学步园

原文地址：http://www.cnblogs.com/nosnowwolf/archive/2008/07/22/1248796.html

http://blog.csdn.net/wanglong7505/archive/2010/01/16/5193085.aspx

效果如下：

代码实现如下：

namespace WindowsApp.MyControl
{
/**//// <summary>
/// 申明委托
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public delegate int EventPagingHandler(EventPagingArg e);
/**//// <summary>
/// 分页控件呈现
/// </summary>
public partial class Pager : UserControl
{
public Pager()
{
            InitializeComponent();
        }
public event EventPagingHandler EventPaging;
/**//// <summary>
/// 每页显示记录数
/// </summary>
private int _pageSize = 20;
/**//// <summary>
/// 每页显示记录数
/// </summary>
public int PageSize
{
get { return _pageSize; }
set
{
                _pageSize = value;
                GetPageCount();
            }
        }

private int _nMax = 0;
/**//// <summary>
/// 总记录数
/// </summary>
public int NMax
{
get { return _nMax; }
set
{
                _nMax = value;
                GetPageCount();
            }
        }

private int _pageCount = 0;
/**//// <summary>
/// 页数=总记录数/每页显示记录数
/// </summary>
public int PageCount
{
get { return _pageCount; }
set { _pageCount = value; }
        }

private int _pageCurrent = 0;
/**//// <summary>
/// 当前页号
/// </summary>
public int PageCurrent
{
get { return _pageCurrent; }
set { _pageCurrent = value; }
        }


private void GetPageCount()
{
if (this.NMax > 0)
{
this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize)));
            }
else
{
this.PageCount = 0;
            }
        }

/**//// <summary>
/// 翻页控件数据绑定的方法
/// </summary>
public void Bind()
{
if (this.EventPaging != null)
{
this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent));
            }

if (this.PageCurrent > this.PageCount)
{
this.PageCurrent = this.PageCount;
            }
if (this.PageCount == 1)
{
this.PageCurrent = 1;
            }
            lblPageCount.Text = this.PageCount.ToString();
this.lblMaxPage.Text = "共"+this.NMax.ToString()+"条记录";
this.txtCurrentPage.Text = this.PageCurrent.ToString();

if (this.PageCurrent == 1)
{
this.btnPrev.Enabled = false;
this.btnFirst.Enabled = false;
            }
else
{
                btnPrev.Enabled = true;
                btnFirst.Enabled = true;
            }

if (this.PageCurrent == this.PageCount)
{
this.btnLast.Enabled = false;
this.btnNext.Enabled = false;
            }
else
{
                btnLast.Enabled = true;
                btnNext.Enabled = true;
            }

if (this.NMax == 0)
{
                btnNext.Enabled = false;
                btnLast.Enabled = false;
                btnFirst.Enabled = false;
                btnPrev.Enabled = false;
            }
        }

private void btnFirst_Click(object sender, EventArgs e)
{
            PageCurrent = 1;
this.Bind();
        }

private void btnPrev_Click(object sender, EventArgs e)
{
            PageCurrent -= 1;
if (PageCurrent <= 0)
{
                PageCurrent = 1;
            }
this.Bind();
        }

private void btnNext_Click(object sender, EventArgs e)
{
this.PageCurrent += 1;
if (PageCurrent > PageCount)
{
                PageCurrent = PageCount;
            }
this.Bind();
        }

private void btnLast_Click(object sender, EventArgs e)
{
            PageCurrent = PageCount;
this.Bind();
        }

private void btnGo_Click(object sender, EventArgs e)
{
if (this.txtCurrentPage.Text != null && txtCurrentPage.Text != "")
{
if (Int32.TryParse(txtCurrentPage.Text, out _pageCurrent))
{
this.Bind();
                }
else
{
                    Common.MessageProcess.ShowError("输入数字格式错误！");
                }
            }
        }

    }
/**//// <summary>
/// 自定义事件数据基类
/// </summary>
public class EventPagingArg : EventArgs
{
private int _intPageIndex;
public EventPagingArg(int PageIndex)
{
            _intPageIndex = PageIndex;
        }
    }
}

控件功能基本实现。

如何绑定数据呢？

大数量分页，使用存储过程。

这个存储过程是网络上考的，呵呵。我把它给贴出来，希望原作者别砸我砖头。。。。。

ALTER PROCEDURE SP_Pagination
/**//*
***************************************************************
** 千万数量级分页存储过程 **
***************************************************************
参数说明:
1.Tables :表名称,视图
2.PrimaryKey :主关键字
3.Sort :排序语句，不带Order By 比如：NewsID Desc,OrderRows Asc
4.CurrentPage :当前页码
5.PageSize :分页尺寸
6.Filter :过滤语句，不带Where
7.Group :Group语句,不带Group By
效果演示：http://www.cn5135.com/_App/Enterprise/QueryResult.aspx
***************************************************************/
(
@Tables varchar(2000),
@PrimaryKey varchar(500),
@Sort varchar(500) = NULL,
@CurrentPage int = 1,
@PageSize int = 10,
@Fields varchar(2000) = '*',
@Filter varchar(1000) = NULL,
@Group varchar(1000) = NULL
)
AS
/**//*默认排序*/
IF @Sort IS NULL OR @Sort = ''
SET @Sort = @PrimaryKey
DECLARE @SortTable varchar(1000)
DECLARE @SortName varchar(1000)
DECLARE @strSortColumn varchar(1000)
DECLARE @operator char(2)
DECLARE @type varchar(1000)
DECLARE @prec int
/**//*设定排序语句.*/
IF CHARINDEX('DESC',@Sort)>0
BEGIN
SET @strSortColumn = REPLACE(@Sort, 'DESC', '')
SET @operator = '<='
END
ELSE
BEGIN
IF CHARINDEX('ASC', @Sort) = 0
SET @strSortColumn = REPLACE(@Sort, 'ASC', '')
SET @operator = '>='
END
IF CHARINDEX('.', @strSortColumn) > 0
BEGIN
SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX('.',@strSortColumn))
SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX('.',@strSortColumn) + 1, LEN(@strSortColumn))
END
ELSE
BEGIN
SET @SortTable = @Tables
SET @SortName = @strSortColumn
END
SELECT @type=t.name, @prec=c.prec
FROM sysobjects o
JOIN syscolumns c on o.id=c.id
JOIN systypes t on c.xusertype=t.xusertype
WHERE o.name = @SortTable AND c.name = @SortName
IF CHARINDEX('char', @type) > 0
SET @type = @type + '(' + CAST(@prec AS varchar) + ')'
DECLARE @strPageSize varchar(500)
DECLARE @strStartRow varchar(500)
DECLARE @strFilter varchar(1000)
DECLARE @strSimpleFilter varchar(1000)
DECLARE @strGroup varchar(1000)
/**//*默认当前页*/
IF @CurrentPage < 1
SET @CurrentPage = 1
/**//*设置分页参数.*/
SET @strPageSize = CAST(@PageSize AS varchar(500))
SET @strStartRow = CAST(((@CurrentPage - 1)*@PageSize + 1) AS varchar(500))
/**//*筛选以及分组语句.*/
IF @Filter IS NOT NULL AND @Filter != ''
BEGIN
SET @strFilter = ' WHERE ' + @Filter + ' '
SET @strSimpleFilter = ' AND ' + @Filter + ' '
END
ELSE
BEGIN
SET @strSimpleFilter = ''
SET @strFilter = ''
END
IF @Group IS NOT NULL AND @Group != ''
SET @strGroup = ' GROUP BY ' + @Group + ' '
ELSE
SET @strGroup = ''
/**//*执行查询语句*/
EXEC(
'
DECLARE @SortColumn ' + @type + '
SET ROWCOUNT ' + @strStartRow + '
SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
SET ROWCOUNT ' + @strPageSize + '
SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' + @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
'
)

使用该存储过陈，得到数据，将数据绑定到数据控件，提供了一个pageData类

/**//// <summary>
/// 数据源提供
/// </summary>
public class PageData
{
private int _PageSize = 10;
private int _PageIndex = 1;
private int _PageCount = 0;
private int _TotalCount = 0;
private string _TableName;//表名
private string _QueryFieldName = "*";//表字段FieldStr
private string _OrderStr = string.Empty; //排序_SortStr
private string _QueryCondition = string.Empty;//查询的条件 RowFilter
private string _PrimaryKey = string.Empty;//主键
/**//// <summary>
/// 显示页数
/// </summary>
public int PageSize
{
get
{
return _PageSize;

            }
set
{
                _PageSize = value;
            }
        }
/**//// <summary>
/// 当前页
/// </summary>
public int PageIndex
{
get
{
return _PageIndex;
            }
set
{
                _PageIndex = value;
            }
        }
/**//// <summary>
/// 总页数
/// </summary>
public int PageCount
{
get
{
return _PageCount;
            }
        }
/**//// <summary>
/// 总记录数
/// </summary>
public int TotalCount
{
get
{
return _TotalCount;
            }
        }
/**//// <summary>
/// 表名，包括视图
/// </summary>
public string TableName
{
get
{
return _TableName;
            }
set
{
                _TableName = value;
            }
        }
/**//// <summary>
/// 表字段FieldStr
/// </summary>
public string QueryFieldName
{
get
{
return _QueryFieldName;
            }
set
{
                _QueryFieldName = value;
            }
        }
/**//// <summary>
/// 排序字段
/// </summary>
public string OrderStr
{
get
{
return _OrderStr;
            }
set
{
                _OrderStr = value;
            }
        }
/**//// <summary>
/// 查询条件
/// </summary>
public string QueryCondition
{
get
{
return _QueryCondition;
            }
set
{
                _QueryCondition = value;
            }
        }
/**//// <summary>
/// 主键