Question

的答案

我正在尝试了解要放入此LINQ段的内容

pair => pair.Key, pair => pair.Value

我的确切列表定义是：

List<Dictionary<string, StockDetails>> myList = new List<Dictionary<string, StockDetails>>();

这是我尝试的但它被标记为构建错误：

IDictionary<string, StockDetails> dictionary = myList.ToDictionary(myList => myList.Key, pair => myList.Value);

如上所述，我只是想了解如何正确定义它以成功构建的LINQ部分：

myList => myList.Key, pair => myList.Value);

我的构建错误是

Error   7   'System.Collections.Generic.Dictionary<string,xx.Models.StockDetails>' does not contain a definition for 'Key' and no extension method 'Key' accepting a first argument of type 'System.Collections.Generic.Dictionary<string,xx.Models.StockTickerDetails>' could be found (are you missing a using directive or an assembly reference?)

    xxxx    
Error   9   'System.Collections.Generic.List<System.Collections.Generic.Dictionary<string,xx.Models.StockTickerDetails>>' does not contain a definition for 'Value' and no extension method 'Value' accepting a first argument of type 'System.Collections.Generic.List<System.Collections.Generic.Dictionary<string,xx.Models.StockDetails>>' 
could be found (are you missing a using directive or an assembly reference?)

感谢您的帮助

Answer 1

你也可以尝试这样的事情：

IDictionary<string, StockDetails> result = myList.SelectMany(d => d).ToDictionary(e=>e.Key,e=>e.Value);

SelectMany会将每个字典投影为一个序列，它会将结果序列展平为一个序列，其中包含字典中的所有元素，因此调用该方法的结果为{{1 }}。然后，您可以调用IEnumerable<KeyValuePair<string, StockDetails>>方法，就像之前quote的答案一样，打算在ToDictionary中转换结果序列。

如何将字典列表转换为IDictionary“C＃”

1 个答案: