype)]
    public class JsEventArgs
    {
    }

    public delegate void JsEventHandler<in T>(object sender, T args) where T : JsEventArgs;
    public delegate void JsEventHandler(object sender, JsEventArgs args);
}

在其他课程中使用:

public event JsEventHandler<LayerVisivilityEventArgs> Changed;

我试过了:

module JsEvent {

    export class JsEventArgs {
    }

    public JsEventHandler: (sender: Object, args: any) => void;
    public JsEventHandler: (sender: Object, args: JsEventArgs) => void;
}

3 个答案:

答案 0 :(得分:6)

我编写了一个类似于.NET Delegate类的小类(它是为.NET中的事件隐式创建的)

export interface IDelegate {
    (sender: any, ...parameters: any[]): void;
}

export class DelegateBuilder {
    private callees: IDelegate[];

    constructor() {
        this.callees = [];
    }

    invoke(sender: any, ...parameters: any[]) {
        for (var i = 0; i < this.callees.length; i++) {
            var callee = this.callees[i];
            if (caller)
                callee(sender, parameters);
        }
    }

    contains(callee: IDelegate) : bool {
        if (!callee)
            return false;

        return this.callees.indexOf(callee) >= 0;
    }

    add(callee: IDelegate): DelegateBuilder {
        if (!callee)
            return this;

        if (!this.contains(callee))
            this.callees.push(callee);

        return this;
    }

    remove(callee: IDelegate): DelegateBuilder {
        if (!callee)
            return this;

        var index = this.callees.indexOf(callee);
        if (index >= 0)
            this.callees.splice(index, 1);

        return this;
    }

    toDelegate() : IDelegate {
        return (sender: any, ...parameters: any[]) => this.invoke(sender, parameters);
    }
}

答案 1 :(得分:4)

我认为你需要停止在C#中思考,并开始在TypeScript中思考。

此代码:

module JsEvent {

    export class JsEventArgs {
    }

    public JsEventHandler: (sender: Object, args: any) => void;
    public JsEventHandler: (sender: Object, args: JsEventArgs) => void;
}

...尝试向模块添加两个属性,但只允许在类(或接口)上使用属性。

TypeScript并不真正使用委托 - 您可以连接一个事件(例如,在JQuery中),如下所示:

$('selector').click((e:JQueryEventObject) => {
     // Do something here.
});

......或者,避免使用JQuery:

var div: HTMLDivElement = new HTMLDivElement();
div.onclick = (e: MouseEvent) => {
    // Do something here.
};

......或者,没有匿名函数:

div.onclick = doSomething;
function doSomething(e:MouseEvent):void{
    // Do something here.
}

我认为你最接近代表的模式是这样的(来自http://forum.unity3d.com/threads/9679-Javascript-Delegates!):

module JSEvents {
    class JSEventClass {

        public delegate:(e:string) => any;

        constructor() => {
            this.delegate = this.doSomething;
            this.delegate("Hello, Delegate World");
        }

        public doSomething(e: string): any {
            console.log("Doing Something: " + e);
        }
    }
}

...但是在TypeScript / JavaScript世界中,我没有看到这种模式直接调用doSomething()所取得的成就。

答案 2 :(得分:0)

我认为这是对相关代码的密切翻译。但是,这并未涉及another answer已涵盖的事件处理。

module MyNamespace
{
    export class JsEventArgs
    {
    }

    export interface JsEventHandler<T extends JsEventArgs> {
        (sender: any, args: T): void;
    }

    export interface JsEventHandler {
        (sender: any, args: JsEventArgs): void;
    }
}