原创企业级控件库之大数据量分页控件

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原创企业级控件库之大数据量分页控件

发布日期：2010年12月18日星期六作者:EricHu

　　在上篇：我介绍了原创企业级控件库之组合查询控件，这篇我将给大家介绍：企业级控件库之大数据量分页控件。

　摘要

　说到分页，大家采用的方法各有千秋，分页在一个中大型软件项目中对数据的快速呈现起到很关键的作用，试想一个数据量上几十万或者几百万的数据表，要是没有分页功能会是一个什么样的效果。总的说来，大家采用的分页方法大同小异，但到底那种方法才是最佳的呢，各有各的看法，让数据说话最有效。今天我给大家分享一个WinForm下大数据量分页控件（当然分页思想也可用于WebForm）。虽然不能说是最佳的，但在我的几个实际项目中，用的都是它，效果不错，可放心使用。

　 成就别人、等于成就自己。我没什么要求，欢迎大家多多支持与评论，觉得不错的，记得点击文章左下角的”关注博客”，就这么简单。同时，你要用什么好的想法，也可以与我交流，谢谢。

　　分页控件运行效果如下图：

用到的分页存储过程:　　

代码

1 -- =============================================
2 -- Author: EricHu QQ:80368704 WebSite:http://www.cnblogs.com/huyong/
3 -- Create date: 2008-10-25
4 -- Description: 千万数量级分页存储过程
5 -- Modify Date: 2010-10-26
6 -- =============================================
7
8 SET ANSI_NULLS ON
9 GO
10 SET QUOTED_IDENTIFIER ON
11 GO
12
13 ALTER PROCEDURE [dbo].[uspDividePage]
14 /*
15 ***************************************************************
16 ** 千万数量级分页存储过程**
17 ***************************************************************
18 参数说明:
19 1.Tables :表名或视图名
20 2.PrimaryKey :主关键字
21 3.Sort :排序语句，不带Order By 比如：UserId Desc,CreateDate Asc
22 4.CurrentPage :当前页码
23 5.PageSize :分页尺寸
24 6.Fields :字段列表(默认为:*)
25 7.Filter :过滤语句，不带Where
26 8.Group :Group语句,不带Group By
27 ***************************************************************/
28 (
29 @Tables varchar(2000),
30 @PrimaryKey varchar(500),
31 @Sort varchar(500) = NULL,
32 @CurrentPage int = 1,
33 @PageSize int = 10,
34 @Fields varchar(2000) = '*',
35 @Filter varchar(1000) = NULL,
36 @Group varchar(1000) = NULL
37 )
38 AS
39 /*默认排序*/
40 IF @Sort IS NULL OR @Sort = ''
41 SET @Sort = @PrimaryKey
42
43 DECLARE @SortTable varchar(1000)
44 DECLARE @SortName varchar(1000)
45 DECLARE @strSortColumn varchar(1000)
46 DECLARE @operator char(2)
47 DECLARE @type varchar(1000)
48 DECLARE @prec int
49
50 /*设定排序语句.*/
51 IF CHARINDEX('DESC',@Sort)>0
52 BEGIN
53 SET @strSortColumn = REPLACE(@Sort, 'DESC', '')
54 SET @operator = '<='
55 END
56 ELSE
57 BEGIN
58 IF CHARINDEX('ASC', @Sort) = 0
59 SET @strSortColumn = REPLACE(@Sort, 'ASC', '')
60 SET @operator = '>='
61 END
62
63 IF CHARINDEX('.', @strSortColumn) > 0
64 BEGIN
65 SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX('.',@strSortColumn))
66 SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX('.',@strSortColumn) + 1, LEN(@strSortColumn))
67 END
68 ELSE
69 BEGIN
70 SET @SortTable = @Tables
71 SET @SortName = @strSortColumn
72 END
73
74 SELECT @type=t.name, @prec=c.prec
75 FROM sysobjects o
76 JOIN syscolumns c on o.id=c.id
77 JOIN systypes t on c.xusertype=t.xusertype
78 WHERE o.name = @SortTable AND c.name = @SortName
79
80 IF CHARINDEX('char', @type) > 0
81 SET @type = @type + '(' + CAST(@prec AS varchar) + ')'
82
83 DECLARE @strPageSize varchar(500)
84 DECLARE @strStartRow varchar(500)
85 DECLARE @strFilter varchar(1000)
86 DECLARE @strSimpleFilter varchar(1000)
87 DECLARE @strGroup varchar(1000)
88 /*默认当前页*/
89 IF @CurrentPage < 1
90 SET @CurrentPage = 1
91
92 /*设置分页参数.*/
93 SET @strPageSize = CAST(@PageSize AS varchar(500))
94 SET @strStartRow = CAST(((@CurrentPage - 1)*@PageSize + 1) AS varchar(500))
95
96 /*筛选以及分组语句.*/
97 IF @Filter IS NOT NULL AND @Filter != ''
98 BEGIN
99 SET @strFilter = ' WHERE ' + @Filter + ' '
100 SET @strSimpleFilter = ' AND ' + @Filter + ' '
101 END
102 ELSE
103 BEGIN
104 SET @strSimpleFilter = ''
105 SET @strFilter = ''
106 END
107
108 IF @Group IS NOT NULL AND @Group != ''
109 SET @strGroup = ' GROUP BY ' + @Group + ' '
110 ELSE
111 SET @strGroup = ''
112
113 /*执行查询语句*/
114 EXEC(
115 '
116 DECLARE @SortColumn ' + @type + '
117 SET ROWCOUNT ' + @strStartRow + '
118 SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
119 SET ROWCOUNT ' + @strPageSize + '
120 SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' + @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
121 ')
122 GO
123
124 SET ANSI_NULLS OFF
125 GO
126 SET QUOTED_IDENTIFIER OFF
127 GO
128

　　本控件类图　　

　　本控件UcpageControl类详细信息

　　本控件PageData类详细信息

　　本控件核心代码

　　　一、数据源提供类PageData,主要负责与存储过程进行交互。

数据源提供(PageData)

1 #region 数据源提供(PageData)
2 /// <summary>
3 /// 数据源提供
4 /// </summary>
5 public class PageData
6 {
7 DataSet ds = null;
8 private int _PageSize = 50; //分页大小
9 private int _PageIndex = 1; //当前页
10 private int _PageCount = 0; //总页数
11 private int _TotalCount = 0; //总记录数
12 private string _QueryFieldName = "*"; //表字段FieldStr
13 private bool _isQueryTotalCounts = true; //是否查询总的记录条数
14 private string _TableName = string.Empty; //表名
15 private string _OrderStr = string.Empty; //排序_SortStr
16 private string _QueryCondition = string.Empty; //查询的条件 RowFilter
17 private string _PrimaryKey = string.Empty; //主键
18
19 /// <summary>
20 /// 是否查询总的记录条数
21 /// </summary>
22 public bool IsQueryTotalCounts
23 {
24 get { return _isQueryTotalCounts; }
25 set { _isQueryTotalCounts = value; }
26 }
27
28 /// <summary>
29 /// 分页大小(每页显示多少条数据)
30 /// </summary>
31 public int PageSize
32 {
33 get
34 {
35 return _PageSize;
36
37 }
38 set
39 {
40 _PageSize = value;
41 }
42 }
43
44 /// <summary>
45 /// 当前页
46 /// </summary>
47 public int PageIndex
48 {
49 get
50 {
51 return _PageIndex;
52 }
53 set
54 {
55 _PageIndex = value;
56 }
57 }
58
59 /// <summary>
60 /// 总页数
61 /// </summary>
62 public int PageCount
63 {
64 get
65 {
66 return _PageCount;
67 }
68 }
69
70 /// <summary>
71 /// 总记录数
72 /// </summary>
73 public int TotalCount
74 {
75 get
76 {
77 return _TotalCount;
78 }
79 }
80
81 /// <summary>
82 /// 表名或视图名
83 /// </summary>
84 public string TableName
85 {
86 get
87 {
88 return _TableName;
89 }
90 set
91 {
92 _TableName = value;
93 }
94 }
95
96 /// <summary>
97 /// 表字段FieldStr
98 /// </summary>
99 public string QueryFieldName
100 {
101 get
102 {
103 return _QueryFieldName;
104 }
105 set
106 {
107 _QueryFieldName = value;
108 }
109 }
110
111 /// <summary>
112 /// 排序字段
113 /// </summary>
114 public string OrderStr
115 {
116 get
117 {
118 return _OrderStr;
119 }
120 set
121 {
122 _OrderStr = value;
123 }
124 }
125
126 /// <summary>
127 /// 查询条件
128 /// </summary>
129 public string QueryCondition
130 {
131 get
132 {
133 return _QueryCondition;
134 }
135 set
136 {
137 _QueryCondition = value;
138 }
139 }
140
141 /// <summary>
142 /// 主键
143 /// </summary>
144 public string PrimaryKey
145 {
146 get
147 {
148 return _PrimaryKey;
149 }
150 set
151 {
152 _PrimaryKey = value;
153 }
154 }
155
156 /// <summary>
157 /// 得到分页数据
158 /// </summary>
159 /// <param name="connectionstring">连接字符串</param>
160 /// <returns>DataSet</returns>
161 public DataSet QueryDataTable(string connectionstring)
162 {
163 SqlParameter[] parameters = {
164 new SqlParameter("@Tables", SqlDbType.VarChar, 255),
165 new SqlParameter("@PrimaryKey" , SqlDbType.VarChar , 255),
166 new SqlParameter("@Sort", SqlDbType.VarChar , 255),
167 new SqlParameter("@CurrentPage", SqlDbType.Int ),
168 new SqlParameter("@PageSize", SqlDbType.Int ),
169 new SqlParameter("@Fields", SqlDbType.VarChar, 255),
170 new SqlParameter("@Filter", SqlDbType.VarChar, 1000),
171 new SqlParameter("@Group" , SqlDbType.VarChar, 1000)
172 };
173 parameters[0].Value = _TableName;
174 parameters[1].Value = _PrimaryKey;
175 parameters[2].Value = _OrderStr;
176 parameters[3].Value = PageIndex;
177 parameters[4].Value = PageSize;
178 parameters[5].Value =_QueryFieldName;
179 parameters[6].Value = _QueryCondition;
180 parameters[7].Value = string.Empty;
181 ds = null;
182 ds = new DataSet();
183 ds = DbHelperSQL.RunProcedure(connectionstring, "uspDividePage", parameters, "tbPageData");
184
185 if (_isQueryTotalCounts)
186 {
187 _TotalCount = GetTotalCount(connectionstring);
188 }
189
190 if (_TotalCount == 0)
191 {
192 _PageIndex = 0;
193 _PageCount = 0;
194 }
195 else
196 {
197 _PageCount = _TotalCount % _PageSize == 0 ? _TotalCount / _PageSize : _TotalCount / _PageSize + 1;
198
199 if (_PageIndex > _PageCount)
200 {
201 _PageIndex = _PageCount;
202 parameters[4].Value = _PageSize;
203 ds = QueryDataTable(connectionstring);
204 }
205 }
206
207 return ds;
208 }
209
210 /// <summary>
211 /// 得到总的记录数
212 /// </summary>
213 /// <param name="connectionstring">连接字符串</param>
214 /// <returns>总的记录数</returns>
215 public int GetTotalCount(string connectionstring)
216 {
217 string strSql = " select count(1) from "+_TableName;
218
219 if (_QueryCondition != string.Empty)
220 {
221 strSql += " where " + _QueryCondition;
222 }
223
224 return Convert.ToInt32(DbHelperSQL.GetSingle(strSql.ToString(), connectionstring));
225 }
226 }
227 #endregion

　　窗体调用方法

　　一、设置窗体调用公共方法。

代码


        #region 绑定DataGridView
/// <summary>
/// 绑定DataGridView
/// </summary>
/// <param name="sTb">表名</param>
/// <param name="sPk">主键</param>
/// <param name="sOrderField">排序字段</param>
/// <param name="sWhere">查询条件</param>
/// <param name="sQueryFieldName">字段列表</param>
/// <returns>总记录数</returns>
        private int dgvBind(string sTb, string sPk, string sOrderField, string sWhere, string sQueryFieldName)
        {
            pageData = null;
            dtPub = null;
            pageData = new PageData();
            dtPub = new DataTable();
            pageData.TableName = sTb;
            pageData.PrimaryKey = sPk;
            pageData.OrderStr = sOrderField;
            pageData.PageIndex = this.ucPageControlTest.PageCurrent;
            pageData.PageSize = 200;
            pageData.QueryCondition = sWhere;
            pageData.QueryFieldName = sQueryFieldName;
            dtPub = pageData.QueryDataTable(ConfigurationSettings.AppSettings["DbConnection"]).Tables["tbPageData"];
this.ucPageControlTest.bindingSource.DataSource = dtPub;
this.ucPageControlTest.bindingNavigator.BindingSource = ucPageControlTest.bindingSource;
            dgvUcPageControlTest.DataSource = null;
            dgvUcPageControlTest.DataSource = this.ucPageControlTest.bindingSource;
if (dgvUcPageControlTest.Rows.Count > 0)
            {
                dgvUcPageControlTest[4, ucPageControlTest.bindingSource.Position].Selected = true;
            }
return pageData.TotalCount;
        }
#endregion

　　　二、在控件的EventPaging事件代码中调用即可。


return dgvBind("tbTestData", "UniqueID", "UniqueID", sQueryWhere, "*");

三、SqlServer测试数据代码如下：

代码

-- =============================================
-- Author: EricHu QQ:80368704 WebSite:http://www.cnblogs.com/huyong/
-- Create date: 2010-12-18
-- Description: 原创企业级控件库之大数据量分页控件---测试数据
-- Modify Date: 2010-12-18
-- =============================================

/*一、创建数据库dbTest*/
CREATE DATABASE dbTest
go

/*二、创建数据表*/
USE [dbTest]
GO

CREATE TABLE [dbo].[tbTestData](
[UniqueID] [bigint] IDENTITY(20000,1) NOT NULL,
[CompanyName] [varchar](200) COLLATE Chinese_PRC_CI_AS NULL,
[CompanyCode] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[Address] [varchar](500) COLLATE Chinese_PRC_CI_AS NULL,
[Owner] [varchar](100) COLLATE Chinese_PRC_CI_AS NULL,
[Memo] [varchar](2000) COLLATE Chinese_PRC_CI_AS NULL,
[InsetDataTime] [datetime] NULL CONSTRAINT [DF_tbTestData_InsetDataTime] DEFAULT (getdate()),
CONSTRAINT [PK_tbTestData] PRIMARY KEY CLUSTERED
(
[UniqueID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

/*三、增加测试数据*/
declare @count bigint
select @count = 1
while @count <= 5000000
begin
insert into tbTestData
values('Company' + cast(@count as varchar),'CompanyCode' + cast(@count as varchar)
,'Address' + cast(@count as varchar),'Owner' + cast(@count as varchar)
,'Memo'+ cast(@count as varchar),getdate())
select @count = @count + 1
end

下面给出本控件完整代码

原创企业级控件库之大数据量分页控件

1 #region 版权信息
2 /*---------------------------------------------------------------------*
3 // Copyright (C) 2010 http://www.cnblogs.com/huyong
4 // 版权所有。
5 // 项目名称：《Winform通用控件库》
6 // 文件名： UcPageControl.cs
7 // 类全名： DotNet.Controls.UcPageControl
8 // 描述: 分页控件
9 // 创建时间： 2010-06-05
10 // 创建人信息： [**** 姓名:胡勇 QQ:80368704 E-Mail:80368704@qq.com *****]
11 *----------------------------------------------------------------------*/
12 #endregion
13
14 using System;
15 using System.Collections.Generic;
16 using System.ComponentModel;
17 using System.Drawing;
18 using System.Data;
19 using System.Data.SqlClient;
20 using System.Windows.Forms;
21 using DotNet.Common;
22 using DotNet.DBUtility;
23
24 namespace DotNet.Controls
25 {
26 #region 委托申明
27 /// <summary>
28 /// 申明委托
29 /// </summary>
30 /// <param name="e"></param>
31 /// <returns></returns>
32 public delegate int EventPagingHandler(EventPagingArg e);
33 #endregion
34
35 #region 分页控件
36 /// <summary>
37 /// 分页控件
38 ///
39 /// 修改纪录(此分页控件经过多次修改，已趋于完美，可放心使用。)
40 /// 2010-12-06 胡勇对上一条、下一条、首条、末条数据导航的隐藏，因为控件本身已做了处理。
41 /// 2010-12-05 胡勇对分页控件代码做了相应优化
42 /// 2010-06-05 胡勇创建分页控件
43 ///
44 /// <author>
45 /// <name>胡勇</name>
46 /// <QQ>80368704</QQ>
47 /// <Email>80368704@qq.com</Email>
48 /// </author>
49 /// </summary>
50 [ToolboxItem(true)]
51 [DefaultEvent("EventPaging")]
52 [ToolboxBitmap(typeof(UcPageControl), "DotNet.Controls.Images.UcPageControl.bmp")]
53 [Description("分页控件")]
54 public partial class UcPageControl : UserControl
55 {
56 #region 申明事件
57 /// <summary>
58 /// 单击移动到当前页上一末记录时发生
59 /// </summary>
60 [Category("数据分页"), Description("单击移动到当前页上一末记录时发生。"),Browsable(false)]
61 public event EventHandler OnBindingNavigatorMovePreviousItemClick;
62
63 /// <summary>
64 /// 单击移动到当前页第一条记录时发生
65 /// </summary>
66 [Category("数据分页"), Description("单击移动到当前页第一条记录时发生。"), Browsable(false)]
67 public event EventHandler OnBindingNavigatorMoveFirstItemClick;
68
69 /// <summary>
70 /// 单击移动到当前页下一条记录时发生
71 /// </summary>
72 [Category("数据分页"), Description("单击移动到当前页下一条记录时发生。"), Browsable(false)]
73 public event EventHandler OnBindingNavigatorMoveNextItemClick;
74
75 /// <summary>
76 /// 单击移动到当前页最后一条记录时发生
77 /// </summary>
78 [Category("数据分页"), Description("单击移动到当前页最后一条记录时发生。"), Browsable(false)]
79 public event EventHandler OnBindingNavigatorMoveLastItemClick;
80
81 /// <summary>
82 /// 单击各分页按钮(上一页、下一页、第一页、最后一页和转到某页)时发生
83 /// </summary>
84 [Category("数据分页"), Description("分页时发生。")]
85 public event EventPagingHandler EventPaging;
86 #endregion
87
88 #region 构造函数
89 public UcPageControl()
90 {
91 InitializeComponent();
92 }
93 #endregion
94
95 #region 属性
96
97 private int _pageSize = 50; //每页显示记录数
98 private int _nMax = 0; //总记录数
99 private int _pageCount = 0; //页数=总记录数/每页显示记录数
100 private int _pageCurrent = 0; //当前页号
101
102 /// <summary>
103 /// 每页显示记录数
104 /// </summary>
105 [Category("数据分页"), Description("每页显示记录数。"), Browsable(false)]
106 public int PageSize
107 {
108 get
109 {
110 return _pageSize;
111 }
112 set
113 {
114 _pageSize = value;
115 GetPageCount();//页数
116 }
117 }
118
119 /// <summary>
120 /// 记录总数
121 /// </summary>
122 [Category("数据分页"), Description("记录总数。"),Browsable(false)]
123 public int NMax
124 {
125 get
126 {
127 return _nMax;
128 }
129 set
130 {
131 _nMax = value;
132 GetPageCount();
133 }
134 }
135
136 /// <summary>
137 /// 页数
138 /// </summary>
139 [Category("数据分页"), Description("页数。"), Browsable(false)]
140 public int PageCount
141 {
142 get
143 {
144 return _pageCount;
145 }
146 set
147 {
148 _pageCount = value;
149 }
150 }
151
152 /// <summary>
153 /// 当前页号
154 /// </summary>
155 [Category("数据分页"), Description("当前页号。"), Browsable(false)]
156 public int PageCurrent
157 {
158 get
159 {
160 return _pageCurrent;
161 }
162 set
163 {
164 _pageCurrent = value;
165 }
166 }
167 #endregion
168
169 #region 方法
170 [Category("数据分页"), Description("bindingNavigator。"), Browsable(false)]
171 public BindingNavigator ToolBar
172 {
173 get
174 {
175 return this.bindingNavigator;
176 }
177 }
178
179 /// <summary>
180 /// 得到总页数
181 /// </summary>
182 private void GetPageCount()
183 {
184 if (this.NMax > 0)
185 {
186 this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize)));
187 }
188 else
189 {
190 this.PageCount = 0;
191 }
192 }
193
194 /// <summary>
195 /// 绑定分页控件(关键代码)
196 /// </summary>
197 public void Bind()
198 {
199 if (this.EventPaging != null)
200 {
201 this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent));
202 }
203
204 if (this.PageCurrent > this.PageCount)
205 {
206 this.PageCurrent = this.PageCount;
207 }
208 if (this.PageCount == 1)
209 {
210 this.PageCurrent = 1;
211 }
212 lblPageCount.Text = this.PageCount.ToString();
213 this.lblMaxPage.Text = "共"+this.NMax.ToString()+"条记录";
214 this.txtCurrentPage.Text = this.PageCurrent.ToString();
215
216 if (this.PageCurrent == 1)
217 {
218 this.btnPrev.Enabled = false;
219 this.btnFirst.Enabled = false;
220 }
221 else
222 {
223 btnPrev.Enabled = true;
224 btnFirst.Enabled = true;
225 }
226
227 if (this.PageCurrent == this.PageCount)
228 {
229 this.btnLast.Enabled = false;
230 this.btnNext.Enabled = false;
231 }
232 else
233 {
234 btnLast.Enabled = true;
235 btnNext.Enabled = true;
236 }
237
238 if (this.NMax == 0)
239 {
240 btnNext.Enabled = false;
241 btnLast.Enabled = false;
242 btnFirst.Enabled = false;
243 btnPrev.Enabled = false;
244 }
245 }
246
247 #endregion
248
249 #region 按钮事件
250 private void btnFirst_Click(object sender, EventArgs e)
251 {
252 PageCurrent = 1;
253 this.Bind();
254 }
255
256 private void btnPrev_Click(object sender, EventArgs e)
257 {
258 PageCurrent -= 1;
259 if (PageCurrent <= 0)
260 {
261 PageCurrent = 1;
262 }
263 this.Bind();
264 }
265
266 private void btnNext_Click(object sender, EventArgs e)
267 {
268 this.PageCurrent += 1;
269 if (PageCurrent > PageCount)
270 {
271 PageCurrent = PageCount;
272 }
273 this.Bind();
274 }
275
276 private void btnLast_Click(object sender, EventArgs e)
277 {
278 PageCurrent = PageCount;
279 this.Bind();
280 }
281
282 private void btnGo_Click(object sender, EventArgs e)
283 {
284 if (this.txtCurrentPage.Text != null && txtCurrentPage.Text != "")
285 {
286 if (Int32.TryParse(txtCurrentPage.Text, out _pageCurrent))
287 {
288 this.Bind();
289 }
290 else
291 {
292 DialogHelper.ShowErrorMsg("输入数字格式错误！");
293 }
294 }
295 }
296
297 private void txtCurrentPage_KeyDown(object sender, KeyEventArgs e)
298 {
299 if (e.KeyCode == Keys.Enter)
300 {
301 this.Bind();
302 }
303 }
304
305 private void bindingNavigatorMovePreviousItem_Click(object sender, EventArgs e)
306 {
307 if(OnBindingNavigatorMovePreviousItemClick != null)
308 {
309 OnBindingNavigatorMovePreviousItemClick(this, null);
310 }
311 }
312
313 private void bindingNavigatorMoveFirstItem_Click(object sender, EventArgs e)
314 {
315 if (OnBindingNavigatorMoveFirstItemClick != null)
316 {
317 OnBindingNavigatorMoveFirstItemClick(this, null);
318 }
319 }
320
321 private void bindingNavigatorMoveNextItem_Click(object sender, EventArgs e)
322 {
323 if (OnBindingNavigatorMoveNextItemClick != null)
324 {
325 OnBindingNavigatorMoveNextItemClick(this, null);
326 }
327 }
328
329 private void bindingNavigatorMoveLastItem_Click(object sender, EventArgs e)
330 {
331 if (OnBindingNavigatorMoveLastItemClick != null)
332 {
333 OnBindingNavigatorMoveLastItemClick(this, null);
334 }
335 }
336 #endregion
337 }
338 #endregion
339
340 #region 自定义事件数据基类
341 /// <summary>
342 /// 自定义事件数据基类
343 /// </summary>
344 public class EventPagingArg : EventArgs
345 {
346 private int _intPageIndex;
347 public EventPagingArg(int PageIndex)
348 {
349 _intPageIndex = PageIndex;
350 }
351 }
352 #endregion
353
354 #region 数据源提供(PageData)
355 /// <summary>
356 /// 数据源提供
357 /// </summary>
358 public class PageData
359 {
360 DataSet ds = null;
361 private int _PageSize = 50; //分页大小
362 private int _PageIndex = 1; //当前页
363 private int _PageCount = 0; //总页数
364 private int _TotalCount = 0; //总记录数
365 private string _QueryFieldName = "*"; //表字段FieldStr
366 private bool _isQueryTotalCounts = true; //是否查询总的记录条数
367 private string _TableName = string.Empty; //表名
368 private string _OrderStr = string.Empty; //排序_SortStr
369 private string _QueryCondition = string.Empty; //查询的条件 RowFilter
370 private string _PrimaryKey = string.Empty; //主键
371
372 /// <summary>
373 /// 是否查询总的记录条数
374 /// </summary>
375 public bool IsQueryTotalCounts
376 {
377 get { return _isQueryTotalCounts; }
378 set { _isQueryTotalCounts = value; }
379 }
380
381 /// <summary>
382 /// 分页大小(每页显示多少条数据)
383 /// </summary>
384 public int PageSize
385 {
386 get
387 {
388 return _PageSize;
389
390 }
391 set
392 {
393 _PageSize = value;
394 }
395 }
396
397 /// <summary>
398 /// 当前页
399 /// </summary>
400 public int PageIndex
401 {
402 get
403 {
404 return _PageIndex;
405 }
406 set
407 {
408 _PageIndex = value;
409 }
410 }
411
412 /// <summary>
413 /// 总页数
414 /// </summary>
415 public int PageCount
416 {
417 get
418 {
419 return _PageCount;
420 }
421 }
422
423 /// <summary>
424 /// 总记录数
425 /// </summary>
426 public int TotalCount
427 {
428 get
429 {
430 return _TotalCount;
431 }
432 }
433
434 /// <summary>
435 /// 表名或视图名
436 /// </summary>
437 public string TableName
438 {
439 get
440 {
441 return _TableName;
442 }
443 set
444 {
445 _TableName = value;
446 }
447 }
448
449 /// <summary>
450 /// 表字段FieldStr
451 /// </summary>
452 public string QueryFieldName
453 {
454 get
455 {
456 return _QueryFieldName;
457 }
458 set
459 {
460 _QueryFieldName = value;
461 }
462 }
463
464 /// <summary>
465 /// 排序字段
466 /// </summary>
467 public string OrderStr
468 {
469 get
470 {
471 return _OrderStr;
472 }
473 set
474 {
475 _OrderStr = value;
476 }
477 }
478
479 /// <summary>
480 /// 查询条件
481 /// </summary>
482 public string QueryCondition
483 {
484 get
485 {
486 return _QueryCondition;
487 }
488 set
489 {
490 _QueryCondition = value;
491 }
492 }
493
494 /// <summary>
495 /// 主键
496 /// </summary>
497 public string PrimaryKey
498 {
499 get
500 {
501 return _PrimaryKey;
502 }
503 set
504 {
505 _PrimaryKey = value;
506 }
507 }
508
509 /// <summary>
510 /// 得到分页数据
511 /// </summary>
512 /// <param name="connectionstring">连接字符串</param>
513 /// <returns>DataSet</returns>
514 public DataSet QueryDataTable(string connectionstring)
515 {
516 SqlParameter[] parameters = {
517 new SqlParameter("@Tables", SqlDbType.VarChar, 255),
518 new SqlParameter("@PrimaryKey" , SqlDbType.VarChar , 255),
519 new SqlParameter("@Sort", SqlDbType.VarChar , 255),
520 new SqlParameter("@CurrentPage", SqlDbType.Int ),
521 new SqlParameter("@PageSize", SqlDbType.Int ),
522 new SqlParameter("@Fields", SqlDbType.VarChar, 255),
523 new SqlParameter("@Filter", SqlDbType.VarChar, 1000),
524 new SqlParameter("@Group" , SqlDbType.VarChar, 1000)
525 };
526 parameters[0].Value = _TableName;
527 parameters[1].Value = _PrimaryKey;
528 parameters[2].Value = _OrderStr;
529 parameters[3].Value = PageIndex;
530 parameters[4].Value = PageSize;
531 parameters[5].Value =_QueryFieldName;
532 parameters[6].Value = _QueryCondition;
533 parameters[7].Value = string.Empty;
534 ds = null;
535 ds = new DataSet();
536 ds = DbHelperSQL.RunProcedure(connectionstring, "uspDividePage", parameters, "tbPageData");
537
538 if (_isQueryTotalCounts)
539 {
540 _TotalCount = GetTotalCount(connectionstring);
541 }
542
543 if (_TotalCount == 0)
544 {
545 _PageIndex = 0;
546 _PageCount = 0;
547 }
548 else
549 {
550 _PageCount = _TotalCount % _PageSize == 0 ? _TotalCount / _PageSize : _TotalCount / _PageSize + 1;
551
552 if (_PageIndex > _PageCount)
553 {
554 _PageIndex = _PageCount;
555 parameters[4].Value = _PageSize;
556 ds = QueryDataTable(connectionstring);
557 }
558 }
559
560 return ds;
561 }
562
563 /// <summary>
564 /// 得到总的记录数
565 /// </summary>
566 /// <param name="connectionstring">连接字符串</param>
567 /// <returns>总的记录数</returns>
568 public int GetTotalCount(string connectionstring)
569 {
570 string strSql = " select count(1) from "+_TableName;
571
572 if (_QueryCondition != string.Empty)
573 {
574 strSql += " where " + _QueryCondition;
575 }
576
577 return Convert.ToInt32(DbHelperSQL.GetSingle(strSql.ToString(), connectionstring));
578 }
579 }
580 #endregion
581 }
582

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