如何将字典列表转换为 IDictionary “C#”

Question

有一个query

的回答

我正在尝试了解将什么放入此 LINQ 段

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

我的确切列表定义是这样的：

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

这是我尝试过的，但它被标记为构建错误：

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

如前所述，我只是想了解如何正确定义 LINQ 部分以成功构建：

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

你也可以试试这样：

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，并将生成的序列与您字典中的所有元素一起展平为一个序列，因此，调用该方法的结果是 IEnumerable<KeyValuePair<string, StockDetails>>。然后你可以调用 ToDictionary 方法，就像你之前 quote 的答案一样，目的是将结果序列转换为 Dictionary<string,StockDetails>.

如何将字典列表转换为 IDictionary “C#”

How to convert a list of dictionaries into IDictionary “C#”

c#

linq

idictionary