C# 如何将 LINQ 与动态集合一起使用
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How to use LINQ with dynamic collections
提问by
Is there a way to convert dynamicobject to IEnumerableType to filter collection with property.
有没有办法将dynamic对象转换为IEnumerableType 以过滤具有属性的集合。
dynamic data = JsonConvert.DeserializeObject(response.Content);
I need to access something like this
我需要访问这样的东西
var a = data.Where(p => p.verified == true)
Any Ideas?
有任何想法吗？
采纳答案by Jon Skeet
So long as datais an IEnumerableof some kind, you can use:
只要data是IEnumerable某种类型，您就可以使用：
var a = ((IEnumerable) data).Cast<dynamic>()
.Where(p => p.verified);
The Cast<dynamic>()is to end up with an IEnumerable<dynamic>so that the type of the parameter to the lambda expression is also dynamic.
的Cast<dynamic>()是最终要与IEnumerable<dynamic>使得参数lambda表达式的类型也是dynamic。
回答by Yaser Moradi
Try casting to IEnumerable<dynamic>
尝试投射到 IEnumerable<dynamic>
((IEnumerable<dynamic>)data).Where(d => d.Id == 1);
This approach is 4x faster than other approachs.
这种方法比其他方法快 4 倍。
good luck
祝你好运
回答by user3407039
If you are able to, the ideal solution is to specify the type when deserializing, so to avoid having to cast later. This is a lot cleaner than the approaches suggested above.
如果可以，理想的解决方案是在反序列化时指定类型，以避免以后必须强制转换。这比上面建议的方法要干净得多。
So if you have -
所以如果你有 -
dynamic data = JsonConvert.DeserializeObject(response.Content);
Then simply change this to -
然后只需将其更改为 -
var data = JsonConvert.DeserializeObject<IEnumerable<dynamic>>(response.Content);
