asp.net web 自定义控件

0.调用代码

protected override void Page_Load(object sender, EventArgs e)
{
//给基类服务接口复制，可不付
if (IsPostBack)
{
if (Session["ReportTable3.Dev.Session"] != null)
{
var dt = (System.Data.DataSet)Session["ReportTable3.Dev.Session"];
ASPxGridView1.DataSource = dt;
ASPxGridView1.DataBind();
}
}

//1.这里AfterSelect 是个委托对象，继承多播委托，这里是在注册，最终执行委托的时候会把委托的内容逐一执行一遍，+=也可称为为委托注册方法实例
this.MyPageBar1.AfterSelect += MyPageBar1_AfterSelect;

base.Page_Load(sender, e);
}

//2.委托方法或者成为委托内容 注册的方法并不会马上执行，事件需要触发，可以传递sender对象和事件参数 e

private void MyPageBar1_AfterSelect(object sender, UserControls.SelectEventArgs e)
{

ASPxGridView1.DataSource = e.DataSource;
ASPxGridView1.DataBind();
}

1.先上核心代码 .ascx.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Web;
using DevExpress.XtraPrinting.Native;
using Framework;

namespace HraWeb.UserControls
{
public partial class MyPageBar : System.Web.UI.UserControl
{
public delegate void BegBindDataEventHandler(object sender, SelectEventArgs e);
public event BegBindDataEventHandler AfterSelect;
private Contract.IService.IDaoService _dao;
/// <summary>
/// 通用数据库操作
/// </summary>
public virtual Contract.IService.IDaoService Dao
{
get
{
if (_dao == null)
_dao = (Contract.IService.IDaoService)ctx["DaoService"];
return _dao;
}
}
private Spring.Context.IApplicationContext _ctx;
protected Spring.Context.IApplicationContext ctx
{
get
{
if (_ctx == null)
_ctx = Spring.Context.Support.ContextRegistry.GetContext();
return _ctx;
}
}

private int TotalBlock
{
get { return (PageCount - 1)/unitQ + 1; }
}

public object DataSource
{
get;
set;
}

private int _pageCount;

private int PageCount
{
get
{
_pageCount = (TotalCount - 1)/PageSize + 1;
return _pageCount;
}
set { _pageCount = value; }
}

public int TotalCount { get; set; }

private int PageIndex { get; set; }
public int PageSize { get; set; }

public ASPxGridView ViewSource { get; set; }

public void GridDataBind()
{
if (SearchInfo != null)
{
Session["SearchInfo"] = SearchInfo;
}
if (TotalCount != 0)
{
Session["TotalCount"] = TotalCount;
TotalCount = (int) Session["TotalCount"];

Session["PageCount"] = PageCount;

Session["TotalBlock"] = TotalBlock;
}
int currentBlock = 0;
if (Session["CurrentBlock"] != null)
{
currentBlock = (int) Session["CurrentBlock"];
}
else
{
currentBlock = this.CurrentBlock;
}
LoadBlock(currentBlock);
if (Session["CurrNum"] != null)
{
((LinkButton)Session["CurrNum"]).Enabled = false;
}
if (Session["SearchInfo"] != null)
{
SearchInfo = (QueryInfo)Session["SearchInfo"];
SearchInfo.PageSize = PageSize;
SearchInfo.StartRecord = (PageIndex - 1) * PageSize;
SearchInfo.TotalCount = 1;
}

if (Session["ViewSource"] == null)
{
Session["ViewSource"] = ViewSource;
}
else
{
ViewSource = (ASPxGridView)Session["ViewSource"];
}
DataTable dt = Dao.ExcuteDataSet(SearchInfo).Tables[0];

var onAfterSelect = this.AfterSelect;
onAfterSelect?.Invoke(this, new SelectEventArgs(dt));

}

public QueryInfo SearchInfo { get; set; }

protected void Page_Load(object sender, EventArgs e)
{
CurrentBlock = 1;
PageIndex = PageIndex == 0 ? 1 : PageIndex;
PageSize = PageSize == 0 ? 6 : PageSize;
Controls.Add("1", LinkButton1);
Controls.Add("2", LinkButton2);
Controls.Add("3", LinkButton3);
Controls.Add("4", LinkButton4);
Controls.Add("5", LinkButton5);
Controls.Add("6", LinkButton6);
}

public void Btn_Change(object sender)
{
for (int i = 0; i < Controls.Count; i++)
{
Controls[(i + 1).ToString()].Enabled = true;
}
LinkButton btn = (sender as LinkButton);
if (btn != null)
{
btn.Enabled = false;
PageIndex = int.Parse(btn.Text);
CurrNum = btn.Text;
Session["CurrNum"] = btn;
GridDataBind();

}
}

/// <summary>
/// 1
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void LinkButton1_Click(object sender, EventArgs e)
{
Btn_Change(sender);
}
/// <summary>
/// 2
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void LinkButton2_Click(object sender, EventArgs e)
{
Btn_Change(sender);

}
/// <summary>
/// 3
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void LinkButton3_Click(object sender, EventArgs e)
{
Btn_Change(sender);
}

/// <summary>
/// 4
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>

protected void LinkButton4_Click(object sender, EventArgs e)
{
Btn_Change(sender);
}
/// <summary>
/// 5
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void LinkButton5_Click(object sender, EventArgs e)
{
Btn_Change(sender);
}
/// <summary>
/// 6
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void LinkButton6_Click(object sender, EventArgs e)
{
Btn_Change(sender);
}

public int CurrentBlock { get; set; }
private string CurrNum;
private void LoadBlock(int CurrentBlock)
{

for (int i = 0; i < Controls.Count; i++)
{
Controls[(i + 1).ToString()].Enabled = true;
Controls[(i + 1).ToString()].Visible = false;
}
int start = (CurrentBlock - 1) * unitQ + 1;
int end = 0;
for (int i = 0; i < unitQ; i++)
{
end = start + i;
int pages;
if (Session["PageCount"] != null)
{
pages = (int) Session["PageCount"];
}
else
{
pages = PageCount;
}
if (end <= pages)
{
Controls[(i + 1).ToString()].Text = end.ToString();
Controls[(i + 1).ToString()].Visible = true;
}

}
}

protected void ImageButtonPre_Click(object sender, ImageClickEventArgs e)
{

int currentBlock = 0;
if (Session["CurrentBlock"] != null)
{
currentBlock = (int)Session["CurrentBlock"];
}
else
{
currentBlock = CurrentBlock;
}

if (currentBlock >1)
{
currentBlock--;
Session["CurrentBlock"] = currentBlock;
}

if (currentBlock <1)
{
return;
}
GridDataBind();

}

public int unitQ = 5;

public Dictionary<string, LinkButton> Controls = new Dictionary<string, LinkButton>();
protected void ImageButtonNext_Click(object sender, ImageClickEventArgs e)
{

int totalBlock = (int)Session["TotalBlock"];
int currentBlock = 0;
if (Session["CurrentBlock"] != null)
{
currentBlock = (int)Session["CurrentBlock"];
}
else
{
currentBlock = CurrentBlock;
}

if (currentBlock < totalBlock)
{
currentBlock++;
Session["CurrentBlock"] = currentBlock;
}

if (currentBlock > totalBlock)
{
return;
}
GridDataBind();

}
}
public class SelectEventArgs : EventArgs
{
private DataTable _dataSource = null;
public DataTable DataSource
{
get { return _dataSource; }
}

public SelectEventArgs(DataTable data)
{
_dataSource = data;
}
}

}

2.再上前台代码，没什么东西看看而已

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="MyPageBar.ascx.cs" Inherits="HraWeb.UserControls.MyPageBar" %>

<asp:ImageButton ID="ImageButtonPre" runat="server" Height="20px" ImageUrl="~/images/previous.png" Width="20px" OnClick="ImageButtonPre_Click" />
<asp:LinkButton ID="LinkButton1" Text="1" runat="server" OnClick="LinkButton1_Click">1</asp:LinkButton>
<asp:LinkButton ID="LinkButton2" Text="2" runat="server" OnClick="LinkButton2_Click">2</asp:LinkButton>
<asp:LinkButton ID="LinkButton3" Text="3" runat="server" OnClick="LinkButton3_Click">3</asp:LinkButton>
<asp:LinkButton ID="LinkButton4" Text="4" runat="server" OnClick="LinkButton4_Click">4</asp:LinkButton>
<asp:LinkButton ID="LinkButton5" Text="5" runat="server" OnClick="LinkButton5_Click">5</asp:LinkButton>
<asp:LinkButton ID="LinkButton6" Text="6" runat="server" OnClick="LinkButton6_Click">6</asp:LinkButton>
<asp:ImageButton ID="ImageButtonNext" runat="server" ImageUrl="~/images/next.png" Height="20px" Width="20px" OnClick="ImageButtonNext_Click" ViewStateMode="Enabled" />

3.设计器代码（自动生成可以不用管）

//------------------------------------------------------------------------------
// <自动生成>
// 此代码由工具生成。
//
// 对此文件的更改可能导致不正确的行为，如果
// 重新生成代码，则所做更改将丢失。
// </自动生成>
//------------------------------------------------------------------------------

namespace HraWeb.UserControls {

public partial class MyPageBar {

/// <summary>
/// ImageButtonPre 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.ImageButton ImageButtonPre;

/// <summary>
/// LinkButton1 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton1;

/// <summary>
/// LinkButton2 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton2;

/// <summary>
/// LinkButton3 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton3;

/// <summary>
/// LinkButton4 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton4;

/// <summary>
/// LinkButton5 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton5;

/// <summary>
/// LinkButton6 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.LinkButton LinkButton6;

/// <summary>
/// ImageButtonNext 控件。
/// </summary>
/// <remarks>
/// 自动生成的字段。
/// 若要进行修改，请将字段声明从设计器文件移到代码隐藏文件。
/// </remarks>
protected global::System.Web.UI.WebControls.ImageButton ImageButtonNext;
}
}