真的令人困惑的错误：类型'屏幕'不是'功能结果'类型'屏幕'的子类型 [英] Really confusing error: type 'Screen' is not a subtype of type 'Screen' of 'function result'

问题描述

我在写一个Dart应用程序，我得到的错误：

 类型'屏幕'不是一个子类型键入功能结果的屏幕。 
  

我真的不知道实际的错误是什么？

我的代码如下：

 类CanvasManager {
 Map< String，Screen& _canvases = new Map< String，Screen>（）; 
 CanvasManager（Map< String，CanvasElement> reqCanvas，int sizeX，int sizeY，bool fullscreen）{
 reqCanvas.forEach（（k，v）{
 _canvases [k] create（v，sizeX，sizeY，fullscreen）; 
}）; 
} 
屏幕getCanvas（String c）{
 if（_canvases.containsKey（c））{
 return _canvases [c]; 
} 
 else throw没有这样的画布与键$ {c}; 
} 
} 
  

由于某种原因，错误。

只是为了注释屏幕是我也创建了一个类。因为我完全不知道，我不知道它是否会帮助你通过给你这个类。它有点长，所以我会粘贴bin： http://pastebin.com/KvZ54yPe

解决方案

修复了它！

屏幕已经是dart：html中的类名。编译器真的应该告诉你，如果你已经重用了一个类名称与某种警告，但它不。

Hi I am writing a Dart app and I am getting the error:

type 'Screen' is not a subtype of type 'Screen' of 'function result'.

I have literally no idea what the actual error is?

My code is as follows:

class CanvasManager {
  Map<String, Screen> _canvases = new Map<String, Screen>();
  CanvasManager (Map<String, CanvasElement> reqCanvas, int sizeX, int sizeY, bool fullscreen) {
    reqCanvas.forEach((k,v) {
      _canvases[k] = new Screen.create(v, sizeX, sizeY, fullscreen);
    });
  }
  Screen getCanvas(String c) {
    if (_canvases.containsKey(c)) {
    return _canvases[c];
    }
    else throw "No such canvas with key ${c}";
  }
}

For some reason when I instance that class I get the error.

Just to note Screen is a class I have also created. As I'm completely baffeled I don't know if it will help you by giving you that class as well. It's somewhat long so I will paste-bin it: http://pastebin.com/KvZ54yPe

解决方案

Fixed it!

Screen is already a class name in dart:html. The compiler really should tell you if you have reused a class name with some sort of warning but it doesn't.

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