再上数据分页控件（不用存储过程）
再上数据分页控件（不用存储过程）
发布日期：2011年04月04日 星期一 作者:EricHu
本篇主要内容如下：
· 概述
· 本分页控件原理。
· 分页控件代码。
· 分页控件使用实例。
概述
在前几篇：我介绍了原创企业级控件库之大数据据量分页控件，这个控件主要是通过存储过程进行数据分页，得到了大家的支持，也给出了许多宝贵的建议，在这儿先感谢各位。同时也让我更有信心进行以后的文章（企业级控件库系列）。
分页对于每个项目来说都有它存在的意义，想起在以前刚刚刚软件开发时，由于刚刚毕业，理论知识雄厚，但实际工作经验欠缺，记得几年前做开发时，数据量很大，要用分页，一开始真不知道如何是好，方法到知道，但速度与稳定性却没有经验。在这儿，我只是起到一个抛砖引玉的作用，以便引起我们在实际工作中要多思考，对同一件事多想几种解决方式，只有这样才能不断提高，同时要学会总结。
这篇我将给大家介绍：不用存储过程，直接用代码来实现数据分页，欢迎大家拍砖，觉得不错的可以推荐下。同时，你要用什么好的想法，也可以与我交流，谢谢。
本分页控件原理
分页的方法很多，有用存储过程的，有不用存储过程的，还有在C#中用DataGridView的虚拟模式的，目的只有一个，对大数据量进行处理，让用户体验得到提高，软件速度得到提升。本分页控件主要是用了下面的SQL语句，我相信你能看懂的，存储过程分页也是用类似的SQL代码：
1/*TableName:表名如:tbTestData
2SqlWhereStatement :SqlWhere表达式如:where表达式为空
3PrimaryKey :主键如:UniqueID
4PageSize :分页大小如:50
5pageIndex:当前页如:8
6OrderField :排序字段如:InsetDataTime
7*/
8
9SELECTTOP50*FROMtbTestData
10WHEREUniqueIDNOTIN
11(
12SELECTTOP(50*8)UniqueIDFROMtbTestDataORDERBYInsetDataTimeDESC
13)
14ORDERBYInsetDataTimeDESC
2SqlWhereStatement :SqlWhere表达式如:where表达式为空
3PrimaryKey :主键如:UniqueID
4PageSize :分页大小如:50
5pageIndex:当前页如:8
6OrderField :排序字段如:InsetDataTime
7*/
8
9SELECTTOP50*FROMtbTestData
10WHEREUniqueIDNOTIN
11(
12SELECTTOP(50*8)UniqueIDFROMtbTestDataORDERBYInsetDataTimeDESC
13)
14ORDERBYInsetDataTimeDESC
原理就这么简单。
分页控件代码
（一）、实例数据库代码
创建实例数据库。
CREATETABLE[tbTestData](
[UniqueID][bigint]NOTNULL,
[CompanyName][varchar](200)NULL,
[CompanyCode][varchar](50)NULL,
[Address][varchar](500)NULL,
[Owner][varchar](100)NULL,
[Memo][varchar](2000)NULL,
[InsetDataTime][datetime]NULL,
CONSTRAINT[PK_tbTestData]PRIMARYKEYCLUSTERED
(
[UniqueID]ASC
)WITH(PAD_INDEX=OFF,STATISTICS_NORECOMPUTE=OFF,IGNORE_DUP_KEY=OFF,ALLOW_ROW_LOCKS=ON,ALLOW_PAGE_LOCKS=ON)ON[PRIMARY]
)ON[PRIMARY]
GO
ALTERTABLE[dbo].[tbTestData]ADDCONSTRAINT[DF_tbTestData_InsetDataTime]DEFAULT(getdate())FOR[InsetDataTime]
GO
--生成实例数据
declare@intRowNumberint;
select@intRowNumber=1;
while@intRowNumber<1000000
begin
insertintotbTestData(UniqueID,CompanyName,CompanyCode,Address,Owner,Memo)
values(@intRowNumber,'CompanyName'+cast(@intRowNumberasvarchar(2000)),
'CompanyCode'+cast(@intRowNumberasvarchar(2000)),'Address'+cast(@intRowNumberasvarchar(2000)),
'Owner'+cast(@intRowNumberasvarchar(2000)),'Memo'+cast(@intRowNumberasvarchar(2000)));
select@intRowNumber=@intRowNumber+1
end
[UniqueID][bigint]NOTNULL,
[CompanyName][varchar](200)NULL,
[CompanyCode][varchar](50)NULL,
[Address][varchar](500)NULL,
[Owner][varchar](100)NULL,
[Memo][varchar](2000)NULL,
[InsetDataTime][datetime]NULL,
CONSTRAINT[PK_tbTestData]PRIMARYKEYCLUSTERED
(
[UniqueID]ASC
)WITH(PAD_INDEX=OFF,STATISTICS_NORECOMPUTE=OFF,IGNORE_DUP_KEY=OFF,ALLOW_ROW_LOCKS=ON,ALLOW_PAGE_LOCKS=ON)ON[PRIMARY]
)ON[PRIMARY]
GO
ALTERTABLE[dbo].[tbTestData]ADDCONSTRAINT[DF_tbTestData_InsetDataTime]DEFAULT(getdate())FOR[InsetDataTime]
GO
--生成实例数据
declare@intRowNumberint;
select@intRowNumber=1;
while@intRowNumber<1000000
begin
insertintotbTestData(UniqueID,CompanyName,CompanyCode,Address,Owner,Memo)
values(@intRowNumber,'CompanyName'+cast(@intRowNumberasvarchar(2000)),
'CompanyCode'+cast(@intRowNumberasvarchar(2000)),'Address'+cast(@intRowNumberasvarchar(2000)),
'Owner'+cast(@intRowNumberasvarchar(2000)),'Memo'+cast(@intRowNumberasvarchar(2000)));
select@intRowNumber=@intRowNumber+1
end
（二）、分页控件代码。
namespaceDotNet.Controls
{
///<summary>
///分页控件（使用代码实现，不用存储过程）
///UcPageControlByCode
///修改纪录
///
///2010-01-06胡勇修改转到某页由原来的KeyPress方法改为KeyDown，让用户按回车键确认转页，以防止连续绑定两次。
///2011-01-06胡勇增加对分页控件的初始化代码:publicDataTableInitializePageControl()。
///2011-01-05胡勇创建分页控件
///2011-04-02胡勇优化代码、减少不必要的私有变量，去掉多余的代码
///
///<author>
///<name>胡勇</name>
///<QQ>80368704</QQ>
///<Email>[email protected]</Email>
///</author>
///</summary>
[ToolboxItem(true)]
[DefaultEvent("OnEventPageClicked")]
[ToolboxBitmap(typeof(UcPageControlByCode),"Images.UcPageControlByCodeIcon.png")]
[Description("分页控件（使用代码实现，不用存储过程）")]
publicpartialclassUcPageControlByCode:UserControl
{
#region私有变量
intrecordCount=0;//记录数
intpageCount=0;//总页数
intpageIndex=0;//当前页
#endregion
#region自定义事件
///<summary>
///单击分页按钮(第一页、上一页、下一页、最后页、跳页)时发生
///</summary>
[Category("UcPageControlByCode"),Description("单击分页按钮时发生")]
publiceventEventHandlerOnEventPageClicked;
#endregion
#region自定义属性
privateint_pageSize=50;//分页大小
privatestring_sqlWhereStatement=string.Empty;//MsSqlWhere语句
privatestring_sqlConnString=string.Empty;//MsSql数据库连接字符串
privatestring_tableName=string.Empty;//表名
privatestring_orderField=string.Empty;//数据表的排序字段
privatestring_primaryKey=string.Empty;//数据表的主键
privatestring_queryFieldList="*";//字段列表（默认为：*)
privateDataTable_pageTable=newDataTable();
///<summary>
///返回当前页码
///</summary>
publicintPageIndex
{
get
{
returnpageIndex+1;
}
}
///<summary>
///得到或设置分页大小(默认为:50)
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("得到或设置分页大小(默认为:50)")]
publicintPageSize
{
get
{
return_pageSize;
}
set
{
_pageSize=value;
}
}
///<summary>
///SQL语句的Where表达式
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到或设置SQL语句的Where表达式")]
publicstringSqlWhereStatement
{
get
{
return_sqlWhereStatement;
}
set
{
_sqlWhereStatement=value;
}
}
///<summary>
///得到或设置SqlServer的连接字符串
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到或设置SqlServer的连接字符串")]
publicstringSqlConnString
{
get
{
return_sqlConnString;
}
set
{
_sqlConnString=value;
}
}
///<summary>
///得到用户单击分页按钮后返回的DataTable
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到用户单击分页按钮后返回的DataTable")]
publicDataTablePageTable
{
get
{
return_pageTable;
}
}
///<summary>
///设置或得到与分页控件绑定的表名或视图名
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到与分页控件绑定的表名或视图名")]
publicstringTableName
{
get
{
return_tableName;
}
set
{
_tableName=value;
}
}
///<summary>
///设置或得到分页控件排序字段
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件排序字段")]
publicstringOrderField
{
get
{
return_orderField;
}
set
{
_orderField=value;
}
}
///<summary>
///设置或得到分页控件绑定数据表的主键
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件绑定数据表的主键")]
publicstringPrimaryKey
{
get
{
return_primaryKey;
}
set
{
_primaryKey=value;
}
}
///<summary>
///设置或得到分页控件绑定的字段列表(默认为:*)
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件绑定的字段列表(默认为:*)")]
publicstringQueryFieldList
{
get
{
return_queryFieldList;
}
set
{
_queryFieldList=value;
}
}
#endregion
#region构造函数
///<summary>
///分页控件（使用代码实现，不用存储过程）
///</summary>
publicUcPageControlByCode()
{
InitializeComponent();
}
#endregion
#region分页实现相关代码
#regionvoidSetUcPageControlPars(stringconnStr,stringwhereStatement,stringtbName,stringorderField,stringprimaryKeyName,stringfieldList):给UcPageControlByCode控件传递必需参数
///<summary>
///给UcPageControlByCode控件传递必需参数
///</summary>
///<paramname="connStr">连接字符串</param>
///<paramname="whereStatement">MsSqlWhere语句</param>
///<paramname="tbName">数据表名或视力名</param>
///<paramname="orderField">排序字段</param>
///<paramname="primaryKeyName">主键值</param>
///<paramname="fieldList">字段列表(默认为:*)</param>
publicvoidSetUcPageControlPars(stringconnStr,stringwhereStatement,stringtbName
,stringorderField,stringprimaryKeyName,stringfieldList)
{
if(string.IsNullOrEmpty(connStr.Trim()))
{
DialogHelper.ShowErrorMsg("温馨提示：/n无可用的数据库连接！");
return;
}
else
{
this.SqlConnString=connStr;
}
this.SqlWhereStatement=whereStatement;
this.TableName=tbName;
this.OrderField=orderField;
this.PrimaryKey=primaryKeyName;
if(!string.IsNullOrEmpty(fieldList.Trim()))
{
this.QueryFieldList=fieldList;
}
}
#endregion
#regionDataTableInitializePageControl():初始化UcPageControlByCode
///<summary>
///绑定UcPageControlByCode(并返回包含当前页的DataTable)
///</summary>
///<returns>DataTable</returns>
publicDataTableBindPageControl()
{
recordCount=GetTotalRecordCount();//获取总记录数
pageCount=recordCount/PageSize-ModPage();//保存总页数（减去ModPage()函数防止SQL语句执行时溢出查询范围，可以用存储过程分页算法来理解这句）
pageIndex=0;//保存一个为0的页面索引值到pageIndex
lblPageCount.Text=(recordCount/PageSize+OverPage()).ToString();//显示lblpageCount、lblrecCount的状态
lblRecCount.Text=recordCount.ToString();
if(recordCount<=PageSize)
{
txtGoToPage.Enabled=false;
}
else
{
txtGoToPage.Enabled=true;
}
returnTDataBind();
}
#endregion
{
///<summary>
///分页控件（使用代码实现，不用存储过程）
///UcPageControlByCode
///修改纪录
///
///2010-01-06胡勇修改转到某页由原来的KeyPress方法改为KeyDown，让用户按回车键确认转页，以防止连续绑定两次。
///2011-01-06胡勇增加对分页控件的初始化代码:publicDataTableInitializePageControl()。
///2011-01-05胡勇创建分页控件
///2011-04-02胡勇优化代码、减少不必要的私有变量，去掉多余的代码
///
///<author>
///<name>胡勇</name>
///<QQ>80368704</QQ>
///<Email>[email protected]</Email>
///</author>
///</summary>
[ToolboxItem(true)]
[DefaultEvent("OnEventPageClicked")]
[ToolboxBitmap(typeof(UcPageControlByCode),"Images.UcPageControlByCodeIcon.png")]
[Description("分页控件（使用代码实现，不用存储过程）")]
publicpartialclassUcPageControlByCode:UserControl
{
#region私有变量
intrecordCount=0;//记录数
intpageCount=0;//总页数
intpageIndex=0;//当前页
#endregion
#region自定义事件
///<summary>
///单击分页按钮(第一页、上一页、下一页、最后页、跳页)时发生
///</summary>
[Category("UcPageControlByCode"),Description("单击分页按钮时发生")]
publiceventEventHandlerOnEventPageClicked;
#endregion
#region自定义属性
privateint_pageSize=50;//分页大小
privatestring_sqlWhereStatement=string.Empty;//MsSqlWhere语句
privatestring_sqlConnString=string.Empty;//MsSql数据库连接字符串
privatestring_tableName=string.Empty;//表名
privatestring_orderField=string.Empty;//数据表的排序字段
privatestring_primaryKey=string.Empty;//数据表的主键
privatestring_queryFieldList="*";//字段列表（默认为：*)
privateDataTable_pageTable=newDataTable();
///<summary>
///返回当前页码
///</summary>
publicintPageIndex
{
get
{
returnpageIndex+1;
}
}
///<summary>
///得到或设置分页大小(默认为:50)
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("得到或设置分页大小(默认为:50)")]
publicintPageSize
{
get
{
return_pageSize;
}
set
{
_pageSize=value;
}
}
///<summary>
///SQL语句的Where表达式
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到或设置SQL语句的Where表达式")]
publicstringSqlWhereStatement
{
get
{
return_sqlWhereStatement;
}
set
{
_sqlWhereStatement=value;
}
}
///<summary>
///得到或设置SqlServer的连接字符串
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到或设置SqlServer的连接字符串")]
publicstringSqlConnString
{
get
{
return_sqlConnString;
}
set
{
_sqlConnString=value;
}
}
///<summary>
///得到用户单击分页按钮后返回的DataTable
///</summary>
[Browsable(false),Category("UcPageControlByCode"),Description("得到用户单击分页按钮后返回的DataTable")]
publicDataTablePageTable
{
get
{
return_pageTable;
}
}
///<summary>
///设置或得到与分页控件绑定的表名或视图名
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到与分页控件绑定的表名或视图名")]
publicstringTableName
{
get
{
return_tableName;
}
set
{
_tableName=value;
}
}
///<summary>
///设置或得到分页控件排序字段
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件排序字段")]
publicstringOrderField
{
get
{
return_orderField;
}
set
{
_orderField=value;
}
}
///<summary>
///设置或得到分页控件绑定数据表的主键
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件绑定数据表的主键")]
publicstringPrimaryKey
{
get
{
return_primaryKey;
}
set
{
_primaryKey=value;
}
}
///<summary>
///设置或得到分页控件绑定的字段列表(默认为:*)
///</summary>
[Browsable(true),Category("UcPageControlByCode"),Description("设置或得到分页控件绑定的字段列表(默认为:*)")]
publicstringQueryFieldList
{
get
{
return_queryFieldList;
}
set
{
_queryFieldList=value;
}
}
#endregion
#region构造函数
///<summary>
///分页控件（使用代码实现，不用存储过程）
///</summary>
publicUcPageControlByCode()
{
InitializeComponent();
}
#endregion
#region分页实现相关代码
#regionvoidSetUcPageControlPars(stringconnStr,stringwhereStatement,stringtbName,stringorderField,stringprimaryKeyName,stringfieldList):给UcPageControlByCode控件传递必需参数
///<summary>
///给UcPageControlByCode控件传递必需参数
///</summary>
///<paramname="connStr">连接字符串</param>
///<paramname="whereStatement">MsSqlWhere语句</param>
///<paramname="tbName">数据表名或视力名</param>
///<paramname="orderField">排序字段</param>
///<paramname="primaryKeyName">主键值</param>
///<paramname="fieldList">字段列表(默认为:*)</param>
publicvoidSetUcPageControlPars(stringconnStr,stringwhereStatement,stringtbName
,stringorderField,stringprimaryKeyName,stringfieldList)
{
if(string.IsNullOrEmpty(connStr.Trim()))
{
DialogHelper.ShowErrorMsg("温馨提示：/n无可用的数据库连接！");
return;
}
else
{
this.SqlConnString=connStr;
}
this.SqlWhereStatement=whereStatement;
this.TableName=tbName;
this.OrderField=orderField;
this.PrimaryKey=primaryKeyName;
if(!string.IsNullOrEmpty(fieldList.Trim()))
{
this.QueryFieldList=fieldList;
}
}
#endregion
#regionDataTableInitializePageControl():初始化UcPageControlByCode
///<summary>
///绑定UcPageControlByCode(并返回包含当前页的DataTable)
///</summary>
///<returns>DataTable</returns>
publicDataTableBindPageControl()
{
recordCount=GetTotalRecordCount();//获取总记录数
pageCount=recordCount/PageSize-ModPage();//保存总页数（减去ModPage()函数防止SQL语句执行时溢出查询范围，可以用存储过程分页算法来理解这句）
pageIndex=0;//保存一个为0的页面索引值到pageIndex
lblPageCount.Text=(recordCount/PageSize+OverPage()).ToString();//显示lblpageCount、lblrecCount的状态
lblRecCount.Text=recordCount.ToString();
if(recordCount<=PageSize)
{
txtGoToPage.Enabled=false;
}
else
{
txtGoToPage.Enabled=true;
}
returnTDataBind();
}
#endregion
#region余页计算与总记录数
///<summary>
///计算余页
///</summary>
///<returns></returns>
privateintOverPage()
{
intreturnValue=0;
if(recordCount%PageSize!=0)
{
returnValue=1;
}
returnreturnValue;
}
///<summary>
///计算余页，防止SQL语句执行时溢出查询范围
///</summary>
///<returns></returns>
privateintModPage()
{
intreturnValue=0;
if(recordCount%PageSize==0&&recordCount!=0)
{
returnValue=1;
}
returnreturnValue;
}
///<summary>
///计算总记录数
///</summary>
///<returns>记录总数</returns>
privateintGetTotalRecordCount()
{
intreturnValue=0;
stringsqlStatement="selectcount(1)asrowsCountfrom"+TableName;
if(SqlWhereStatement.Trim().Length>0)
{
sqlStatement="selectcount(1)asrowsCountfrom"+TableName+"where"+SqlWhereStatement;
}
SqlDataReaderdr=null;
try
{
dr=DbHelperSQL.ExecuteReader(sqlStatement,SqlConnString);
if(dr.Read())
{
returnValue=Int32.Parse(dr["rowsCount"].ToString());
}
}
catch(Exceptionex)
{
DialogHelper.ShowErrorMsg(ex.Message);
}
finally
{
dr.Close();
dr.Dispose();
}
returnreturnValue;
}
#endregion
#regionDataTableTDataBind():数据绑定
privateDataTableTDataBind()
{
StringBuildersbSqlStatement=newStringBuilder();
boolisForward=pageIndex+1>1;
boolisBackward=(pageIndex!=pageCount);
btnFirstPage.Enabled=isForward;
btnPrevPage.Enabled=isForward;
btnNextPage.Enabled=isBackward;
btnLastPage.Enabled=isBackward;
if(string.IsNullOrEmpty(SqlWhereStatement.Trim()))
{
sbSqlStatement.Append("SELECTTOP"+PageSize+""+QueryFieldList+"FROM"+TableName+"WHERE"+PrimaryKey+"NOTIN(SELECTTOP");
sbSqlStatement.Append(PageSize*pageIndex+""+PrimaryKey+"FROM"+TableName);
sbSqlStatement.Append("ORDERBY"+OrderField+"DESC)ORDERBY"+OrderField+"DESC");
}
else
{
sbSqlStatement.Append("SELECTTOP"+PageSize+""+QueryFieldList+"FROM"+TableName+"WHERE"+SqlWhereStatement+"AND"+PrimaryKey+"NOTIN(SELECTTOP");
sbSqlStatement.Append(PageSize*pageIndex+""+PrimaryKey+"FROM"+TableName+"WHERE"+SqlWhereStatement+"ORDERBY"+OrderField+"DESC)ORDERBY"+OrderField+"DESC");
}
_pageTable=DbHelperSQL.Query(sbSqlStatement.ToString(),SqlConnString).Tables[0];
lblCurrentPage.Text=(pageIndex+1).ToString();
txtGoToPage.Text=(pageIndex+1).ToString();
return_pageTable;
}
#endregion
#region按钮事件代码
privatevoidbtnFirstPage_Click(objectsender,EventArgse)
{
pageIndex=0;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnPrevPage_Click(objectsender,EventArgse)
{
pageIndex--;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnNextPage_Click(objectsender,EventArgse)
{
pageIndex++;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnLastPage_Click(objectsender,EventArgse)
{
pageIndex=pageCount;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidtxtGoToPage_KeyDown(objectsender,KeyEventArgse)
{
if(e.KeyCode==Keys.Enter)
{
try
{
if(Int32.Parse(txtGoToPage.Text)>(recordCount/PageSize+OverPage())||Int32.Parse(txtGoToPage.Text)<=0)
{
DialogHelper.ShowWarningMsg("页码范围越界!");
txtGoToPage.Clear();
txtGoToPage.Focus();
}
else
{
pageIndex=Int32.Parse(txtGoToPage.Text.ToString())-1;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
}
catch(Exceptionex)//捕获由用户输入不正确数据类型时造成的异常
{
DialogHelper.ShowWarningMsg(ex.Message);
txtGoToPage.Clear();
txtGoToPage.Focus();
}
}
}
#endregion
#endregion
}
}
///<summary>
///计算余页
///</summary>
///<returns></returns>
privateintOverPage()
{
intreturnValue=0;
if(recordCount%PageSize!=0)
{
returnValue=1;
}
returnreturnValue;
}
///<summary>
///计算余页，防止SQL语句执行时溢出查询范围
///</summary>
///<returns></returns>
privateintModPage()
{
intreturnValue=0;
if(recordCount%PageSize==0&&recordCount!=0)
{
returnValue=1;
}
returnreturnValue;
}
///<summary>
///计算总记录数
///</summary>
///<returns>记录总数</returns>
privateintGetTotalRecordCount()
{
intreturnValue=0;
stringsqlStatement="selectcount(1)asrowsCountfrom"+TableName;
if(SqlWhereStatement.Trim().Length>0)
{
sqlStatement="selectcount(1)asrowsCountfrom"+TableName+"where"+SqlWhereStatement;
}
SqlDataReaderdr=null;
try
{
dr=DbHelperSQL.ExecuteReader(sqlStatement,SqlConnString);
if(dr.Read())
{
returnValue=Int32.Parse(dr["rowsCount"].ToString());
}
}
catch(Exceptionex)
{
DialogHelper.ShowErrorMsg(ex.Message);
}
finally
{
dr.Close();
dr.Dispose();
}
returnreturnValue;
}
#endregion
#regionDataTableTDataBind():数据绑定
privateDataTableTDataBind()
{
StringBuildersbSqlStatement=newStringBuilder();
boolisForward=pageIndex+1>1;
boolisBackward=(pageIndex!=pageCount);
btnFirstPage.Enabled=isForward;
btnPrevPage.Enabled=isForward;
btnNextPage.Enabled=isBackward;
btnLastPage.Enabled=isBackward;
if(string.IsNullOrEmpty(SqlWhereStatement.Trim()))
{
sbSqlStatement.Append("SELECTTOP"+PageSize+""+QueryFieldList+"FROM"+TableName+"WHERE"+PrimaryKey+"NOTIN(SELECTTOP");
sbSqlStatement.Append(PageSize*pageIndex+""+PrimaryKey+"FROM"+TableName);
sbSqlStatement.Append("ORDERBY"+OrderField+"DESC)ORDERBY"+OrderField+"DESC");
}
else
{
sbSqlStatement.Append("SELECTTOP"+PageSize+""+QueryFieldList+"FROM"+TableName+"WHERE"+SqlWhereStatement+"AND"+PrimaryKey+"NOTIN(SELECTTOP");
sbSqlStatement.Append(PageSize*pageIndex+""+PrimaryKey+"FROM"+TableName+"WHERE"+SqlWhereStatement+"ORDERBY"+OrderField+"DESC)ORDERBY"+OrderField+"DESC");
}
_pageTable=DbHelperSQL.Query(sbSqlStatement.ToString(),SqlConnString).Tables[0];
lblCurrentPage.Text=(pageIndex+1).ToString();
txtGoToPage.Text=(pageIndex+1).ToString();
return_pageTable;
}
#endregion
#region按钮事件代码
privatevoidbtnFirstPage_Click(objectsender,EventArgse)
{
pageIndex=0;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnPrevPage_Click(objectsender,EventArgse)
{
pageIndex--;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnNextPage_Click(objectsender,EventArgse)
{
pageIndex++;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidbtnLastPage_Click(objectsender,EventArgse)
{
pageIndex=pageCount;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
privatevoidtxtGoToPage_KeyDown(objectsender,KeyEventArgse)
{
if(e.KeyCode==Keys.Enter)
{
try
{
if(Int32.Parse(txtGoToPage.Text)>(recordCount/PageSize+OverPage())||Int32.Parse(txtGoToPage.Text)<=0)
{
DialogHelper.ShowWarningMsg("页码范围越界!");
txtGoToPage.Clear();
txtGoToPage.Focus();
}
else
{
pageIndex=Int32.Parse(txtGoToPage.Text.ToString())-1;
_pageTable=TDataBind();
if(OnEventPageClicked!=null)
{
OnEventPageClicked(this,null);
}
}
}
catch(Exceptionex)//捕获由用户输入不正确数据类型时造成的异常
{
DialogHelper.ShowWarningMsg(ex.Message);
txtGoToPage.Clear();
txtGoToPage.Focus();
}
}
}
#endregion
#endregion
}
}
分页控件使用实例
客户端使用代码如下：
1usingSystem;
2usingSystem.Collections.Generic;
3usingSystem.ComponentModel;
4usingSystem.Data;
5usingSystem.Drawing;
6usingSystem.Configuration;
7usingDotNet.Controls;
8usingSystem.Text;
9usingSystem.Windows.Forms;
10usingDotNet.Common;
11usingDotNet.WinForm.Utilities;
12
13namespaceDotNet.WinForm.Example
14{
15publicpartialclassFrmUcPageControlByCodeTest:Form
16{
17publicFrmUcPageControlByCodeTest()
18{
19InitializeComponent();
20}
21
22privatevoidFrmUcPageControlByCodeTest_Shown(objectsender,EventArgse)
23{
24//初始化方法一
25//ucPageControlByCode.SqlConnString=ConfigurationSettings.AppSettings["DbConnection"];
26//ucPageControlByCode.SqlWhereStatement="1=1";
27//ucPageControlByCode.TableName="tbTestData";
28//ucPageControlByCode.OrderField="UniqueID";
29//ucPageControlByCode.PrimaryKey="UniqueID";
30//ucPageControlByCode.QueryFieldList="*";
31
32//初始化方法二
33ucPageControlByCode.SetUcPageControlPars(ConfigurationSettings.AppSettings["DbConnection"],"1=1","tbTestData",
34"UniqueID","UniqueID","*");
35DataTabledtTest=newDataTable();
36dtTest=ucPageControlByCode.BindPageControl();
37ucDataGridView.DataSource=dtTest;
38
39//绑定查询项
40Dictionary<string,string>dicListQueryItems=newDictionary<string,string>();
41foreach(DataColumndcindtTest.Columns)
42{
43dicListQueryItems.Add(dc.ColumnName,dc.DataType.ToString());
44}
45ucCombinQuery1.SetQueryItems(dicListQueryItems);
46}
47
48privatevoiducDataGridView_DataBindingComplete(objectsender,DataGridViewBindingCompleteEventArgse)
49{
50gbMain.Text="当前共:"+ucDataGridView.Rows.Count.ToString()+"条数据。";
51}
52
53privatevoiducPageControlByCode_OnEventPageClicked(objectsender,EventArgse)
54{
55ucDataGridView.DataSource=null;
56ucDataGridView.DataSource=ucPageControlByCode.PageTable;
57}
58
59privatevoiducCombinQuery1_OnQueryClicked(objectsender,EventArgse)
60{
61try
62{
63Splasher.Show(typeof(FrmSplash));
64Splasher.Status="正在查找数据，请稍等...";
65System.Threading.Thread.Sleep(450);
66ucDataGridView.DataSource=null;
67ucPageControlByCode.SqlWhereStatement=ucCombinQuery1.QueryExpression;//指定查询表达式
68ucDataGridView.DataSource=ucPageControlByCode.BindPageControl();//绑定DataGridView
69}
70catch(Exceptionex)
71{
72ucPageControlByCode.SqlWhereStatement="1<>1";
73ucDataGridView.DataSource=ucPageControlByCode.BindPageControl();//绑定DataGridView
74Splasher.Status=ex.Message;
75System.Threading.Thread.Sleep(1000);
76}
77finally
78{
79System.Threading.Thread.Sleep(100);
80Splasher.Status="查找完毕...";
81Splasher.Close();
82}
83}
84}
85}
2usingSystem.Collections.Generic;
3usingSystem.ComponentModel;
4usingSystem.Data;
5usingSystem.Drawing;
6usingSystem.Configuration;
7usingDotNet.Controls;
8usingSystem.Text;
9usingSystem.Windows.Forms;
10usingDotNet.Common;
11usingDotNet.WinForm.Utilities;
12
13namespaceDotNet.WinForm.Example
14{
15publicpartialclassFrmUcPageControlByCodeTest:Form
16{
17publicFrmUcPageControlByCodeTest()
18{
19InitializeComponent();
20}
21
22privatevoidFrmUcPageControlByCodeTest_Shown(objectsender,EventArgse)
23{
24//初始化方法一
25//ucPageControlByCode.SqlConnString=ConfigurationSettings.AppSettings["DbConnection"];
26//ucPageControlByCode.SqlWhereStatement="1=1";
27//ucPageControlByCode.TableName="tbTestData";
28//ucPageControlByCode.OrderField="UniqueID";
29//ucPageControlByCode.PrimaryKey="UniqueID";
30//ucPageControlByCode.QueryFieldList="*";
31
32//初始化方法二
33ucPageControlByCode.SetUcPageControlPars(ConfigurationSettings.AppSettings["DbConnection"],"1=1","tbTestData",
34"UniqueID","UniqueID","*");
35DataTabledtTest=newDataTable();
36dtTest=ucPageControlByCode.BindPageControl();
37ucDataGridView.DataSource=dtTest;
38
39//绑定查询项
40Dictionary<string,string>dicListQueryItems=newDictionary<string,string>();
41foreach(DataColumndcindtTest.Columns)
42{
43dicListQueryItems.Add(dc.ColumnName,dc.DataType.ToString());
44}
45ucCombinQuery1.SetQueryItems(dicListQueryItems);
46}
47
48privatevoiducDataGridView_DataBindingComplete(objectsender,DataGridViewBindingCompleteEventArgse)
49{
50gbMain.Text="当前共:"+ucDataGridView.Rows.Count.ToString()+"条数据。";
51}
52
53privatevoiducPageControlByCode_OnEventPageClicked(objectsender,EventArgse)
54{
55ucDataGridView.DataSource=null;
56ucDataGridView.DataSource=ucPageControlByCode.PageTable;
57}
58
59privatevoiducCombinQuery1_OnQueryClicked(objectsender,EventArgse)
60{
61try
62{
63Splasher.Show(typeof(FrmSplash));
64Splasher.Status="正在查找数据，请稍等...";
65System.Threading.Thread.Sleep(450);
66ucDataGridView.DataSource=null;
67ucPageControlByCode.SqlWhereStatement=ucCombinQuery1.QueryExpression;//指定查询表达式
68ucDataGridView.DataSource=ucPageControlByCode.BindPageControl();//绑定DataGridView
69}
70catch(Exceptionex)
71{
72ucPageControlByCode.SqlWhereStatement="1<>1";
73ucDataGridView.DataSource=ucPageControlByCode.BindPageControl();//绑定DataGridView
74Splasher.Status=ex.Message;
75System.Threading.Thread.Sleep(1000);
76}
77finally
78{
79System.Threading.Thread.Sleep(100);
80Splasher.Status="查找完毕...";
81Splasher.Close();
82}
83}
84}
85}
最后的效果如下：
© 2011 EricHu
原创作品，转贴请注明作者和出处，留此信息。
------------------------------------------------
cnBlobs:http://www.cnblogs.com/huyong/
****：http://blog.****.net/chinahuyong
作者：EricHu（DB、C/S、B/S、WebService、WCF、PM等）
出处：http://www.cnblogs.com/huyong/
Q Q：80368704 E-Mail: [email protected]
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