GridView实战二：使用ObjectDataSource数据源控件(自定义缓存机制实现Sort)

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　因为使用ObjectDataSource自带的缓存机制无法实现排序功能，苦苦寻觅终于找到了解决方案。参考后觉得还是自己实操一下比较安心，下面是对《GridView实战二：使用ObjectDataSource数据源控件》的改进！！

  CL代码：

1 public class CL

2 {

3     private OdsDataManager om = new OdsDataManager();

4     private static string[] mainKey = {"ods"};

5

6     public CL()

7     {

8     }

9

10     public DataTable GetRecord(int maximumRows, int startRowIndex, string sortExpression)

11     {

12         DataTable dt = HttpRuntime.Cache[GetCacheKey(Convert.ToString(maximumRows) + startRowIndex)] as DataTable;

13         if (dt == null)

14         {

15             dt = om.GetRecord(maximumRows, startRowIndex, sortExpression);

16             AddCache(Convert.ToString(maximumRows) + startRowIndex, dt);

17         }

18         if (!string.IsNullOrEmpty(sortExpression))

19         {

20             DataTable tempDt = dt.Clone();

21             DataRow[] drs = dt.Select("",sortExpression);

22             foreach (DataRow dr in drs)

23             {

24                 tempDt.Rows.Add(dr.ItemArray);

25             }

26             dt = tempDt;

27         }

28

29         return dt;

30     }

31

32     public int GetRecordCount()

33     {

34         return om.GetRecordCount();

35     }

36

37     public bool UpdateRecord(int ID, string Name, string Sex, string Country, string Hobby)

38     {

39         RemoveCache();

40         return om.UpdateRecord(ID,Name,Sex,Country,Hobby);

41     }

42

43     public bool DelRecord(int ID)

44     {

45         RemoveCache();

46         return om.DelRecord(ID);

47     }

48

49     public DataTable GetCountry()

50     {

51         DataTable countryDt = HttpRuntime.Cache["countryDt"] as DataTable;

52         return countryDt;

53     }

54

55     public DataTable GetHobby()

56     {

57         DataTable hobbyDt = HttpRuntime.Cache["hobbyDt"] as DataTable;

58         return hobbyDt;

59     }

60

61     private void AddCache(string key, object data)

62     {

63         System.Web.Caching.Cache dc = HttpRuntime.Cache;

64         if (dc[mainKey[0]] == null)

65             dc.Insert(mainKey[0], DateTime.Now);

66

67         System.Web.Caching.CacheDependency cd = new System.Web.Caching.CacheDependency(null, mainKey);

68         dc.Insert(GetCacheKey(key), data, cd, System.Web.Caching.Cache.NoAbsoluteExpiration, System.Web.Caching.Cache.NoSlidingExpiration);

69     }

70

71     private void RemoveCache()

72     {

73         System.Web.Caching.Cache dc = HttpRuntime.Cache;

74         if (dc[mainKey[0]] != null)

75             dc[mainKey[0]] = DateTime.Now;

76     }

77

78     private string GetCacheKey(string key)

79     {

80         return mainKey[0] + "-" + key;

81     }

82 }

实现预加载(proactive loading)

Global.asax

1     void Application_Start(object sender, EventArgs e)

2     {

3         // 在应用程序启动时运行的代码

4         OdsDataManager om = new OdsDataManager();

5         HttpRuntime.Cache.Insert("countryDt", om.GetCountry(), null,

6             System.Web.Caching.Cache.NoAbsoluteExpiration,

7             System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, null);

8         HttpRuntime.Cache.Insert("hobbyDt", om.GetHobby(), null,

9             System.Web.Caching.Cache.NoAbsoluteExpiration,

10             System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, null);

11         om = null;

12     }

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