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CHAPTER 27 LINQ TO OBJECTS
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Result item Result item Result item Result item Result item Result item Press enter to
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Length: 9, FirstChar: p Length: 5, FirstChar: l Length: Length: Length: Length: finish 4, 7, 9, 6, FirstChar: FirstChar: FirstChar: FirstChar: l c p o
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Anonymous types are very useful, but you cannot pass them as parameters to other methods. See the following section for a related example that shows you how to use the select clause to create a project a new object, the results from which can be passed to other methods.
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Projecting Derived Data
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You can project any data you like into the results, including data that you have derived from a characteristic of a data item. Listing 27-12 provides a demonstration that projects bool values. Listing 27-12. Projecting Derived Data using System; using System.Collections.Generic; using System.Linq; class Listing 12 { static void Main(string[] args) { List<string> myFruitList = new List<string>() { "apple", "plum", "cherry", "grape", "banana", "pear", "mango" , "persimmon", "lemon", "lime", "coconut", "pineapple", "orange"}; IEnumerable<bool> results = from e in myFruitList select e.Length > 5; foreach (bool item in results) { Console.WriteLine("Result item: {0}", item); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The select clause in this query projects true if the number of characters in the value assigned to the range variable is greater than 5 and false otherwise. Compiling and running Listing 27-12 produces the following results:
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CHAPTER 27 LINQ TO OBJECTS
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Result item: False Result item: False Result item: True Result item: False Result item: True Result item: False Result item: False Result item: True Result item: False Result item: False Result item: True Result item: True Result item: True Press enter to finish You can also project new objects, as demonstrated by Listing 27-13, which uses characteristics of the value assigned to the range value to create a new object that is projected into the results. Listing 27-13. Projecting a New Object using System; using System.Collections.Generic; using System.Linq; class NameInfo { public NameInfo(char charParam, int lenParam) { FirstChar = charParam; Length = lenParam; } public char FirstChar { get; set; } public int Length { get; set; } } class Listing 12 { static void Main(string[] args) { List<string> myFruitList = new List<string>() { "apple", "plum", "cherry", "grape", "banana", "pear", "mango" , "persimmon", "lemon", "lime", "coconut", "pineapple", "orange"}; IEnumerable<NameInfo> results = from e in myFruitList select new NameInfo(e[0], e.Length); foreach (NameInfo item in results) { Console.WriteLine("Result item - FirstChar: {0}, Length: {1}", item.FirstChar, item.Length);
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CHAPTER 27 LINQ TO OBJECTS
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} // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The select clause in Listing 27-13 creates and projects NameInfo objects. This example may appear similar to using anonymous types but has the advantage of allowing you to pass the query results as parameters to other methods, which you can t do when you use anonymous types. Compiling and running Listing 27-13 produces the following results: Result item Result item Result item Result item Result item Result item Result item Result item Result item Result item Result item Result item Result item Press enter - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: - FirstChar: to finish a, p, c, g, b, p, m, p, l, l, c, p, o, Length: Length: Length: Length: Length: Length: Length: Length: Length: Length: Length: Length: Length: 5 4 6 5 6 4 5 9 5 4 7 9 6
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Ordering Data
You can order data using the orderby clause. Listing 27-14 shows how this can be done. Listing 27-14. Ordering Data using System; using System.Collections.Generic; using System.Linq; class Listing 14 { static void Main(string[] args) { List<string> myFruitList = new List<string>() { "apple", "plum", "cherry", "grape", "banana", "pear", "mango" , "persimmon", "lemon", "lime", "coconut", "pineapple", "orange"}; IEnumerable<string> results = from e in myFruitList orderby e[0] select e;
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