.NET中使用GridView控件輸入數據時出現“ Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"的問題

在.NET中使用GridView控件的在線編輯數據時，出現了“ Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"的關於數據索引值錯誤的問題，在網上查了許多，感覺都沒有什么文章是直接指出解決問題的方法，先就總結下吧

其實，這個問題在操作時是需要非常注意的，它並不在GridView控件的RowEditing或者RowUpdating方法中，而是需要在獲取數據的類中指定GridView控件的主鍵，后台代碼如部分如下：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace UI
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //判斷是否第一次加載Bind()類
            if (!IsPostBack)
            {
                Bind();
            }
        }

        /// <summary>創建返回數據庫連接的公共類
        /// </summary>
        /// <returns>返回連接數據庫的類</returns>
        public SqlConnection GetConnection()
        {
                string str_conn = ConfigurationManager.AppSettings["myConStr"].ToString();
                SqlConnection myConn = new SqlConnection(str_conn);
                return myConn;
        }

        /// <summary>將查詢的數據綁定到GridView控件中
        /// </summary>
        public void Bind()
        {     
            try
            {
                SqlConnection myConn = GetConnection();
                myConn.Open();

                string sql_Str = "select * from stuInfo order by stuAge desc";

                SqlDataAdapter myda = new SqlDataAdapter(sql_Str, myConn);
                DataSet myDs = new DataSet();
                myda.Fill(myDs);

                GridView1.DataSource = myDs;

                //為GridView控件設置主鍵，此處必須有否則會產生如下代碼中的溢出錯誤
                /*
                 * Index was out of range. Must be non-negative and less than the size of the collection.
                  Parameter name: index 
                 */
                GridView1.DataKeyNames = new string[] { "stuNo" };//GridView控件設置主鍵，此處最為關鍵，稍不留意就忘掉了，切記呀
                GridView1.DataBind();

                myDs.Dispose();
                myda.Dispose();
                myConn.Close();
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }

        /// <summary>創建GridView控件的RowEditing事件類
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            GridView1.EditIndex = e.NewEditIndex;
            this.Bind();
        }

        /// <summary>創建GridView控件的RowUpdating事件類
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            try
            {
                //獲取在GridView控件里相關事件的鍵值
                int stuNum = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());
                string newName = ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString();

                SqlConnection myConn = GetConnection();
                myConn.Open();

                /*
                 * string sql_str = "update stuInfo set stuName='" + newName + "' where stuNo='" + stuNum + "'";
                 *與上句相比，以下使用帶參數的SQL語句在一定程度上可防止SQL注入攻擊
                */
                string sql_str = "update stuInfo set stuName=@newName where stuNo=@stuNum";
                SqlCommand myCmd = new SqlCommand(sql_str, myConn);
                myCmd.Parameters.Add("@newName", SqlDbType.NVarChar).Value = newName;
                myCmd.Parameters.Add("@stuNum", SqlDbType.VarChar).Value = stuNum;

                if (myCmd.ExecuteNonQuery() > 0)
                {
                    Response.Write("<script type='text/javascript'>alert('更新成功');</script>");
                }
                else
                {
                    Response.Write("<script type='text/javascript'>alert('更新失敗');</script>");
                }

                //調試用
                textbox1.Text = "學號：" + stuNum + " , 姓名：" + newName + ", " + sql_str + ", ExecuteNonQuery狀態：" + myCmd.ExecuteNonQuery();

                myCmd.Dispose();
                myConn.Close();
                GridView1.EditIndex = -1;
                this.Bind();
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }

        /// <summary>創建GridView控件的RowCancelingEdit事件類
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GridView1_RowsCancelingEdit(object sender, GridViewCancelEditEventArgs e)
        {
            GridView1.EditIndex = -1;
            this.Bind();
        }
135　　　}
136　}

 

至於前台頁面，無非就是綁定相關的事件了，在這就不貼代碼了