C # Sort data by key-value pairs,

C # Sort data by key-value pairs,

Summarize the sorting methods of key-value pairs.

 

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1. /* Use the sort dictionary. By default, only the ascending order is supported.
2. SortedDictionary <DateTime, String> dd = new SortedDictionary <DateTime, String> ();
3. DateTime dt = DateTime. Now;
4. Dd. Add (dt, "bbb ");
5. Dd. Add (dt. AddDays (-1), "ccc ");
6. Dd. Add (dt. AddDays (1), "aaa ");
7. // You can use List to obtain the descending key or value.
8. List <String> lst = new List <String> (dd. Values );
9. Lst. Reverse ();
10. */
12. /* Query using Linq
13. Dictionary <DateTime, String> dd = new Dictionary <DateTime, String> ();
14. DateTime dt = DateTime. Now;
15. Dd. Add (dt, "bbb ");
16. Dd. Add (dt. AddDays (-1), "ccc ");
17. Dd. Add (dt. AddDays (1), "aaa ");
18.  
19. Var result = from pair in dd orderby pair. Key descending select pair;
20. List <String> lst = new List <String> ();
21. Foreach (var kv in result)
22. {
23. Lst. Add (kv. Value );
24. }
25. // Or
26. Dictionary <DateTime, String> dd2 = result. ToDictionary (p => p. Key, p => p. Value );
27. */
29. // Use the Extension Method
30. Dictionary <DateTime, String> dd = new Dictionary <DateTime, String> ();
31. DateTime dt = DateTime. Now;
32. Dd. Add (dt, "bbb ");
33. Dd. Add (dt. AddDays (-1), "ccc ");
34. Dd. Add (dt. AddDays (1), "aaa ");
36. Dictionary <DateTime, String> dicAsc = dd. OrderBy (p => p. Key). ToDictionary (p => p. Key, p => p. Value );
37. Dictionary <DateTime, String> dicDesc = dd. OrderByDescending (p => p. Key). ToDictionary (p => p. Key, p => p. Value );