LINQ Conversion Operators (ToArray,ToList,ToDictionary,OfType)

ToArray
This sample uses ToArray to immediately evaluate a sequence into an array.

static void Main(string[] args)
{
           double[] doubles = { 2.2, 1.3, 2.0, 4.1, 2.3 };

            var sortedDoubles =
                from d in doubles
                orderby d descending
                select d;
            var doublesArray = sortedDoubles.ToArray();

            Console.WriteLine("Every other double from highest to lowest:");
            for (int d = 0; d < doublesArray.Length; d += 2)
            {
                Console.WriteLine(doublesArray[d]);
            }
            Console.ReadKey(true);
}

Output


ToList
This sample uses ToList to immediately evaluate a sequence into a List<T>.

static void Main(string[] args)
{
            string[] words = { "cherry", "banana", "apple", "blueberry", "watermelon", "grape" };

            var sortedWords =
                from w in words
                orderby w
                select w;
            var wordList = sortedWords.ToList();

            Console.WriteLine("The sorted word list:");
            foreach (var w in wordList)
            {
                Console.WriteLine(w);
            }
            Console.ReadKey(true);
}

Output


ToDictionary
This sample uses ToDictionary to immediately evaluate a sequence and a related key expression into a dictionary.

static void Main(string[] args)
{
            var scoreRecords = new[] { new {Name = "Parthiv Patel", Score = 40},
                                new {Name = "Sachin Tendulkar"  , Score = 100},
                                new {Name = "Yuvraj Singh", Score = 70}
                            };

            var scoreRecordsDict = scoreRecords.ToDictionary(sr => sr.Name);

            Console.WriteLine("IPL's score: {0}", scoreRecordsDict["Sachin Tendulkar"]);

            Console.ReadKey(true);
}

Output


OfType
This sample uses OfType to return only the elements of the array that are of type double.

static void Main(string[] args)
{
            object[] numbers = { null, 1.0, "two", 3, "four", 5, "six", 7.0 ,8.0};

            var doubles = numbers.OfType<double>();

            Console.WriteLine("Numbers stored as doubles:");
            foreach (var d in doubles)
            {
                Console.WriteLine(d);
            }
            Console.ReadKey(true);
}

Output