关于c＃：如何使用LINQ在Class中展平嵌套词典

How to flatten nested dictionaries within Class using LINQ

最接近我所寻找的解决方案是这个线程如何用LINQ表达式扁平嵌套对象

但是我在尝试这种方法时出错了

The type arguments for method 'System.Linq.Enumerable.SelectMany(System.Collections.Generic.IEnumerable, System.Func>)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

我的代码：

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var aa = t.data.SelectMany(x =>
x.Value.innerData.SelectMany(y => new { /*Error at this SelectMany*/
url = x.Key,
disp = x.Value.disp,
date = y.Key,
count = y.Value.count,
rank = y.Value.rank,
}));

我的班级：

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public class TData {
public Dictionary<string, TDetail> data { get; set; }
}

public class TDetail {
public string disp { get; set; }

[Newtonsoft.Json.JsonProperty("data")]
public Dictionary<string, Metrics> innerData { get; set; }

}

public class Metrics {
public string count { get; set; }
public string rank { get; set; }
}

我从第三方API获得的JSON如下所示：

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{
"data": {
"abc.com": {
"disp":"#712176",
"data": {
"2015-02-08": {
"count": 4,
"rank": 5.8
},
"2015-02-23": {
"count": 3,
"rank": 8.3
},
"2015-03-14": {
"count": 5,
"rank": 3.7
}
}
},
"nbc.com": {
"disp":"#822176",
"data": {
"2015-02-08": {
"count": 3,
"rank": 5.5
},
"2015-02-23": {
"count": 5,
"rank": 8.4
},
"2015-03-14": {
"count": 7,
"rank": 4.7
}
}
}
}
}

在这种情况下，如何显式指定类型参数？谢谢。

SelectMany太多：

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var t = new TData(); // your TData

var aa = t.data.SelectMany(x =>
x.Value.innerData.Select(y => new
{
url = x.Key,
disp = x.Value.disp,
date = y.Key,
count = y.Value.count,
rank = y.Value.rank,
}));

内部必须是一个Select。