【ASP】ASP.Net 分页控件源码-Net-分页控件

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ASP.Net 分页控件源码

using System;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web;
using System.Web.UI;
using System.Text.RegularExpressions;

namespace MyCompany.Controls
{
/// <summary>
/// 分页控件
/// </summary>
public class Pager : Label, INamingContainer
{
#region 成员变量和构造函数
HttpContext context=HttpContext.Current;
Label countLabel;
HyperLink previousButton;
HyperLink nextButton;
HyperLink firstButton;
HyperLink lastButton;
HyperLink[] pagingLinkButtons;

public override ControlCollection Controls
{
get
{
EnsureChildControls();
return base.Controls;
}
}

protected override void CreateChildControls()
{
Controls.Clear();

AddCountLabel();

AddPageButtons();

AddPreviousNextHyperLinks();

AddFirstLastHyperLinks();
}
#endregion

#region 呈现方法
protected override void Render(HtmlTextWriter writer)
{
// 修改总页数小于等于1的时候不呈现任何控件
// int totalPages=CalculateTotalPages();
//
// if (totalPages <=1)
// return;

AddAttributesToRender(writer);

writer.AddAttribute(HtmlTextWriterAttribute.Class, this.CssClass, false);

RenderCountLabel(writer);

RenderFirst(writer);

RenderPrevious(writer);

RenderPagingButtons(writer);

RenderNext(writer);

RenderLast(writer);
}

void RenderCountLabel(HtmlTextWriter writer)
{
countLabel.RenderControl(writer);

LiteralControl l=new LiteralControl(" ");
l.RenderControl(writer);
}

void RenderFirst (HtmlTextWriter writer)
{
firstButton.RenderControl(writer);

LiteralControl l=new LiteralControl(" ");
l.RenderControl(writer);
}

void RenderLast (HtmlTextWriter writer)
{
lastButton.RenderControl(writer);

LiteralControl l=new LiteralControl(" ");
l.RenderControl(writer);
}

void RenderPrevious (HtmlTextWriter writer)
{
previousButton.RenderControl(writer);

LiteralControl l=new LiteralControl(" ");
l.RenderControl(writer);
}

void RenderNext(HtmlTextWriter writer)
{
nextButton.RenderControl(writer);

LiteralControl l=new LiteralControl(" ");
l.RenderControl(writer);
}

private void RenderButtonRange(int start, int end, HtmlTextWriter writer)
{
for (int i=start; i < end; i++)
{
if (PageIndex==i)
{
Literal l=new Literal();
l.Text="<font color=red>" + (i + 1).ToString() + "</font>";

l.RenderControl(writer);
}
else
{
pagingLinkButtons.RenderControl(writer);
}
if (i < (end - 1))
writer.Write(" ");
}

LiteralControl l1=new LiteralControl(" ");
l1.RenderControl(writer);
}

private void RenderPagingButtons(HtmlTextWriter writer)
{
int totalPages;

totalPages=CalculateTotalPages();

if (totalPages <=10)
{
RenderButtonRange(0, totalPages, writer);
}
else
{
int lowerBound=(PageIndex - 4);
int upperBount=(PageIndex + 6);

if (lowerBound <=0)
lowerBound=0;

if (PageIndex <=4)
RenderButtonRange(0, 10, writer);

else if (PageIndex < (totalPages - 5))
RenderButtonRange(lowerBound, (PageIndex + 6), writer);

else if (PageIndex >=(totalPages - 5))
RenderButtonRange((totalPages - 10), totalPages, writer);
}
}

#endregion

#region 控件树方法
/// <summary>
/// 信息标签
/// </summary>
void AddCountLabel()
{
countLabel=new Label();
countLabel.ID="countLabel";
countLabel.Text=string.Format(text, CalculateTotalPages().ToString("n0"));

Controls.Add(countLabel);
}

private void AddPageButtons()
{
pagingLinkButtons=new HyperLink[CalculateTotalPages()];

for (int i=0; i < pagingLinkButtons.Length; i++)
{
pagingLinkButtons=new HyperLink();
pagingLinkButtons.EnableViewState=false;
pagingLinkButtons.Text=(i + 1).ToString();
pagingLinkButtons.ID=i.ToString();
pagingLinkButtons.CssClass=linkCss;
pagingLinkButtons.NavigateUrl=GetHrefString(i);

Controls.Add(pagingLinkButtons);
}
}

/// <summary>
/// 首页末页
/// </summary>
void AddFirstLastHyperLinks()
{
firstButton=new HyperLink();
firstButton.ID="First";
firstButton.Text="首页";
if(PageIndex !=0 && CalculateTotalPages() > 0)
{
firstButton.NavigateUrl=GetHrefString(0);
}
else
{
firstButton.Enabled=false;
}

Controls.Add(firstButton);

lastButton=new HyperLink();
lastButton.ID="Last";
lastButton.Text="末页";
if(PageIndex !=CalculateTotalPages() - 1)
{
lastButton.NavigateUrl=GetHrefString(CalculateTotalPages() - 1);
}
else
{
lastButton.Enabled=false;
}
Controls.Add(lastButton);
}

/// <summary>
/// 上一页下一页
/// </summary>
void AddPreviousNextHyperLinks()
{
previousButton=new HyperLink();
previousButton.ID="Prev";
previousButton.Text="上一页";
if (HasPrevious)
{
previousButton.NavigateUrl=GetHrefString(PageIndex - 1);
}
else
{
previousButton.Enabled=false;
}
Controls.Add(previousButton);

nextButton=new HyperLink();
nextButton.ID="Next";
nextButton.Text="下一页";
if(HasNext)
{
nextButton.NavigateUrl=GetHrefString(PageIndex + 1);
}
else
{
nextButton.Enabled=false;
}
Controls.Add(nextButton);
}
#endregion

#region 私有属性
private bool HasPrevious
{
get
{
if (PageIndex > 0)
return true;

return false;
}
}

private bool HasNext
{
get
{
if (PageIndex + 1 < CalculateTotalPages() )
return true;

return false;
}
}
#endregion

#region 帮助方法和公共属性

/// <summary>
/// 获取分页导航按钮的超链接字符串
/// </summary>
/// <param name="pageIndex">该分页按钮相对应的页索引</param>
/// <returns>分页导航按钮的超链接字符串</returns>
private string GetHrefString(int pageIndex)
{
string url=Page.Request.RawUrl;

if (Regex.IsMatch(url, @"(\d+).shtml", RegexOptions.IgnoreCase))
{
url=Regex.Replace(url, @"(\d+).shtml", pageIndex + ".shtml");
}

if (Regex.IsMatch(url, @"PageIndex=(\d+)", RegexOptions.IgnoreCase))
{
url=Regex.Replace(url, @"PageIndex=(\d+)", "PageIndex=" + pageIndex.ToString());
}

return Page.Server.UrlPathEncode(url);
}

public int CalculateTotalPages()
{
int totalPagesAvailable;

if (TotalRecords==0)
return 0;

totalPagesAvailable=TotalRecords / PageSize;

if ((TotalRecords % PageSize) > 0)
totalPagesAvailable++;

return totalPagesAvailable;
}

/// <summary>
/// 当前页
/// </summary>
public int PageIndex
{
get
{
int _pageIndex=0;

if ((!Page.IsPostBack) && (context.PageIndex > 0))
_pageIndex=context.PageIndex;
else
_pageIndex=Convert.ToInt32(ViewState["PageIndex"]);

if (_pageIndex < 0)
return 0;
else
{
if (_pageIndex > CalculateTotalPages()-1)
return CalculateTotalPages()-1;
else
return _pageIndex;
}
}
set
{
ViewState["PageIndex"]=value;
}
}

/// <summary>
/// 每页记录数
/// </summary>
public int PageSize
{
get
{
int pageSize=Convert.ToInt32(ViewState["PageSize"]);

if (pageSize==0)
{
return 10;
}

return pageSize;
}
set
{
ViewState["PageSize"]=value;
}

}

/// <summary>
/// 总记录数
/// </summary>
public int TotalRecords
{
get
{
return Convert.ToInt32(ViewState["TotalRecords"]);
}
set
{
ViewState["TotalRecords"]=value;
}
}

private string text="共{0}页";

private string linkCss="";
/// <summary>
/// 链接样式
/// </summary>
public string LinkCss
{
get { return linkCss; }
set { linkCss=value;}
}

private string textCss="";
/// <summary>
/// 文字样式
/// </summary>
public string TextCss
{
get { return textCss; }
set { textCss=value;}
}

public string TextFormat
{
get
{
return text;
}
set
{
text=value;
}
}

#endregion
}
}

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