Question

当我通过GridView的空模板插入任何数据时。值被插入到DB中但Gridview在插入后没有与这些值绑定（以编程方式完成），因此变为空，即不显示插入的值。

这里我只插入一个值（在dbms表的ques字段中）以保持代码简短。

GridView HTML标记代码

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" ShowFooter="True" Height="146px" style="margin-top: 5px" Width="866px" >
                <Columns>
                    <asp:TemplateField HeaderText="qno">
                        <FooterTemplate>
                            <asp:TextBox ID="qno" runat="server"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Ques">
                        <FooterTemplate>
                            <asp:TextBox ID="ques" runat="server" Height="16px" Width="78px"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="op1">
                        <FooterTemplate>
                            <asp:TextBox ID="op1" runat="server" Height="16px" Width="76px"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="op2">
                        <FooterTemplate>
                            <asp:TextBox ID="Top2" runat="server" Height="16px" Width="74px"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="op3">
                        <FooterTemplate>
                            <asp:TextBox ID="op3" runat="server" Height="16px" Width="74px"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="op4">
                        <FooterTemplate>
                            <asp:TextBox ID="op4" runat="server"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="ans">
                        <FooterTemplate>
                            <asp:TextBox ID="ans" runat="server"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="marks">
                        <FooterTemplate>
                            <asp:TextBox ID="marks" runat="server"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="UploadImage">
                        <FooterTemplate>
                            <asp:TextBox ID="imageP" runat="server"></asp:TextBox>
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField>
                        <FooterTemplate>
                            <asp:Button ID="Button2" runat="server" Text="save" Width="78px" OnClick="Button2_Click1" />
                        </FooterTemplate>
                    </asp:TemplateField>
                </Columns>


                 <EmptyDataTemplate>
    <tr style="background-color: Green;">
        <th scope="col">
            qno
        </th>
        <th scope="col">
            ques
        </th>
        <th scope="col">
            op1
        </th>
        <th scope="col">
            op2
        </th>
        <th scope="col">
            op3
        </th>
        <th scope="col">
            op4
        </th>
        <th scope="col">
            ans
        </th>
        <th scope="col">
            marks
        </th>
        <th scope="col">
            imageP
        </th>
        <th scope="col">

        </th>
    </tr>
    <tr>
        <td>
            <asp:TextBox ID="qno" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="ques" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="op1" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="op2" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="op3" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="op4" runat="server" Height="16px" Width="68px" />
        </td>
        <td>
            <asp:TextBox ID="ans" runat="server"  Height="16px" Width="68px"/>
        </td>
        <td>
            <asp:TextBox ID="marks" runat="server"  Height="16px" Width="68px"/>
        </td>
        <td>
            <asp:TextBox ID="imageP" runat="server"  Height="16px" Width="68px"/>
        </td>

        <td>
            <asp:Button ID="Button2" runat="server" Text="Add" OnClick="Button2_Click1" CommandName = "EmptyDataTemplate" />
        </td>
    </tr>
</EmptyDataTemplate>

            </asp:GridView>

C＃代码：

public partial class qpaper : System.Web.UI.Page
{
String conStr = "Data Source=temporary; Initial Catalog=temporary1;Integrated Security=True";
String qpname = null;


protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        this.BindData();
    }
}





private void BindData()
{

    DataTable dt = new DataTable();
    using (SqlConnection con = new SqlConnection(conStr))
    {
        string strQuery = "SELECT * FROM dbms";
        SqlCommand cmd = new SqlCommand(strQuery);
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            con.Open();
            sda.SelectCommand = cmd;
            sda.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }
}




protected void Button2_Click1(object sender, EventArgs e) // save button in gridview/empty template
{

    Control control = null;
    if (GridView1.FooterRow != null)
    {
        control = GridView1.FooterRow;
    }
    else
    {
        control = GridView1.Controls[0].Controls[0];
    }
    string ques = (control.FindControl("ques") as TextBox).Text;

    using (SqlConnection con = new SqlConnection(conStr))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "insert into dbms (ques) VALUES (@ques)"; //inserting only one value here for shortening code length
            cmd.Parameters.AddWithValue("@ques", ques);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
    Response.Redirect(Request.Url.AbsoluteUri);

}

}

表格结构：

qno int , ques nvarchar(500), op1 nvarchar(50), op2 nvarchar(50), op3 nvarchar(50), op4 nvarchar(50), ans nvarchar(50), marks int, imagePath nvarchar(200)

Answer 1

您需要至少有一个 BoundField 列才能使自动绑定生效。

例如：这不起作用

<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server">
    <Columns>
        <asp:TemplateField HeaderText="Name">
            <ItemTemplate>
                <asp:TextBox Id="txtName" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Address">
            <ItemTemplate>
                <asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

这将有效

<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server">
    <Columns>
        <asp:BoundField HeaderText="ID" DataField="id" />
        <asp:TemplateField HeaderText="Name">
            <ItemTemplate>
                <asp:TextBox Id="txtName" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Address">
            <ItemTemplate>
                <asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Gridview在空模板后不与数据表绑定

1 个答案: