原创asp.net2分页控件

惭愧,又失业了.......

自己做了个邮件系统,运用了webpart,ajax,FrontControl,Hibernate等技术,也算检验这段时间漫长的学习过程.

网上流行AspnetPager分页控件,我找不到最新版源码,所以自己动手写了一个.分布在blog上,或许也有人和我一样想法自己想做分页控件的,可以参考交流一下.

分页控件相当简易,甚至有点简陋,但跟HQL和GridView一起工作得相当好,而且代码很容易维护,扩展功能也很方便.

3个文件:

• EventArgs.cs 置于App_Code下.
• PageIndicator.ascx  控件
• PageIndicator.ascx.cs  代码文件

EventArgs.cs

//2006年[e-mail]原创
//http://blog.csdn.net/heguo

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;

//定义一个泛型的EventArgs
public class EventArgs<T> : EventArgs
...{
    private T value;

    public EventArgs(T value)
    ...{
        this.value = value;
    }

    public T Value
    ...{
        get ...{ return value; }
    }
}

 PageIndicator.ascx 

如果不用Ajax,需要去掉UpdatePanel相关的元

<%...@ Control Language="C#" AutoEventWireup="true" CodeFile="PageIndicator.ascx.cs" Inherits="PageIndicator" %>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <span
                            style="font-size: 9pt">
                <div style="width: 609px; height: 32px">
                  <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click" Font-Bold="False"
            Font-Italic="False" Font-Names="Webdings" Font-Size="11pt" CausesValidation="False" Font-Underline="False">9</asp:LinkButton>&nbsp;
        <asp:LinkButton ID="LinkButton2" runat="server" OnClick="LinkButton2_Click" CausesValidation="False" Font-Bold="False" Font-Italic="False" Font-Names="Webdings" Font-Size="11pt" Font-Underline="False">7</asp:LinkButton>&nbsp;
    
    <asp:Literal ID="Literal1" runat="server" Text="Literal"></asp:Literal>
                    <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
                    &nbsp; <asp:LinkButton ID="LinkButton3" runat="server" OnClick="LinkButton3_Click" CausesValidation="False" Font-Bold="False" Font-Italic="False" Font-Names="Webdings" Font-Size="11pt" Font-Underline="False">8</asp:LinkButton>
            <asp:LinkButton ID="LinkButton4" runat="server" OnClick="LinkButton4_Click" Font-Bold="False"
                Font-Names="Webdings" Font-Size="11pt" CausesValidation="False" Font-Italic="False" Font-Underline="False">:</asp:LinkButton><span style="font-size: 9pt">
                    &nbsp;&nbsp;
                    <asp:Literal ID="Literal2" runat="server" Text="Literal"></asp:Literal>
                </span><span style="font-size: 9pt">&nbsp;&nbsp;
                    <asp:LinkButton ID="LinkButton5" runat="server" OnClick="LinkButton5_Click" CausesValidation="False">转到</asp:LinkButton>第</span><asp:TextBox
                        ID="TextBox1" runat="server" BorderStyle="Groove" Width="27px" style="text-align:center;height:12px;width:20px;"></asp:TextBox><span
                            style="font-size: 9pt">页<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
                                runat="server" ControlToValidate="TextBox1" ErrorMessage="请输入数字" ValidationExpression="d*"></asp:RegularExpressionValidator>
                            </span></span></div>

                </div>
            </span>
        </ContentTemplate>
    </asp:UpdatePanel>
      

 

 PageIndicator.ascx.cs 

 

//2006年[e-mail]原创
//http://blog.csdn.net/heguo

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class PageIndicator : System.Web.UI.UserControl
...{
    private static readonly string itemCountKey = "ItemCount";
    private static readonly string currentPageIndex = "CurrentPageIndex";
    private static readonly string pageSize = "PageSize";
    private static readonly string indicatorCount = "IndicatorCount";
    private static readonly string tipFormat = "共{0}页{1}封邮件";
    private static readonly string createdFrom = "CreatedFrom";
    private static readonly string createdEnd = "CreatedEnd";

    public int IndicatorFrom
    ...{
        get
        ...{
            return CurrentPageIndex - (CurrentPageIndex - 1) % IndicatorCount;
        }
    }

    public int IndicatorCount
    ...{
        get ...{ return ViewState[indicatorCount] == null ? 5 : (int)ViewState[indicatorCount]; }
        set ...{ ViewState[indicatorCount] = value; }
    }


    public int ItemCount
    ...{
        get ...{ return ViewState[itemCountKey] == null ? 0 : (int)ViewState[itemCountKey]; }
    }

    public int PageSize
    ...{
        get ...{ return ViewState[pageSize] == null ? 10 : (int)ViewState[pageSize]; }
        set
        ...{
            ViewState[pageSize] = value > 0 ? value : 10;
        }
    }

    public int PageCount
    ...{
        get ...{ return ItemCount == 0?1: (ItemCount - 1) / PageSize + 1; }
    }

    public int CurrentPageFirstItemIndex
    ...{
        get ...{ return CurrentPageIndex * PageSize + 1; }
    }

    protected void LinkButton1_Click(object sender, EventArgs e)
    ...{
        this.SetPageIndex(1);
    }
    protected void LinkButton2_Click(object sender, EventArgs e)
    ...{
       this.SetPageIndex(CurrentPageIndex - 1);
    }
    protected void LinkButton3_Click(object sender, EventArgs e)
    ...{
        this.SetPageIndex(CurrentPageIndex + 1);
    }
    protected void LinkButton4_Click(object sender, EventArgs e)
    ...{
        this.SetPageIndex(PageCount);
    }
    protected void LinkButton5_Click(object sender, EventArgs e)
    ...{
        this.RegularExpressionValidator1.Validate();
        if (RegularExpressionValidator1.IsValid)
            this.SetPageIndex(int.Parse(TextBox1.Text));
        else
            this.SetPageIndex(1);
    }

    void Page_Init(object sender, EventArgs e)
    ...{
        
    }


    public int CurrentPageIndex
    ...{
        
        get ...{ return ViewState[currentPageIndex] == null ? 1 : (int)ViewState[currentPageIndex]; }
    }

    public void SetPageIndex(int pageIndex)
    ...{
        if (pageIndex < 1) pageIndex = 1;
        if (pageIndex > PageCount) pageIndex = PageCount;
        ViewState[currentPageIndex] = pageIndex;
        UpdatePanel1.Update();
        if (PageIndicatorChanged != null)
            PageIndicatorChanged(this, new EventArgs<int>(pageIndex));
    }

    protected void Page_Load(object sender, EventArgs e)
    ...{
        CreateLinkButtons(CreatedFrom, CreatedEnd);
    }

    protected void Page_PreRender(object sender, EventArgs e)
    ...{
        Literal2.Text = string.Format(tipFormat, PageCount, ItemCount);
        TextBox1.Text = CurrentPageIndex.ToString();
        Literal1.Text = string.Empty;
        CreateLinkButtons(IndicatorFrom, Math.Min(IndicatorFrom + IndicatorCount, PageCount + 1));
    }

    void CreateLinkButtons(int from,int end)
    ...{
        this.PlaceHolder1.Controls.Clear();
        for (int i = from; i < end; i++)
        ...{
            LinkButton linkbutton = new LinkButton();
            linkbutton.ID = "_link" + i.ToString();
            linkbutton.Text = i == CurrentPageIndex ? i.ToString() : "[" + i.ToString()+"]";
            linkbutton.CausesValidation = false;
            linkbutton.Click += new EventHandler(linkbutton_Click);
            this.PlaceHolder1.Controls.Add(linkbutton);
            Label l = new Label();
            l.Text = " ";
            l.ID = "_label" + i.ToString();
            this.PlaceHolder1.Controls.Add(l);
        }
        CreatedFrom = from;
        CreatedEnd = end;
    }

    int CreatedFrom
    ...{
        get ...{ return ViewState[createdFrom] == null ? 0 : (int)ViewState[createdFrom]; }
        set ...{ ViewState[createdFrom] = value; }
    }
    int CreatedEnd
    ...{
        get ...{ return ViewState[createdEnd] == null ? 0 : (int)ViewState[createdEnd]; }
        set ...{ ViewState[createdEnd] = value; }
    }
    void linkbutton_Click(object sender, EventArgs e)
    ...{
        LinkButton l = (LinkButton)sender;
        SetPageIndex(int.Parse(l.ID.Substring(5)));
    }

   //点击页号抛出的事件
    public event EventHandler<EventArgs<int>> PageIndicatorChanged;
   
   //检索数据前,需要知道记录总数
    public void Reset(int itemCount)
    ...{
        ViewState[itemCountKey] = itemCount; 
        this.SetPageIndex(1);
    }
}