asp.net自定义分页控件

控件代码：

using  System;
using  System.Data;
using  System.Configuration;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;
using  System.ComponentModel;
using  System.Collections;

namespace  SmartPager
... {
    /**/

          /// <summary>
       ///名称:SmartPager
       ///版本:2.0
       ///作者:小青青
       ///CopyRight:2006 请勿用作商业用途
    /// </summary>
    [DefaultEvent("PageIndexChanged"), ToolboxData("<{0}:SmartPager runat=server></{0}:SmartPager>")]
    public class SmartPager : System.Web.UI.WebControls.WebControl, INamingContainer
    ...{
        TextBox txtNewPageNumber;
        LinkButton lnkPrev;
        LinkButton lnkNext;
        LinkButton lnkFirst;
        LinkButton lnkLast;
        LinkButton lnkGo;
        Label lblCurrentPage;
        public delegate void PageChangedEventHandler(Object source, PageChangedEventArgs e);
        public event PageChangedEventHandler PageIndexChanged;
        private int _PageSize;
        private int _CurrentPageIndex;
        private int _VirtualItemCount;

        public SmartPager()
            : base(HtmlTextWriterTag.Div)
        ...{ }

        protected override void OnInit(EventArgs e)
        ...{

            txtNewPageNumber = new TextBox();
            lnkPrev = new LinkButton();
            lnkNext = new LinkButton();
            lnkFirst = new LinkButton();
            lnkLast = new LinkButton();
            lnkGo = new LinkButton();
            lblCurrentPage = new Label();
            EnsureChildControls();

        }
        protected override void CreateChildControls()
        ...{

            this.Controls.Add(lnkFirst);
            this.Controls.Add(lnkPrev);
            this.Controls.Add(lblCurrentPage);
            this.Controls.Add(txtNewPageNumber);
            this.Controls.Add(lnkGo);
            this.Controls.Add(lnkNext);
            this.Controls.Add(lnkLast);


            txtNewPageNumber.Width = 20;

            lnkFirst.Attributes.Add("title", "首页");
            lnkPrev.Attributes.Add("title", "上一页");
            lnkNext.Attributes.Add("title", "下一页");
            lnkLast.Attributes.Add("title", "末页");
            lnkGo.Attributes.Add("title", "转到");

            lnkFirst.Font.Name = "Webdings";
            lnkPrev.Font.Name = "Webdings";
            lnkNext.Font.Name = "Webdings";
            lnkLast.Font.Name = "Webdings";
            lnkGo.Font.Name = "Webdings";

            lnkPrev.Text = "7";
            lnkFirst.Text = "9";
            lnkNext.Text = "8";
            lnkLast.Text = ":";
            lnkGo.Text = "4";


            lnkGo.Click += new EventHandler(lnkGo_Click);
            lnkPrev.Click += new EventHandler(lnkPrev_Click);
            lnkNext.Click += new EventHandler(lnkNext_Click);
            lnkFirst.Click += new EventHandler(lnkFirst_Click);
            lnkLast.Click += new EventHandler(lnkLast_Click);

            base.CreateChildControls();


        }
        [Browsable(false)]

        public int PageCount
        ...{

            get
            ...{

                try
                ...{

                    if (VirtualItemCount % PageSize > 0)
                    ...{

                        return VirtualItemCount / PageSize + 1;

                    }
                    else
                    ...{

                        return VirtualItemCount / PageSize;

                    }
                }
                catch
                ...{
                    return 0;
                }
            }


        }
        public void SetPage(int pageIndex)
        ...{

            CurrentPageIndex = pageIndex;

            if (pageIndex > PageCount || pageIndex < 0)

                return;

            else
            ...{

                OnPageIndexChanged(null, new PageChangedEventArgs(null, pageIndex));

            }
        }
        public void SetPage(int pageIndex, int pageSize, int virtualItemCount)
        ...{

            _CurrentPageIndex = pageIndex;

            _PageSize = pageSize;

            _VirtualItemCount = virtualItemCount;

            if (pageIndex > PageCount || pageIndex < 0)

                return;

            else
            ...{

                OnPageIndexChanged(null, new PageChangedEventArgs(null, pageIndex));


            }
        }
        [Browsable(false)]
        public int PageSize
        ...{

            get
            ...{

                return _PageSize;

            }
            set
            ...{


                _PageSize = value;
                ViewState.SetItemDirty("PageSize", true);


            }

        }
        [Browsable(false)]
        public int CurrentPageIndex
        ...{

            get
            ...{

                return _CurrentPageIndex;

            }
            set
            ...{


                _CurrentPageIndex = value;
                ViewState.SetItemDirty("CurrentPageIndex", true);



            }

        }
        [Browsable(false)]
        public int VirtualItemCount
        ...{

            get
            ...{

                return _VirtualItemCount;

            }
            set
            ...{


                _VirtualItemCount = value;
                ViewState.SetItemDirty("VirtualItemCount", true);


            }

        }

        private void lnkGo_Click(object sender, EventArgs e)
        ...{

            int newPage;

            try
            ...{
                newPage = int.Parse(txtNewPageNumber.Text.Trim()) - 1;
            }
            catch
            ...{

                return;

            }

            if (PageCount > newPage && PageCount != 0)
                OnPageIndexChanged(this, new PageChangedEventArgs(sender, newPage));

        }

        public virtual void OnPageIndexChanged(object source, PageChangedEventArgs e)
        ...{

            DateTime start = DateTime.Now;

            if (e.NewPageIndex > PageCount || e.NewPageIndex < 0)

                return;

            else
            ...{

                CurrentPageIndex = e.NewPageIndex;

                if (PageIndexChanged != null)
                ...{

                    PageIndexChanged(source, e);


                }

                DateTime end = DateTime.Now;

                lblCurrentPage.Text = String.Format("(当前在第<B>&nbsp;{0}&nbsp;</B>页 共<B>&nbsp;{1}&nbsp;</B>页 记录数<B>&nbsp;{2}&nbsp;</B>条&nbsp;[搜索用时 {3}秒])", (CurrentPageIndex + 1), PageCount, VirtualItemCount, (end - start).TotalSeconds);

                txtNewPageNumber.Text = (CurrentPageIndex + 1).ToString();


            }

        }

        private void lnkPrev_Click(object sender, EventArgs e)
        ...{

            int newPage;

            newPage = CurrentPageIndex - 1;
            if (newPage >= 0 && PageCount != 0)
                OnPageIndexChanged(this, new PageChangedEventArgs(sender, newPage));

        }
        private void lnkFirst_Click(object sender, EventArgs e)
        ...{

            int newPage;

            newPage = 0;
            if (newPage >= 0 && PageCount != 0)
                OnPageIndexChanged(this, new PageChangedEventArgs(sender, newPage));

        }
        private void lnkLast_Click(object sender, EventArgs e)
        ...{

            int newPage;

            newPage = PageCount - 1;
            if (PageCount > newPage && PageCount != 0)
                OnPageIndexChanged(this, new PageChangedEventArgs(sender, newPage));

        }

        private void lnkNext_Click(object sender, EventArgs e)
        ...{

            int newPage;

            newPage = CurrentPageIndex + 1;
            if (PageCount > newPage && PageCount != 0)
                OnPageIndexChanged(this, new PageChangedEventArgs(sender, newPage));

        }


        protected override object SaveViewState()
        ...{
            // Check whether the PageSize property exists in 
            // the ViewState property, and if it does, check
            // whether it has changed since the most recent
            // TrackViewState method call.
            if (!((IDictionary)ViewState).Contains("PageSize") || ViewState.IsItemDirty("PageSize"))
            ...{
                ViewState.Remove("PageSize");
                // Add the _PageSize property to the StateBag.
                ViewState.Add("PageSize", _PageSize);
            }
            if (!((IDictionary)ViewState).Contains("CurrentPageIndex") || ViewState.IsItemDirty("CurrentPageIndex"))
            ...{
                ViewState.Remove("CurrentPageIndex");
                // Add the _CurrentPageIndex property to the StateBag.
                ViewState.Add("CurrentPageIndex", _CurrentPageIndex);
            }
            if (!((IDictionary)ViewState).Contains("VirtualItemCount") || ViewState.IsItemDirty("VirtualItemCount"))
            ...{
                ViewState.Remove("VirtualItemCount");
                // Add the _VirtualItemCount property to the StateBag.
                ViewState.Add("VirtualItemCount", _VirtualItemCount);
            }
            return ((IStateManager)ViewState).SaveViewState();
        }
        protected override void LoadViewState(object savedState)
        ...{
            if (savedState != null)
                ((IStateManager)ViewState).LoadViewState(savedState);
            if (ViewState["CurrentPageIndex"] != null)
                _CurrentPageIndex = int.Parse(ViewState["CurrentPageIndex"].ToString());
            if (ViewState["PageSize"] != null)
                _PageSize = int.Parse(ViewState["PageSize"].ToString());
            if (ViewState["VirtualItemCount"] != null)
                _VirtualItemCount = int.Parse(ViewState["VirtualItemCount"].ToString());

        }

        public class PageChangedEventArgs : EventArgs
        ...{
            
            // Fields
            private object commandSource;
            private int newPageIndex;

            public PageChangedEventArgs(object commandSource, int newPageIndex)
            ...{
                this.commandSource = commandSource;
                this.newPageIndex = newPageIndex;
            }
            // Properties
            public object CommandSource
            ...{
                get
                ...{
                    return this.commandSource;
                }
            }
            public int NewPageIndex
            ...{
                get
                ...{
                    return this.newPageIndex;
                }
            }
        
        }

    }

}

 

•  通过后台，使用SmartPager转向页面

 

int  goToPageIndex  =   0 ; // 转向的页码，索引从0开始，0代表第一页
int  pageSize  =   int .Parse(ConfigurationManager.AppSettings[ " PageSize " ]);
int  virtualItemCount  =  GetData(); // 从数据库中得到要查询的记录总数
pager.SetPage(goToPageIndex , pageSize, virtualItemCount );

// 如果试图转向到一个超过最大页面索引的页面，它将不会抛出异常。结果为无效操作!

 

•  订阅事件PageIndexChanged

 

protected   void  pager_PageIndexChanged( object  source, SmartPager.PageChangedEventArgs e)
         ... {

            //绑定数据源，数据容器可以为GridView,DataGrid等
           //为了提高数据库效率，后台应使用带有StartRecord和MaxRecords参数的方法
            string searchKey=null;//查询关键字

            gvItem.DataSource = GetDataList(searchKey,e.NewPageIndex * pageSize, pageSize);//根据业务需要自定义的获取数据的方法

            gvItem.DataBind();


        }

http://blog.youkuaiyun.com/justinalucard/archive/2006/12/22/1453194.aspx

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