.NET中使用GridView控件输入数据时出现“ Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"的问题

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　}

 

至于前台页面，无非就是绑定相关的事件了，在这就不贴代码了