将动态类型转换为列表

Question

I am using the Facebook C# SDK to get data. I want to use parallel.foreach but cannot use it - instead, an error occurs:

Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type

So is there any way I can convert data retrieved to a list?

dynamic friends = app.Get("me/friends");   
Parallel.ForEach(friends.data, friendsData =>
    {
        Interlocked.Increment(ref infoCount);
        LoadFriends(friend, infoCount);
    });

Answer 1

If you can't use a lambda expression, have you tried an anonymous method?

dynamic friends = app.Get("me/friends");   
    Parallel.ForEach(friends.data, delegate(dynamic friendsData)
       {
           Interlocked.Increment(ref infoCount);
           LoadFriends(friend, infoCount);

       });

Answer 2

I used the following code to convert the JsonArray to a Dictionary of id as a key and names as value

var friendlist = (friends.data as Facebook.JsonArray).ToDictionary( 
                p => (p as Facebook.JsonObject)["id"].ToString(), 
                p => (p as Facebook.JsonObject)["name"].ToString());

Parallel.ForEach(friendlist, friend
       {
           Interlocked.Increment(ref infoCount);
           LoadFriends(friend, infoCount);
       }