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
转载于:https://www.cnblogs.com/clyde-chen/p/3670636.html
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