Step by step build your own paging control-2

 

In the previous article, I wrote the paging code in the user control. After careful consideration, I found that paging is nothing more than changing the current page number and getting different data.

Therefore, the click pagination event is the same, so I thought of using the delegate to bind multiple similar events and optimize the code above.

Front-end code

 

 

1 <div id = "pager">

2 page <asp: Label ID = "curPage" runat = "server" Text = "1"> </asp: Label> & nbsp;

3 <asp: LinkButton ID = "lbtfirst" runat = "server" onclick = "lbtfirst_Click"> homepage </asp: LinkButton> & nbsp;

4 <asp: LinkButton ID = "lbtPre" runat = "server" onclick = "lbtPre_Click"> previous page </asp: LinkButton> & nbsp;

5 <asp: LinkButton

6 ID = "lbtNext" runat = "server" onclick = "lbtNext_Click"> next page </asp: LinkButton> & nbsp;

7 <asp: LinkButton ID = "lblLast"

8 runat = "server" onclick = "lblLast_Click"> last page </asp: LinkButton> & nbsp;

9 </div>

The paging code in the background does not implement paging, data sources are not set, and control parameters are bound to Data.

 

 

1 using System;

2

3 namespace Pager. controls

4 {

5 public delegate void pageChangedHandler (object sender, int nPageIndex );

6 public partial class pager3: System. Web. UI. UserControl

7 {

8 public event pageChangedHandler OnPageChange;

9 protected void Page_Load (object sender, EventArgs e)

10 {

11 if (! IsPostBack)

12 {

13 state ();

14}

15}

16 # region attributes

17

18 int pageCount = 10;

19 /// <summary>

20 // Number of pages per page

21 /// </summary>

22 public int PageCount

23 {

24 get {return pageCount ;}

25 set {pageCount = value ;}

26}

27 int pagelist = 1;

28 /// <summary>

29 // page number

30 /// </summary>

31 public int Pagelist

32 {

33 get {return pagelist ;}

34 set {pagelist = value ;}

35}

36

37 private void state ()

38 {

39 if (this. curPage. Text = "1 ")

40 {

41 lbtfirst. Enabled = false;

42 lbtPre. Enabled = false;

43 lbtNext. Enabled = true;

44 lblLast. Enabled = true;

45}

46 if (int. Parse (this. curPage. Text)> 1 & int. Parse (this. curPage. Text) <Pagelist)

47 {

48 lbtfirst. Enabled = true;

49 lbtPre. Enabled = true;

50 lbtNext. Enabled = true;

51 lblLast. Enabled = true;

52}

53 if (int. Parse (this. curPage. Text) = Pagelist)

54 {

55 lbtfirst. Enabled = true;

56 lbtPre. Enabled = true;

57 lbtNext. Enabled = false;

58 lblLast. Enabled = false;

59}

60}

61

62 # endregion

63

64 # region click Page events

65 // page 1

66 protected void lbtfirst_Click (object sender, EventArgs e)

67 {

68 this. curPage. Text = "1 ";

69 OnPageChange (sender, 1 );

70 state ();

71}

72 // Previous Page

73 protected void lbtPre_Click (object sender, EventArgs e)

74 {

75 this. curPage. Text = (int. Parse (this. curPage. Text)-1). ToString ();

76 OnPageChange (sender, int. Parse (this. curPage. Text ));

77 state ();

78}

79 // next page

80 protected void lbtNext_Click (object sender, EventArgs e)

81 {

82

83 this. curPage. Text = (int. Parse (this. curPage. Text) + 1). ToString ();

84 OnPageChange (sender, int. Parse (this. curPage. Text ));

85 state ();

86}

87 // last page

88 protected void lblLast_Click (object sender, EventArgs e)

89 {

90 this. curPage. Text = Pagelist. ToString ();

91 OnPageChange (sender, int. Parse (this. curPage. Text ));

92 state ();

93}

94 # endregion

95}

96}

You only need to trigger a paging event to obtain the dynamically changed current page number.

 

 

1 protected void Page_Load (object sender, EventArgs e)

2 {

3 showData (1 );

4 this. pager31.OnPageChange + = new controls. pageChangedHandler (pager31_PageIndexChanged );

5}

6 void pager31_PageIndexChanged (object sender, int nPageIndex)

7 {

8 showData (nPageIndex );

9}

10 www.2cto.com

11 private void showData (int nPageIndex)

12 {

13 pager31.PageCount = 20;

14 pager31.Pagelist = (new sqlHelper (). getAllPage ()/pager31.PageCount;

15 this. GridView1.DataSource = new sqlHelper (). getList (pager31.PageCount, nPageIndex-1 ,"");

16 this. GridView1.DataBind ();

17}

The code will continue to be downloaded in the next article. I am sorry to keep you waiting.

 

Author: meteor sword