通过LINQ在C＃中的类的数据成员查询字典

Question

I am working on C# Win 7.

I need to get a query from a dictionary.

Dictionary<string, myClass> myDict;

public class myClass
{
   public int myId;
   public Dictionary<string, Dictionary<string, string[]>> Dict1;
}

var query = from myStr in myDict group by myStr.value.myId into g select g;

I got error:

Cannot convert lambda expression to type keyValuePair becasue it is not a delegate type.

Any help would be appreciated.

Answer 1

var query = from myStr in myDict 
            group myStr by myStr.Value.myId into g // you missed myStr here
            select g;

That is required by syntax of query expressions (C# Specification 7.16):

 group-clause: group expression by expression