查询包含一组指定词语的句子

 1 class FindSentences
 2 {
 3     static void Main()
 4     {
 5         string text = @"Historically, the world of data and the world of objects " +
 6         @"have not been well integrated. Programmers work in C# or Visual Basic " +
 7         @"and also in SQL or XQuery. On the one side are concepts such as classes, " +
 8         @"objects, fields, inheritance, and .NET Framework APIs. On the other side " +
 9         @"are tables, columns, rows, nodes, and separate languages for dealing with " +
10         @"them. Data types often require translation between the two worlds; there are " +
11         @"different standard functions. Because the object world has no notion of query, a " +
12         @"query can only be represented as a string without compile-time type checking or " +
13         @"IntelliSense support in the IDE. Transferring data from SQL tables or XML trees to " +
14         @"objects in memory is often tedious and error-prone.";
15 
16         // Split the text block into an array of sentences.
17         string[] sentences = text.Split(new char[] { '.', '?', '!' });
18 
19         // Define the search terms. This list could also be dynamically populated at runtime.
20         string[] wordsToMatch = { "Historically", "data", "integrated" };
21 
22         // Find sentences that contain all the terms in the wordsToMatch array.
23         // Note that the number of terms to match is not specified at compile time.
24         var sentenceQuery = from sentence in sentences
25                             let w = sentence.Split(new char[] { '.', '?', '!', ' ', ';', ':', ',' },
26                                                     StringSplitOptions.RemoveEmptyEntries)
27                             where w.Distinct().Intersect(wordsToMatch).Count() == wordsToMatch.Count()
28                             select sentence;
29 
30         // Execute the query. Note that you can explicitly type
31         // the iteration variable here even though sentenceQuery
32         // was implicitly typed. 
33         foreach (string str in sentenceQuery)
34         {
35             Console.WriteLine(str);
36         }
37 
38         // Keep the console window open in debug mode.
39         Console.WriteLine("Press any key to exit");
40         Console.ReadKey();
41     }
42 }
43 /* Output:
44 Historically, the world of data and the world of objects have not been well integrated
45 */