1 using System;
2 using System.Linq;
3
4 namespace Linq101
5 {
6 class Conversion
7 {
8 /// <summary>
9 /// This sample uses ToArray to immediately evaluate a sequence into an array.
10 /// </summary>
11 public void Linq54()
12 {
13 double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };
14
15 //var doublesArray = doubles.OrderByDescending(d => d).ToArray();
16 var sortedDoubles = from d in doubles
17 orderby d descending
18 select d;
19 var doublesArray = sortedDoubles.ToArray();
20
21 Console.WriteLine("Every other double from highest to lowest:");
22 for (int d = 0; d < doublesArray.Length; d += 2)
23 {
24 Console.WriteLine(doublesArray[d]);
25 }
26 }
27
28 /// <summary>
29 /// This sample uses ToList to immediately evaluate a sequence into a List<T>.
30 /// </summary>
31 public void Linq55()
32 {
33 string[] words = { "cherry", "apple", "blueberry" };
34
35 //var wordList = words.OrderBy(w => w).ToList();
36 var sortedWords =
37 from w in words
38 orderby w
39 select w;
40 var wordList = sortedWords.ToList();
41
42 Console.WriteLine("The sorted word list:");
43 foreach (var w in wordList)
44 {
45 Console.WriteLine(w);
46 }
47 }
48
49 /// <summary>
50 /// This sample uses ToDictionary to immediately evaluate a sequence and a related key expression into a dictionary.
51 /// </summary>
52 public void Linq56()
53 {
54 var scoreRecords = new[] { new {Name = "Alice", Score = 50},
55 new {Name = "Bob" , Score = 40},
56 new {Name = "Cathy", Score = 45}
57 };
58
59 var scoreRecordsDict = scoreRecords.ToDictionary(s => s.Name);
60
61 Console.WriteLine("Bob' Score: {0}", scoreRecordsDict["Bob"].Score);
62 }
63
64 /// <summary>
65 /// This sample uses OfType to return only the elements of the array that are of type double.
66 /// </summary>
67 public void Linq57()
68 {
69 object[] numbers = { null, 1.0, "two", 3, "four", 5, "six", 7.0 };
70
71 var doubles = numbers.OfType<double>();
72
73 Console.WriteLine("Numbers stored as doubles:");
74 foreach (var d in doubles)
75 {
76 Console.WriteLine(d);
77 }
78 }
79 }
80 }
