“X"类型的参数不能分配给“X"类型的参数 [英] Argument of type 'X' is not assignable to parameter of type 'X'

问题描述

美好的一天.我是 Type Script 的新手，使用 VSCode.

Good day. I'm new to Type Script, using VSCode.

出现以下错误:

错误 TS2322:类型 '() => string' 不可分配给类型 'string'.

error TS2322: Type '() => string' is not assignable to type 'string'.

错误 TS2322:类型 '() => number' 不能分配给类型 'number'.

error TS2322: Type '() => number' is not assignable to type 'number'.

代码:

DTO.ts

interface DTO {

    getId(): number;
    getValue(): string;
}
export = DTO;

LinkedObject.ts

class LinkedObject {

    public value: string = "Not Set";
    public id: number = 0;

    constructor(value?: string, id?: number) {
        this.value = value;
        this.id = id;
    }
}
export = LinkedObject;

我正在尝试使用上述接口方法实例化 LinkedObject 类:

I am trying to instantiate LinkedObject class using above mentioned interface methods:

TravelClientFormPopulator.ts

class TravelClientFormPopulator {

    public populateComboBoxUsingDTOs(dataObjects: Array<DTO>, comboBoxID: string): void {

        // Get the combo box
        var selectElement = <HTMLSelectElement> document.getElementById(comboBoxID);
        // Reset the options 
        selectElement.options.length = 0;

        var linkedObjectsToAdd: LinkedObject[] = new Array<LinkedObject>();

        var defaultLinkedObject: LinkedObject = new LinkedObject("Not Selected", 0);

        linkedObjectsToAdd.push(defaultLinkedObject);

        for (var i = 0; i < dataObjects.length; i++) {
            var value: string = dataObjects[i].getValue; // Error here
            var id: number = dataObjects[i].getId; // And here
            var linkedObject: LinkedObject = new LinkedObject(value, id);
        }
    }
}

任何帮助将不胜感激.

推荐答案

你错过了括号:

var value: string = dataObjects[i].getValue(); 
var id: number = dataObjects[i].getId();

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