在DataGrid分页删除操作中出错啦！

Question

我在DataGrid分页删除操作中老出现如下错误，该怎么办啊？？
请高手帮忙啊！
出现错误：索引超出范围。必须为非负值并小于集合大小。参数名: index

Answer 1

.CS页：using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace DataGridTest
{
/// <summary>
/// ZhuCongTable 的摘要说明。
/// </summary>
public class ZhuCongTable : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid dgPar;
protected System.Web.UI.WebControls.DataGrid dgSub;
protected   String   ConnString   =   "Server=.;Uid=sa;Pwd=;Database=test"; private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
this.BindData();
// this.BindToDataGrid();
}
} private   void   BindData()   
{   
SqlDataAdapter   adapter   =   new   SqlDataAdapter("select   *   from   Employees",   ConnString);   
DataTable   dt   =   new   DataTable();   
adapter.Fill(dt);   
dgPar.DataSource   =   dt;   
dgPar.DataBind();   
}    //   获取子表数据并填充另外一个DataGrid   
private   void   GetSubDataBind(string   id)   
{   
string   subQuery   =   "select   *   from   Orders   where   EmployeeID=@EmployeeID";   
SqlDataAdapter   adapter   =   new   SqlDataAdapter(subQuery,   ConnString);   
adapter.SelectCommand.Parameters.Add("@EmployeeID",   SqlDbType.Int);   
adapter.SelectCommand.Parameters["@EmployeeID"].Value   =   id;   
DataTable   dt   =   new   DataTable();   
adapter.Fill(dt);   
dgSub.DataSource   =   dt;   
dgSub.DataBind();   
}    private void BindToDataGrid()
{
SqlConnection con=DB.createCon();
SqlDataAdapter sda=new SqlDataAdapter();
sda.SelectCommand=new SqlCommand("select * from Orders where   EmployeeID=@EmployeeID", con);
DataSet ds=new DataSet();
sda.Fill(ds,"Orders");
this.dgSub.DataKeyField="OrderID";
this.dgSub.DataSource=ds.Tables["Orders"];
this.dgSub.DataBind();
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{    
this.dgPar.SelectedIndexChanged += new System.EventHandler(this.dgPar_SelectedIndexChanged);
this.dgSub.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.dgSub_PageIndexChanged);
this.dgSub.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgSub_CancelCommand);
this.dgSub.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgSub_EditCommand);
this.dgSub.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgSub_UpdateCommand);
this.dgSub.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.dgSub_DeleteCommand);
this.dgSub.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.dgSub_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void dgPar_SelectedIndexChanged(object sender, System.EventArgs e)
{
string   id   =   dgPar.Items[dgPar.SelectedIndex].Cells[1].Text;   
GetSubDataBind(id);
} private void dgSub_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
//删除对应的列
string OrderID=this.dgSub.DataKeys[e.Item.ItemIndex].ToString();
SqlConnection con=DB.createCon();
SqlCommand cmd=new SqlCommand("delete from Orders where OrderID='"+OrderID+"'",con);
con.Open();
cmd.ExecuteNonQuery();
this.BindToDataGrid();
} private void dgSub_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem)
{
//鼠标悬停产生特殊效果，离开恢复
e.Item.Attributes.Add("onmouseover","c=this.style.backgroundColor;this.style.backgroundColor='#6699ff'");
e.Item.Attributes.Add("onmouseout","this.style.backgroundColor=c");
//取出第5个单元格（Cells[5]）的第一个控件（Controls[0]）
((LinkButton)(e.Item.Cells[5].Controls[0])).Attributes.Add("onclick","return confirm('确认删除！');");                
}
} private void dgSub_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.dgSub.EditItemIndex=-1;
this.BindToDataGrid();
} private void dgSub_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
this.dgSub.CurrentPageIndex=e.NewPageIndex;
this.BindToDataGrid();
} private void dgSub_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.dgSub.EditItemIndex=e.Item.ItemIndex;
this.BindToDataGrid();
} private void dgSub_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string OrderID=this.dgSub.DataKeys[e.Item.ItemIndex].ToString();
string CustomerID=((TextBox)e.Item.Cells[1].Controls[0]).Text;
string EmployeeID=((TextBox)e.Item.Cells[2].Controls[0]).Text;
string OrderDate =((TextBox)e.Item.Cells[3].Controls[0]).Text;
//错误原因是因为Northwind数据库不允许修改日期类型，如将日期类型改为{0:D},则执行出错！
SqlConnection con=DB.createCon();
SqlCommand cmd=new SqlCommand("update Orders set OrderID='"+OrderID+"', CustomerID='"+CustomerID+"',EmployeeID='"+EmployeeID+"',OrderDate='"+OrderDate+"' where OrderID='"+OrderID+"'",con);
con.Open();
cmd.ExecuteNonQuery();
this.dgSub.EditItemIndex=-1;
this.BindToDataGrid();
}
}
}

Answer 2

数据库为：
create database test
GO
use test
GO
create table Employees
(
EmployeeID int primary key,
LastName  Nvarchar(20) not null,
FirstName Nvarchar(10) not null,
Title Nvarchar(30),
TitleOfCourtesy Nvarchar(25),
BirthDate datetime,
HireDate datetime,
)
GO
insert into Employees values('1','Davolio','Nancy','Sales Representative','Ms.','1948-12-8','1992-5-1')
insert into Employees values('2','Fuller','Andrew','Vice President, Sale','Dr.','1952-2-19','1992-8-14')
insert into Employees values('3','Leverling','Janet','Sales Representative','Ms.','1963-8-30','1992-4-1')
insert into Employees values('4','Peacock','Margaret','Sales Representative','Mrs.','1937-9-19','1993-5-3')
GO
create table Orders
(
OrderID int primary key ,
CustomerID nchar(5) not null,
EmployeeID int not null,
OrderDate datetime  not null
)
GO
insert into Orders values('1024','VINET','1','1996-7-4')
insert into Orders values('1234','TOMSP','2','1996-7-4')
insert into Orders values('2316','HANAR','3','1996-7-4')
insert into Orders values('5673','OTTIK','4','1996-7-4')
insert into Orders values('3487','HILAA','2','1996-7-4')
insert into Orders values('2222','TOMSP','4','1996-7-4')
insert into Orders values('3333','HILAA','3','1996-7-4')
insert into Orders values('4444','HANAR','1','1996-7-4')
insert into Orders values('5555','TOMSP','1','1996-7-4')
insert into Orders values('6745','HANAR','4','1996-7-4')
ASPX页：<form id="Form1" method="post" runat="server">
<FONT face="宋体">父表：<BR>
</FONT>
<asp:DataGrid id="dgPar" runat="server" BorderColor="White" BorderWidth="2px" BackColor="White"
CellPadding="3" GridLines="None" AutoGenerateColumns="False" BorderStyle="Ridge" CellSpacing="1">
<FooterStyle Height="30px" ForeColor="Black" BackColor="#C6C3C6"></FooterStyle>
<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#9471DE"></SelectedItemStyle>
<ItemStyle Height="20px" ForeColor="Black" BackColor="#DEDFDE"></ItemStyle>
<HeaderStyle Font-Bold="True" Height="30px" ForeColor="#E7E7FF" BackColor="#4A3C8C"></HeaderStyle>
<Columns>
<asp:ButtonColumn Text="选择" CommandName="Select"></asp:ButtonColumn>
<asp:BoundColumn DataField="EmployeeID" HeaderText="EmployeeID"></asp:BoundColumn>
<asp:BoundColumn DataField="LastName" HeaderText="LastName"></asp:BoundColumn>
<asp:BoundColumn DataField="FirstName" HeaderText="FirstName"></asp:BoundColumn>
<asp:BoundColumn DataField="Title" HeaderText="Title"></asp:BoundColumn>
</Columns>
<PagerStyle HorizontalAlign="Right" ForeColor="Black" BackColor="#C6C3C6"></PagerStyle>
</asp:DataGrid>
<P><FONT face="宋体">子表：</FONT></P>
<asp:DataGrid id="dgSub" runat="server" BorderColor="White" BorderWidth="2px" BackColor="White"
CellPadding="3" GridLines="None" BorderStyle="Ridge" AutoGenerateColumns="False" CellSpacing="1">
<FooterStyle Height="30px" ForeColor="Black" BackColor="#C6C3C6"></FooterStyle>
<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#9471DE"></SelectedItemStyle>
<ItemStyle Height="20px" ForeColor="Black" BackColor="#DEDFDE"></ItemStyle>
<HeaderStyle Font-Bold="True" Height="30px" ForeColor="#E7E7FF" BackColor="#4A3C8C"></HeaderStyle>
<Columns>
<asp:BoundColumn DataField="OrderID" HeaderText="OrderID">
<HeaderStyle Width="100px"></HeaderStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="CustomerID" HeaderText="CustomerID">
<HeaderStyle Width="100px"></HeaderStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="EmployeeID" HeaderText="EmployeeID">
<HeaderStyle Width="100px"></HeaderStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="OrderDate" HeaderText="OrderDate">
<HeaderStyle Width="100px"></HeaderStyle>
</asp:BoundColumn>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="编辑"></asp:EditCommandColumn>
<asp:ButtonColumn Text="删除" CommandName="Delete"></asp:ButtonColumn>
</Columns>
<PagerStyle HorizontalAlign="Right" ForeColor="Black" BackColor="#C6C3C6"></PagerStyle>
</asp:DataGrid>
</form>

Answer 3

没有设置DataGrid中的关键字段

Answer 4

pagecount要从新计算，删了一条记录集的数据产生了变化，索引就会超出范围
页码会起变化，我当时是自己写的分页按钮，你可以下个分页的控件！