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

Question

There is this answer of a query

I am trying to understand what to put into this LINQ segment

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

My exact List definition is this:

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

This what I attempted but it got flagged for build errors:

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

As said, I am just trying to understand this LINQ part in how to properly define it for a successful build:

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

My build errors are

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?)

Thanks for any help

Answer 1

Also you could try something like this:

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

The SelectMany will project each dictionary as a sequence and it will flatten the resulting sequences into one sequence with all the elements that you have in your dictionaries, so, the result of calling that method is a IEnumerable<KeyValuePair<string, StockDetails>>. Then you can call the ToDictionary method like the answer that you quote before with the intention to convert the resulting sequence in a Dictionary<string,StockDetails>.