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.NET中使用GridView控件输入数据时出现“ Index …

2018-06-17 19:40:15来源：未知阅读 ()

在.NET中使用GridView控件的在线编辑数据时，出现了“ Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"的关于数据索引值错误的问题，在网上查了许多，感觉都没有什么文章是直接指出解决问题的方法，先就总结下吧

其实，这个问题在操作时是需要非常注意的，它并不在GridView控件的RowEditing或者RowUpdating方法中，而是需要在获取数据的类中指定GridView控件的主键，后台代码如部分如下：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Web;
  5 using System.Web.UI;
  6 using System.Web.UI.WebControls;
  7 using System.Data;
  8 using System.Data.SqlClient;
  9 using System.Configuration;
 10 
 11 namespace UI
 12 {
 13     public partial class _Default : System.Web.UI.Page
 14     {
 15         protected void Page_Load(object sender, EventArgs e)
 16         {
 17             //判断是否第一次加载Bind()类
 18             if (!IsPostBack)
 19             {
 20                 Bind();
 21             }
 22         }
 23 
 24         /// <summary>创建返回数据库连接的公共类
 25         /// </summary>
 26         /// <returns>返回连接数据库的类</returns>
 27         public SqlConnection GetConnection()
 28         {
 29                 string str_conn = ConfigurationManager.AppSettings["myConStr"].ToString();
 30                 SqlConnection myConn = new SqlConnection(str_conn);
 31                 return myConn;
 32         }
 33 
 34         /// <summary>将查询的数据绑定到GridView控件中
 35         /// </summary>
 36         public void Bind()
 37         {     
 38             try
 39             {
 40                 SqlConnection myConn = GetConnection();
 41                 myConn.Open();
 42 
 43                 string sql_Str = "select * from stuInfo order by stuAge desc";
 44 
 45                 SqlDataAdapter myda = new SqlDataAdapter(sql_Str, myConn);
 46                 DataSet myDs = new DataSet();
 47                 myda.Fill(myDs);
 48 
 49                 GridView1.DataSource = myDs;
 50 
 51                 //为GridView控件设置主键，此处必须有否则会产生如下代码中的溢出错误
 52                 /*
 53                  * Index was out of range. Must be non-negative and less than the size of the collection.
 54                   Parameter name: index 
 55                  */
 56                 GridView1.DataKeyNames = new string[] { "stuNo" };//GridView控件设置主键，此处最为关键，稍不留意就忘掉了，切记呀
 57                 GridView1.DataBind();
 58 
 59                 myDs.Dispose();
 60                 myda.Dispose();
 61                 myConn.Close();
 62             }
 63             catch (Exception ex)
 64             {
 65                 Response.Write(ex.Message);
 66             }
 67         }
 68 
 69         /// <summary>创建GridView控件的RowEditing事件类
 70         /// </summary>
 71         /// <param name="sender"></param>
 72         /// <param name="e"></param>
 73         protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
 74         {
 75             GridView1.EditIndex = e.NewEditIndex;
 76             this.Bind();
 77         }
 78 
 79         /// <summary>创建GridView控件的RowUpdating事件类
 80         /// </summary>
 81         /// <param name="sender"></param>
 82         /// <param name="e"></param>
 83         protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
 84         {
 85             try
 86             {
 87                 //获取在GridView控件里相关事件的键值
 88                 int stuNum = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());
 89                 string newName = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString();
 90 
 91                 SqlConnection myConn = GetConnection();
 92                 myConn.Open();
 93 
 94                 /*
 95                  * string sql_str = "update stuInfo set stuName='" + newName + "' where stuNo='" + stuNum + "'";
 96                  *与上句相比，以下使用带参数的SQL语句在一定程度上可防止SQL注入攻击
 97                 */
 98                 string sql_str = "update stuInfo set stuName=@newName where stuNo=@stuNum";
 99                 SqlCommand myCmd = new SqlCommand(sql_str, myConn);
100                 myCmd.Parameters.Add("@newName", SqlDbType.NVarChar).Value = newName;
101                 myCmd.Parameters.Add("@stuNum", SqlDbType.VarChar).Value = stuNum;
102 
103                 if (myCmd.ExecuteNonQuery() > 0)
104                 {
105                     Response.Write("<script type='text/javascript'>alert('更新成功');</script>");
106                 }
107                 else
108                 {
109                     Response.Write("<script type='text/javascript'>alert('更新失败');</script>");
110                 }
111 
112                 //调试用
113                 textbox1.Text = "学号：" + stuNum + " , 姓名：" + newName + ", " + sql_str + ", ExecuteNonQuery状态：" + myCmd.ExecuteNonQuery();
114 
115                 myCmd.Dispose();
116                 myConn.Close();
117                 GridView1.EditIndex = -1;
118                 this.Bind();
119             }
120             catch (Exception ex)
121             {
122                 Response.Write(ex.Message);
123             }
124         }
125 
126         /// <summary>创建GridView控件的RowCancelingEdit事件类
127         /// </summary>
128         /// <param name="sender"></param>
129         /// <param name="e"></param>
130         protected void GridView1_RowsCancelingEdit(object sender, GridViewCancelEditEventArgs e)
131         {
132             GridView1.EditIndex = -1;
133             this.Bind();
134         }
135　　　}
136　}