C# dictionaries ValueOrNull / ValueorDefault

var x = dict.ContainsKey(key) ? dict[key] : defaultValue

var x =  dict[key] ?? defaultValue;

public static class MyHelper
{
    public static V GetValueOrDefault<K, V>(this Dictionary<K, V> dic, K key, V defaultVal)
    {
        V ret;
        bool found = dic.TryGetValue(key, out ret);
        if (found) { return ret; }
        return defaultVal;
    }
    void Example()
    {
        var dict = new Dictionary<int, string>();
        dict.GetValueOrDefault(42, "default");
    }
}

public abstract class MyHelper {
    public static V GetValueOrDefault<K,V>( Dictionary<K,V> dic, K key ) {
        V ret;
        bool found = dic.TryGetValue( key, out ret );
        if ( found ) { return ret; }
        return default(V);
    }
}

var x = MyHelper.GetValueOrDefault( dic, key );