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LINQ的ForEach on HashSet？(LINQ's ForEach on HashSet?)

 我很好奇什么样的限制使得设计决定没有HashSet能够使用LINQ的ForEach查询。 
 

 这两种实现幕后的实际情况有什么不同： 
 

var myHashSet = new HashSet<T>;
foreach( var item in myHashSet ) { do.Stuff(); }

 

 VS 
 

var myHashSet = new HashSet<T>;
myHashSet.ForEach( item => do.Stuff(); }

 

 我（很漂亮）确定这只是因为HashSet没有实现IEnumerable - 但是正常的ForEach循环做了什么不同的事情，使得它更受HashSet支持？ 
 

 谢谢 

I am curious as to what restrictions necessitated the design decision to not have HashSet's be able to use LINQ's ForEach query.
 

What's really going on differently behind the scenes for these two implementations:
 

var myHashSet = new HashSet<T>;
foreach( var item in myHashSet ) { do.Stuff(); }

 

vs 
 

var myHashSet = new HashSet<T>;
myHashSet.ForEach( item => do.Stuff(); }

 

I'm (pretty) sure that this is just because HashSet does not implement IEnumerable -- but what is a normal ForEach loop doing differently that makes it more supported by a HashSet?
 

Thanks

原文：https://stackoverflow.com/questions/7983891
更新时间：2024-02-19 18:02

最满意答案

 我猜您正在使用Drive API V3并尝试在V3中调用V2版本的方法。 清楚地看一下文档，Drive API V2以下列格式返回响应{ "kind": "drive#fileList", "etag": etag, "selfLink": string, "nextPageToken": string, "nextLink": string, "items": [ files Resource ] }所以你可以在V2中执行$files->getItems() 。 但是Drive API V3以下列格式返回响应列表{ "kind": "drive#fileList", "nextPageToken": string, "files": [ files Resource ] }所以，你可能需要做一个$files->getFiles() 。 试一试 ！！ 我希望这会奏效。 供您参考Drive API V3列出响应 驱动API API列表响应 。 如果问题得到解决，请告诉我。 

I guess you are using Drive API V3 and trying to invoke a method of version V2 in V3 . Clearly look in the documentation , the Drive API V2 returns response in following format { "kind": "drive#fileList", "etag": etag, "selfLink": string, "nextPageToken": string, "nextLink": string, "items": [ files Resource ] } So you can do a $files->getItems() in V2 . But the Drive API V3 return response for listing in following format { "kind": "drive#fileList", "nextPageToken": string, "files": [ files Resource ] } So , you may need to do a $files->getFiles(). Give it a try !! I hope this will work . For your reference Drive API V3 Listing Response Drive API V2 Listing Response . Let me know if issue is resolved .

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