.Net分页控件发布

最新推荐文章于 2025-08-22 11:57:24 发布

JOHNCOOLS

最新推荐文章于 2025-08-22 11:57:24 发布

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分类专栏： MS Asp.Net控件学习/资料文章标签： .net hyperlink string url datagrid assembly

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本文介绍了一款自定义的.NET分页控件，支持多种数据显示控件，包括DataGrid和DataList等，并具备URL分页功能，支持URL重写，方便搜索引擎抓取。此外，该控件还允许用户自定义样式。

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由于.net自带的分页功能极其死板，自定义性不强不能满足需求
俺花了一个多星期的时间写成的一个.net分页控件

特性:
1、支持datagrid,datalist等分种数据显示控件，理论上只要有datasource的控件都可以
2、支持url方式分页，url分页的每一页都可以被搜索引擎搜到，并且支持url重写
3、控件样式可自定义
4、封装完全，使用过程序只需写一行代码

如图：

  1 /* *****************************************************************
  2 ** 文件名:Pager.cs
  3 ** 创建人:杨响武
  4 ** 日期:2005年7月27日
  5 ** 修改人:
  6 ** 日期:
  7 ** 描述:
  8 **
  9 **----------------------------------------------------------------
10 ***************************************************************** */
11
12 using System;
13 using System.Web.UI.WebControls;
14 using System.Web.UI.HtmlControls;
15 using System.Web;
16 using System.Web.UI;
17 using System.Text.RegularExpressions;
18
19 namespace MyCompany.Controls
20 {
21      /// <summary>
22      /// 分页控件
23      /// </summary>
24      public class Pager : Label, INamingContainer
25     {
26          #region 成员变量和构造函数
27         HttpContext context = HttpContext.Current;
28         Label countLabel;
29         HyperLink previousButton;
30         HyperLink nextButton;
31         HyperLink firstButton;
32         HyperLink lastButton;
33         HyperLink[] pagingLinkButtons;
34
35          public override ControlCollection Controls
36         {
37              get
38             {
39                 EnsureChildControls();
40                  return base .Controls;
41             }
42         }
43
44          protected override void CreateChildControls()
45         {
46             Controls.Clear();
47
48             AddCountLabel();
49
50             AddPageButtons();
51
52             AddPreviousNextHyperLinks();
53
54             AddFirstLastHyperLinks();
55         }
56          #endregion
57
58          #region 呈现方法
59          protected override void Render(HtmlTextWriter writer)
60         {
61 //             修改总页数小于等于1的时候不呈现任何控件
62 //             int totalPages = CalculateTotalPages();
63 //
64 //             if (totalPages <= 1)
65 //                 return;
66
67             AddAttributesToRender(writer);
68
69             writer.AddAttribute(HtmlTextWriterAttribute.Class, this .CssClass, false );
70
71             RenderCountLabel(writer);
72
73             RenderFirst(writer);
74
75             RenderPrevious(writer);
76
77             RenderPagingButtons(writer);
78
79             RenderNext(writer);
80
81             RenderLast(writer);
82         }
83
84          void RenderCountLabel(HtmlTextWriter writer)
85         {
86             countLabel.RenderControl(writer);
87
88             LiteralControl l = new LiteralControl( "   " );
89             l.RenderControl(writer);
90         }
91
92          void RenderFirst (HtmlTextWriter writer)
93         {
94             firstButton.RenderControl(writer);
95
96             LiteralControl l = new LiteralControl( "   " );
97             l.RenderControl(writer);
98         }
99
100          void RenderLast (HtmlTextWriter writer)
101         {
102             lastButton.RenderControl(writer);
103
104             LiteralControl l = new LiteralControl( "   " );
105             l.RenderControl(writer);
106         }
107
108          void RenderPrevious (HtmlTextWriter writer)
109         {
110             previousButton.RenderControl(writer);
111
112             LiteralControl l = new LiteralControl( "   " );
113             l.RenderControl(writer);
114         }
115
116          void RenderNext(HtmlTextWriter writer)
117         {
118             nextButton.RenderControl(writer);
119
120             LiteralControl l = new LiteralControl( "   " );
121             l.RenderControl(writer);
122         }
123
124          private void RenderButtonRange( int start, int end, HtmlTextWriter writer)
125         {
126              for ( int i = start; i < end; i ++ )
127             {
128                  if (PageIndex == i)
129                 {
130                     Literal l = new Literal();
131                     l.Text = " <font color =red> " + (i + 1 ).ToString() + " </font> " ;
132
133                     l.RenderControl(writer);
134                 }
135                  else
136                 {
137                     pagingLinkButtons[i].RenderControl(writer);
138                 }
139                  if (i < (end - 1 ))
140                     writer.Write( "   " );
141             }
142
143             LiteralControl l1 = new LiteralControl( "   " );
144             l1.RenderControl(writer);
145         }
146
147          private void RenderPagingButtons(HtmlTextWriter writer)
148         {
149              int totalPages;
150
151             totalPages = CalculateTotalPages();
152
153              if (totalPages <= 10 )
154             {
155                 RenderButtonRange( 0 , totalPages, writer);
156             }
157              else
158             {
159                  int lowerBound = (PageIndex - 4 );
160                  int upperBount = (PageIndex + 6 );
161
162                  if (lowerBound <= 0 )
163                     lowerBound = 0 ;
164
165                  if (PageIndex <= 4 )
166                     RenderButtonRange( 0 , 10 , writer);
167
168                  else if (PageIndex < (totalPages - 5 ))
169                     RenderButtonRange(lowerBound, (PageIndex + 6 ), writer);
170
171                  else if (PageIndex >= (totalPages - 5 ))
172                     RenderButtonRange((totalPages - 10 ), totalPages, writer);
173             }
174         }
175
176          #endregion
177
178          #region 控件树方法
179          /// <summary>
180          /// 信息标签
181          /// </summary>
182          void AddCountLabel()
183         {
184             countLabel = new Label();
185             countLabel.ID = " countLabel " ;
186             countLabel.Text = string .Format(text, CalculateTotalPages().ToString( " n0 " ));
187
188             Controls.Add(countLabel);
189         }
190
191          private void AddPageButtons()
192         {
193             pagingLinkButtons = new HyperLink[CalculateTotalPages()];
194
195              for ( int i = 0 ; i < pagingLinkButtons.Length; i ++ )
196             {
197                 pagingLinkButtons[i] = new HyperLink();
198                 pagingLinkButtons[i].EnableViewState = false ;
199                 pagingLinkButtons[i].Text = (i + 1 ).ToString();
200                 pagingLinkButtons[i].ID = i.ToString();
201                 pagingLinkButtons[i].CssClass = linkCss;
202                 pagingLinkButtons[i].NavigateUrl = GetHrefString(i);
203
204                 Controls.Add(pagingLinkButtons[i]);
205             }
206         }
207
208          /// <summary>
209          /// 首页末页
210          /// </summary>
211          void AddFirstLastHyperLinks()
212         {
213             firstButton = new HyperLink();
214             firstButton.ID = " First " ;
215             firstButton.Text = " 首页 " ;
216              if (PageIndex != 0 && CalculateTotalPages() > 0 )
217             {
218                 firstButton.NavigateUrl = GetHrefString( 0 );
219             }
220              else
221             {
222                 firstButton.Enabled = false ;
223             }
224
225             Controls.Add(firstButton);
226
227             lastButton = new HyperLink();
228             lastButton.ID = " Last " ;
229             lastButton.Text = " 末页 " ;
230              if (PageIndex != CalculateTotalPages() - 1 )
231             {
232                 lastButton.NavigateUrl = GetHrefString(CalculateTotalPages() - 1 );
233             }
234              else
235             {
236                 lastButton.Enabled = false ;
237             }
238             Controls.Add(lastButton);
239         }
240
241          /// <summary>
242          /// 上一页下一页
243          /// </summary>
244          void AddPreviousNextHyperLinks()
245         {
246             previousButton = new HyperLink();
247             previousButton.ID = " Prev " ;
248             previousButton.Text = " 上一页 " ;
249              if (HasPrevious)
250             {
251                 previousButton.NavigateUrl = GetHrefString(PageIndex - 1 );
252             }
253              else
254             {
255                 previousButton.Enabled = false ;
256             }
257             Controls.Add(previousButton);
258
259             nextButton = new HyperLink();
260             nextButton.ID = " Next " ;
261             nextButton.Text = " 下一页 " ;
262              if (HasNext)
263             {
264                 nextButton.NavigateUrl = GetHrefString(PageIndex + 1 );
265             }
266              else
267             {
268                 nextButton.Enabled = false ;
269             }
270             Controls.Add(nextButton);
271         }
272          #endregion
273
274          #region 私有属性
275          private bool HasPrevious
276         {
277              get
278             {
279                  if (PageIndex > 0 )
280                      return true ;
281
282                  return false ;
283             }
284         }
285
286          private bool HasNext
287         {
288              get
289             {
290                  if (PageIndex + 1 < CalculateTotalPages() )
291                      return true ;
292
293                  return false ;
294             }
295         }
296          #endregion
297
298          #region 帮助方法和公共属性
299
300          /// <summary>
301          /// 获取分页导航按钮的超链接字符串
302          /// </summary>
303          /// <param name="pageIndex"> 该分页按钮相对应的页索引 </param>
304          /// <returns> 分页导航按钮的超链接字符串 </returns>
305          private string GetHrefString( int pageIndex)
306         {
307              string url = Page.Request.RawUrl;
308
309              if (Regex.IsMatch(url, @" (/d+).shtml " , RegexOptions.IgnoreCase))
310             {
311                 url = Regex.Replace(url, @" (/d+).shtml " , pageIndex + " .shtml " );
312             }
313
314              if (Regex.IsMatch(url, @" PageIndex=(/d+) " , RegexOptions.IgnoreCase))
315             {
316                 url = Regex.Replace(url, @" PageIndex=(/d+) " , " PageIndex= " + pageIndex.ToString());
317             }
318
319              return Page.Server.UrlPathEncode(url);
320         }
321
322          public int CalculateTotalPages()
323         {
324              int totalPagesAvailable;
325
326              if (TotalRecords == 0 )
327                  return 0 ;
328
329             totalPagesAvailable = TotalRecords / PageSize;
330
331              if ((TotalRecords % PageSize) > 0 )
332                 totalPagesAvailable ++ ;
333
334              return totalPagesAvailable;
335         }
336
337          /// <summary>
338          /// 当前页
339          /// </summary>
340          public int PageIndex
341         {
342              get
343             {
344                  int _pageIndex = 0 ;
345
346                  if (( ! Page.IsPostBack) && (context.PageIndex > 0 ))
347                     _pageIndex = context.PageIndex;
348                  else
349                     _pageIndex = Convert.ToInt32(ViewState[ " PageIndex " ]);
350
351                  if (_pageIndex < 0 )
352                      return 0 ;
353                  else
354                 {
355                      if (_pageIndex > CalculateTotalPages() - 1 )
356                          return CalculateTotalPages() - 1 ;
357                      else
358                          return _pageIndex;
359                 }
360             }
361              set
362             {
363                 ViewState[ " PageIndex " ] = value;
364             }
365         }
366
367          /// <summary>
368          /// 每页记录数
369          /// </summary>
370          public int PageSize
371         {
372              get
373             {
374                  int pageSize = Convert.ToInt32(ViewState[ " PageSize " ]);
375
376                  if (pageSize == 0 )
377                 {
378                      return 10 ;
379                 }
380
381                  return pageSize;
382             }
383              set
384             {
385                 ViewState[ " PageSize " ] = value;
386             }
387
388         }
389
390          /// <summary>
391          /// 总记录数
392          /// </summary>
393          public int TotalRecords
394         {
395              get
396             {
397                  return Convert.ToInt32(ViewState[ " TotalRecords " ]);
398             }
399              set
400             {
401                 ViewState[ " TotalRecords " ] = value;
402             }
403         }
404
405          private string text = " 共{0}页 " ;
406
407          private string linkCss = "" ;
408          /// <summary>
409          /// 链接样式
410          /// </summary>
411          public string LinkCss
412         {
413              get { return linkCss; }
414              set { linkCss = value;}
415         }
416
417          private string textCss = "" ;
418          /// <summary>
419          /// 文字样式
420          /// </summary>
421          public string TextCss
422         {
423              get { return textCss; }
424              set { textCss = value;}
425         }
426
427          public string TextFormat
428         {
429              get
430             {
431                  return text;
432             }
433              set
434             {
435                 text = value;
436             }
437         }
438
439          #endregion
440     }
441 }
442

在页面上只需要向下面这样写：

1 <% @ Control Language = " c# " %>
2 <% @ Register TagPrefix = " Anchor " Namespace = " MyCompany.Controls " Assembly = " MyCompany.Controls " %>
3 < ANCHOR:PAGER id ="Pager1" runat ="server" ></ ANCHOR:PAGER >
4

http://yangxiangwu.cnblogs.com/archive/2006/05/09/395023.html