前台代码书写：
前台代码
1 <asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server" BorderColor="Black"
2 onrowcancelingedit="GridView1_RowCancelingEdit"
3 onrowediting="GridView1_RowEditing"
4 onrowdatabound="GridView1_RowDataBound" onrowupdating="GridView1_RowUpdating">
5 <Columns>
6 <asp:TemplateField HeaderText ="ID">
7 <ItemTemplate>
8 <%#Eval("CustomerID") %>
9 </ItemTemplate>
10 <EditItemTemplate>
11 <%#Eval("CustomerID") %>
12 </EditItemTemplate>
13 </asp:TemplateField>
14 <asp:TemplateField HeaderText ="Name">
15 <ItemTemplate>
16 <%#Eval("CompanyName") %>
17 </ItemTemplate>
18 <EditItemTemplate>
19 <asp:TextBox ID="TextBox1" runat="server" Text ='<%#Eval("CompanyName") %>'></asp:TextBox>
20 </EditItemTemplate>
21 </asp:TemplateField>
22 <asp:TemplateField HeaderText ="Contact">
23 <ItemTemplate>
24 <%#Eval("ContactName") %>
25 </ItemTemplate>
26 <EditItemTemplate>
27 <asp:TextBox ID="TextBox2" runat="server" Text ='<%#Eval("ContactName") %>'></asp:TextBox>
28 </EditItemTemplate>
29 </asp:TemplateField>
30 <asp:TemplateField HeaderText ="Address">
31 <ItemTemplate>
32 <%#Eval("Address") %>
33 </ItemTemplate>
34 <EditItemTemplate>
35 <asp:TextBox ID="TextBox3" runat="server" Text ='<%#Eval("Address") %>'></asp:TextBox>
36 </EditItemTemplate>
37 </asp:TemplateField>
38 <asp:TemplateField HeaderText ="City">
39 <ItemTemplate>
40 <%#Eval("City") %>
41 </ItemTemplate>
42 <EditItemTemplate>
43 <asp:DropDownList ID="DropDownList1" AutoPostBack="true" runat="server">
44 </asp:DropDownList>
45 </EditItemTemplate>
46 </asp:TemplateField>
47 <asp:TemplateField HeaderText ="编辑">
48 <ItemTemplate>
49 <asp:Button ID="Button1" runat="server" Text="编辑" CommandName="Edit" />
50 </ItemTemplate>
51 <EditItemTemplate>
52 <asp:Button ID="Button2" runat="server" Text="修改" CommandName="Update" />
53 <asp:Button ID="Button3" runat="server" Text="取消" CommandName="Cancel" />
54 </EditItemTemplate>
55 </asp:TemplateField>
56 </Columns>
57 </asp:GridView>
后台代码：
后台代码
1 protected void Page_Load(object sender, EventArgs e)
2 {
3 if (!IsPostBack)
4 {
5 databind();
6 }
7 }
8 public void databind()
9 {
10 SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Conn"].ToString());
11 SqlCommand cmd = new SqlCommand("SELECT * FROM CUSTOMERS", con);
12 SqlDataAdapter da = new SqlDataAdapter(cmd);
13 DataSet ds = new DataSet();
14 da.Fill(ds);
15 this.GridView1.DataSource = ds.Tables[0];
16 this.GridView1.DataKeyNames = new string[] { "CustomerID", "City" };
17 this.GridView1.DataBind();
18 }
19 protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
20 {
21 this.GridView1.EditIndex = e.NewEditIndex;
22 databind();
23 }
24 protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
25 {
26 this.GridView1.EditIndex = -1;
27 databind();
28 }
29 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
30 {
31 foreach (TableCell item in e.Row.Cells)
32 {
33 item.Attributes.Add("style", "border-color:black");
34
35 }
36 if (e.Row.RowType == DataControlRowType.DataRow)
37 {
38 DropDownList dr = (DropDownList)e.Row.FindControl("DropDownList1");
39 if (dr != null)
40 {
41 SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Conn"].ToString());
42 SqlCommand cmd = new SqlCommand("Select distinct City from Customers", con);
43 SqlDataAdapter da = new SqlDataAdapter(cmd);
44 DataSet ds = new DataSet();
45 da.Fill(ds);
46 dr.DataSource = ds.Tables[0];
47 dr.DataTextField = "City";
48 dr.DataValueField = "City";
49 dr.DataBind();
50 dr.SelectedItem.Text = this.GridView1.DataKeys[e.Row.RowIndex].Values[1].ToString();
51 }
52 }
53 }
54 protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
55 {
56 SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Conn"].ToString());
57 SqlCommand cmd = new SqlCommand("Update Customers set CompanyName=@CompanyName,ContactName=@ContactName,City=@City where CustomerID=@CustomerID", con);
58 SqlParameter[] ps = new SqlParameter[4];
59 ps[0] = new SqlParameter("@CompanyName",SqlDbType.NVarChar,40);
60 ps[1] = new SqlParameter("@ContactName",SqlDbType.NVarChar,30);
61 ps[2] = new SqlParameter("@City",SqlDbType.NVarChar,15);
62 ps[3] = new SqlParameter("@CustomerID",SqlDbType.NChar,5);
63 ps[0].Value = ((TextBox)this.GridView1.Rows[e.RowIndex].FindControl("TextBox1")).Text.Trim();
64 ps[1].Value = ((TextBox)this.GridView1.Rows[e.RowIndex].FindControl("TextBox2")).Text.Trim();
65 ps[2].Value = ((DropDownList)this.GridView1.Rows[e.RowIndex].FindControl("DropDownList1")).SelectedItem.Text;
66 ps[3].Value = this.GridView1.DataKeys[e.RowIndex].Values[0];
67 cmd.Parameters.AddRange(ps);
68 if (con.State == ConnectionState.Closed)
69 {
70 con.Open();
71 }
72 cmd.ExecuteNonQuery();
73 this.GridView1.EditIndex = -1;
74 databind();
75 }