C# ToDictionary get Anonymous Type value before C # 7

Hello here is how i get value from dictionary myage value after C# 7 

 static void Main(string[] args)
    {
        List<User> userlist = new List<User>();
        User a = new User();
        a.name = "a";
        a.surname = "asur";
        a.age = 19;

        User b = new User();
        b.name = "b";
        b.surname = "bsur";
        b.age = 20;

        userlist.Add(a);
        userlist.Add(b);

        var userlistdict = userlist.ToDictionary(x => x.name,x=> new {x.surname,x.age });

        if(userlistdict.TryGetValue("b", out var myage)) //myage

        Console.WriteLine(myage.age);

    }  
}
public class User {
    public string name { get; set; }
    public string surname { get; set; }
    public int age { get; set; }
}

Okey result is:20

But Before C# 7 how can i get myage value from dictionary. I could't find any other way.Just i found declare myage in trygetvalue method.

Jon Skeet
people
quotationmark

Three options:

First, you could write an extension method like this:

public static TValue GetValueOrDefault<TKey, TValue>(
    this IDictionary<TKey, TValue> dictionary,
    TKey key)
{
    TValue value;
    dictionary.TryGetValue(dictionary, out value);
    return value;
}

Then call it as:

var result = userlist.GetValueOrDefault("b");
if (result != null)
{
    ...
}

Second, you could use var with out by providing a dummy value:

var value = new { surname = "", age = 20 };
if (userlist.TryGetValue("b", out value))
{
    ...
}

Or as per comments:

var value = userlist.Values.FirstOrDefault();
if (userlist.TryGetValue("b", out value))
{
    ...
}

Third, you could use ContainsKey first:

if (userlist.ContainsKey("b"))
{
    var result = userlist["b"];
    ...
}

people

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