由于数据是数组，因此您无法访问from.name。

You cannot access from.name as you showed because the data is an array.

可以试试这个。

var fb = new FacebookApp("access_token");
dynamic result = fb.Get("/me/feed");

foreach (dynamic post in result.data)
{
    var fromName = post.from.name;
    Console.WriteLine(fromName);
}