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C# 分页asp.net/c时Gridview中复选框值的持久性#_C#_Asp.net_Gridview - Fatal编程技术网

C# 分页asp.net/c时Gridview中复选框值的持久性#

C# 分页asp.net/c时Gridview中复选框值的持久性#,c#,asp.net,gridview,C#,Asp.net,Gridview,我想在网格视图中显示的项目选择上保留复选框值 这是gridviewpage.aspx中创建gridview的代码: <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "False" Font-Names = "Arial" Font-Size = "

我想在网格视图中显示的项目选择上保留复选框值

这是gridviewpage.aspx中创建gridview的代码:

 <form id="form1" runat="server">
    <div>
       <asp:GridView ID="GridView1" runat="server" 
        AutoGenerateColumns = "False" Font-Names = "Arial" 
        Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B"  
        HeaderStyle-BackColor = "green" AllowPaging ="True"   
        OnPageIndexChanging = "OnPaging1xxx" OnRowDataBound = "RowDataBound" 
            AllowSorting="True" DataKeyNames="CustomerID" DataSourceID="SqlDataSource1" >
       <Columns>
        <asp:BoundField ItemStyle-Width = "150px" DataField = "CustomerID" 
               HeaderText = "CustomerID" ReadOnly="True" SortExpression="CustomerID" />
        <asp:BoundField ItemStyle-Width = "150px" DataField = "City" HeaderText = "City" 
               SortExpression="City"/>
        <asp:BoundField ItemStyle-Width = "150px" DataField = "Country" 
               HeaderText = "Country" SortExpression="Country"/>
        <asp:BoundField ItemStyle-Width = "150px" DataField = "PostalCode" 
               HeaderText = "PostalCode" SortExpression="PostalCode"/>
               <asp:TemplateField>
                <ItemTemplate>
                <asp:CheckBox id="CheckBox1" runat="server" onclick="Check_Click(this)"/>
                </ItemTemplate>
                <HeaderTemplate>
                <asp:CheckBox id="chkAll" runat="server" Text="Select All" onclick="checkAll(this)"/>
                </HeaderTemplate>
               </asp:TemplateField>
       </Columns> 
       <AlternatingRowStyle BackColor="#C2D69B"  />

<HeaderStyle BackColor="Green"></HeaderStyle>
    </asp:GridView> 
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="Data Source=SDANTURTHI-PC;Initial Catalog=ArticleDB;Integrated Security=True" 
            ProviderName="System.Data.SqlClient" 
            SelectCommand="SELECT [CustomerID], [City], [Country], [PostalCode] FROM [Customers]">
        </asp:SqlDataSource>
    </div>

这是gridviewpage.aspx.cs中的代码

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.Data.SqlClient;
using System.Collections;
using System.IO.Compression;  

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {        
        ArrayList CheckBoxArray;
        if (ViewState["CheckBoxArray"] != null)
        {
            CheckBoxArray = (ArrayList)ViewState["CheckBoxArray"];
        }
        else
        {
            CheckBoxArray = new ArrayList();
        }

        if (IsPostBack)
        {
            int CheckBoxIndex;
            bool CheckAllWasChecked=false;
            CheckBox chkAll = (CheckBox)GridView1.HeaderRow.Cells[4].FindControl("chkAll");
            string checkAllIndex = "chkAll-" + GridView1.PageIndex;
            if (chkAll.Checked)
            {                
                if (CheckBoxArray.IndexOf(checkAllIndex) == -1)
                {
                    CheckBoxArray.Add(checkAllIndex);
                }
            }
            else 
            {
                if (CheckBoxArray.IndexOf(checkAllIndex) != -1)
                {
                    CheckBoxArray.Remove(checkAllIndex);
                    CheckAllWasChecked = true;
                }
            }
            for (int i = 0; i < GridView1.Rows.Count; i++)
            {
                if (GridView1.Rows[i].RowType == DataControlRowType.DataRow)
                {
                    CheckBox chk = (CheckBox)GridView1.Rows[i].Cells[4].FindControl("CheckBox1");
                    CheckBoxIndex = GridView1.PageSize * GridView1.PageIndex + (i + 1);
                    if (chk.Checked)
                    {
                        if (CheckBoxArray.IndexOf(CheckBoxIndex) == -1 && !CheckAllWasChecked)
                        {
                            CheckBoxArray.Add(CheckBoxIndex);
                        }
                    }
                    else 
                    {
                        if (CheckBoxArray.IndexOf(CheckBoxIndex) != -1 || CheckAllWasChecked)
                        {
                            CheckBoxArray.Remove(CheckBoxIndex);
                        }
                    }
                }
            }
        }
       ViewState["CheckBoxArray"] = CheckBoxArray;

       GridView1.DataBind();
    }  

    protected void OnPaging1xxx(object sender, GridViewPageEventArgs e)
    {

        GridView1.PageIndex = e.NewPageIndex;
        GridView1.DataBind();
        if (ViewState["CheckBoxArray"] != null)
        {
            ArrayList CheckBoxArray = (ArrayList)ViewState["CheckBoxArray"];
            string checkAllIndex = "chkAll-" + GridView1.PageIndex;

            if (CheckBoxArray.IndexOf(checkAllIndex) != -1)
            {
                CheckBox chkAll = (CheckBox)GridView1.HeaderRow.Cells[4].FindControl("chkAll");
                chkAll.Checked = true;
            }
            for (int i = 0; i < GridView1.Rows.Count; i++)
            {

                if (GridView1.Rows[i].RowType == DataControlRowType.DataRow)
                {
                    if (CheckBoxArray.IndexOf(checkAllIndex) != -1)
                    {
                        CheckBox chk = (CheckBox)GridView1.Rows[i].Cells[4].FindControl("CheckBox1");
                        chk.Checked = true;
                        GridView1.Rows[i].Attributes.Add("style","background-color:aqua");      
                    }
                    else
                    {
                        int CheckBoxIndex = GridView1.PageSize * (GridView1.PageIndex) + (i + 1);
                        if (CheckBoxArray.IndexOf(CheckBoxIndex) != -1)
                        {
                            CheckBox chk = (CheckBox)GridView1.Rows[i].Cells[4].FindControl("CheckBox1");
                            chk.Checked = true;
                            GridView1.Rows[i].Attributes.Add("style", "background-color:aqua");
                        }
                    }
                }
            }
        }
    }
    protected void RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes.Add("onmouseover", "MouseEvents(this, event)");
            e.Row.Attributes.Add("onmouseout", "MouseEvents(this, event)");
        }
    }
}
使用系统;
使用系统数据;
使用系统配置;
使用System.Web;
使用System.Web.Security;
使用System.Web.UI;
使用System.Web.UI.WebControl;
使用System.Web.UI.WebControl.WebParts;
使用System.Web.UI.HTMLControl;
使用System.Data.SqlClient;
使用系统集合;
使用系统IO压缩;
公共部分类\u默认值:System.Web.UI.Page
{
受保护的无效页面加载(对象发送方、事件参数e)
{        
ArrayList CheckBoxArray;
如果(ViewState[“CheckBoxArray”]!=null)
{
CheckBoxArray=(ArrayList)视图状态[“CheckBoxArray”];
}
其他的
{
CheckBoxArray=newArrayList();
}
如果(iPostBack)
{
int-CheckBoxIndex;
bool CheckAllWasChecked=false;
复选框chkAll=(复选框)GridView1.HeaderRow.Cells[4]。FindControl(“chkAll”);
字符串checkAllIndex=“chkAll-”+GridView1.PageIndex;
如果(已勾选)
{                
if(CheckBoxArray.IndexOf(checkAllIndex)=-1)
{
添加(checkAllIndex);
}
}
其他的
{
if(CheckBoxArray.IndexOf(checkAllIndex)!=-1)
{
CheckBoxArray.Remove(checkAllIndex);
CheckAllWasChecked=true;
}
}
对于(int i=0;i

它无法持久化这些值,但当我调试checkboxarray和
viewstate[“checkboxarray”]
时,它们似乎拥有正确的值。我不明白为什么它不起作用。请帮帮我。感谢您的期待

请注意,ViewState仅在从服务器到浏览器的过程中“起作用”。你不能指望它还在邮筒背面

持久化它需要使用会话

编辑

任何要返回服务器的内容都需要将其放入表单中
->它将在请求中。表单[“blabla”]
或者在查询字符串中(mypage.aspx?blabla=somevalue)
->它将在请求中。QueryString[“blabla”]

这是将数据从服务器获取到页面的唯一两种方法

(增编:

当您的控件触发您在代码隐藏cs文件中处理的事件时,这会对您稍微隐藏。ASP.NET将控件包装在表单中