GridView 的编辑、更新方法

布局页

aspx 页面中 GridView 布局（共四列数据和一列操作链接，只有后两列数据可以编辑）：
            <Columns>
                <asp:BoundField HeaderText="商品编号" DataField="PID" ReadOnly="true" SortExpression="PID" />
                <asp:BoundField HeaderText="供应商编号" DataField="GID" ReadOnly="true" SortExpression="GID" />
                <asp:TemplateField HeaderText="商品名称" SortExpression="PName">
                    <ItemTemplate>
                        <%#Eval("PName")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox Width="80px" Font-Size="8pt" Font-Names="Tahoma" ID="PName" Text='<%#Eval("PName")%>' runat="server" />
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="价格" SortExpression="Price">
                    <ItemTemplate>
                        <%#Eval("Price")%>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="Price" runat="server" Font-Names="Tahoma" Font-Size="8pt" Text='<%#Eval("Price")%>' Width="50px" />
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:CommandField ShowEditButton="true" HeaderText="操作" ShowDeleteButton="True"
                    ShowSelectButton="True" />
            </Columns>

后置代码页

  1 using System;
  2 using System.Configuration;
  3 using System.Data;
  4 using System.Web;
  5 using System.Web.Security;
  6 using System.Web.UI;
  7 using System.Web.UI.HtmlControls;
  8 using System.Web.UI.WebControls;
  9 using System.Web.UI.WebControls.WebParts;
 10 using System.Data.SqlClient;
 11 
 12 public partial class _Default : System.Web.UI.Page
 13 {
 14     #region GridView 分页及编辑功能！
 15     protected void Page_Load(object sender, EventArgs e)
 16     {
 17         Page.Title = "C# GridView 编辑、更新、删除、排序测试程序！";
 18 
 19         //Label lb = new Label();
 20         //lb.Text = "测试一下动态添加控件到页面中！";
 21         //this.Controls.Add(lb);
 22 
 23         Label l = new Label();
 24         l = Label1;
 25         l.Font.Size = 8;
 26         l.Font.Name = "微软雅黑";
 27         l.ForeColor = System.Drawing.Color.Red;
 28     }
 29 
 30     protected void LinkButton1_Click(object sender, EventArgs e)
 31     {
 32         gvBind();
 33     }
 34 
 35     protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
 36     {
 37         GridView1.PageIndex = e.NewPageIndex;
 38         gvBind();
 39     }
 40 
 41     #endregion
 42 
 43     #region 绑定数据到 GridView
 44     private void gvBind()
 45     {
 46         string cns = "Server=.;database=MyDB;uid=sa;pwd=123456";
 47         string cmd = "Select * From Product";
 48 
 49         SqlDataAdapter da = new SqlDataAdapter(cmd, cns);
 50         DataSet ds = new DataSet("Product");
 51 
 52 
 53         try
 54         {
 55             da.Fill(ds, "Product");
 56             DataView dv = ds.Tables[0].DefaultView;
 57 
 58             this.GridView1.DataSource = dv;
 59             this.GridView1.AllowPaging = true;
 60             GridView1.PageSize = 15;
 61             this.GridView1.DataBind();
 62         }
 63         catch (Exception ex)
 64         {
 65             Label1.Text = ex.Message;
 66         }
 67     }
 68 
 69     private void gvBind(string sortExpression, string sortDirection)
 70     {
 71         //重载一次，增加排序功能
 72         string cns = "Server=.;database=MyDB;uid=sa;pwd=123456";
 73         string cmd = "Select * From Product";
 74 
 75         SqlDataAdapter da = new SqlDataAdapter(cmd, cns);
 76         DataSet ds = new DataSet("Product");
 77 
 78         try
 79         {
 80             da.Fill(ds, "Product");
 81             DataView dv = ds.Tables[0].DefaultView;
 82 
 83             //排序关键字
 84             dv.Sort = sortExpression + " " + sortDirection;
 85 
 86             this.GridView1.DataSource = dv;
 87             this.GridView1.AllowPaging = true;
 88             GridView1.PageSize = 15;
 89             this.GridView1.DataBind();
 90         }
 91         catch (Exception ex)
 92         {
 93             Label1.Text = ex.Message;
 94         }
 95     }
 96     #endregion
 97 
 98     #region 编辑，放弃编辑，刷新页面
 99     protected void LinkButton2_Click(object sender, EventArgs e)
     {
         Response.Redirect(Request.RawUrl);
     }
     protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
     {
         GridView1.EditIndex = e.NewEditIndex;
         gvBind();
     }
     protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
     {
         GridView1.EditIndex = -1;
         gvBind();
     }
     #endregion
 
     #region 更新 GridView 中的数据行！
     protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
     {
         //非常变态的一个地方，GridView 必须指定 DataKeyNames，也就是字段名称
         string pid = this.GridView1.DataKeys[e.RowIndex].Values[0].ToString();
         string pn = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("PName")).Text;
         string pr = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("Price")).Text;
 
         //更新数据库
         string sql = "Update Product Set PName='" + pn + "',Price=" + pr + " Where PID=" + Convert.ToString(pid);
         SqlConnection CN = new SqlConnection("server=.;database=mydb;uid=sa;pwd=123456;");
         SqlCommand CMD = new SqlCommand(sql, CN);
 
         if (CN.State.ToString() == "Closed") CN.Open();
         CMD.ExecuteNonQuery();
         CMD.Dispose();
         if (CN.State.ToString() == "Open") CN.Close();
 
         Label1.Text = "更新成功！";
 
         GridView1.EditIndex = -1;   //设为 -1 可取消编辑状态
         gvBind();
     }
     #endregion
 
     #region 删除 GridView 中的数据行！
     protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
     {
         string pid = GridView1.DataKeys[e.RowIndex].Values[0].ToString();
 
         //删除数据库中的记录
         string sql = "Delete From Product Where PID = " + pid;
         SqlConnection CN = new SqlConnection("server=.;database=mydb;uid=sa;pwd=123456;");
         SqlCommand CMD = new SqlCommand(sql, CN);
 
         if (CN.State.ToString() == "Closed") CN.Open();
         CMD.ExecuteNonQuery();
         CMD.Dispose();
         if (CN.State.ToString() == "Open") CN.Close();
 
         Label1.Text = "删除成功！";
 
         gvBind();
     }
     #endregion
 
     #region 选择 GridView 中的数据行！
     protected void GridView1_SelectChanging(object sender, GridViewSelectEventArgs e)
     {
         GridView1.SelectedIndex = e.NewSelectedIndex;
         gvBind();
 
         Label1.Text = Convert.ToString(e.NewSelectedIndex);
     }
     #endregion
 
     #region GridView 排序
     protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
     {
         //排序问题！
         ViewState["sortExpression"] = e.SortExpression;
 
         if ((string)ViewState["sortDirection"] == "ASC" || ViewState["sortDirection"] == null)
         {
             ViewState["sortDirection"] = "DESC";
             gvBind(e.SortExpression, "DESC");
         }
         else
         {
             ViewState["sortDirection"] = "ASC";
             gvBind(e.SortExpression, "ASC");
         }
     #endregion
     }
 }