Question

我希望将三个列字段显示为下拉列表，其他显示为文本框格式。我已编写代码以显示数据库中的下拉列表值，但它无法正常工作。我已附加了我的代码以供您参考

    <asp:GridView ID="Gv1" runat="server"  AutoGenerateColumns="False">
                    <Columns>
                        <asp:TemplateField HeaderText="FacultyName">
                            <ItemTemplate>
                                <asp:Label ID="lblfaculty" runat="server" Text='<%%# Eval("facultyname") %>>' Visible="false" />
                                <asp:DropDownList ID="ddlfaculty" runat="server" OnSelectedIndexChanged="ddlfaculty_SelectedIndexChanged"></asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Subject">
                            <ItemTemplate>
                                <asp:Label ID="lblsubject" runat="server" Text='<%%# Eval("subject") %>>' Visible="false" />
                                <asp:DropDownList ID="ddlsubject" runat="server" OnSelectedIndexChanged="ddlsubject_SelectedIndexChanged"></asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Subject">
                            <ItemTemplate>
                                <asp:Label ID="lblsubject" runat="server" Text='<%%# Eval("subject") %>>' Visible="false" />
                                <asp:DropDownList ID="ddlsubject" runat="server" OnSelectedIndexChanged="ddlsubject_SelectedIndexChanged1"></asp:DropDownList>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:Label ID="lblsubject" runat="server" Text='<%%# Eval("sethour") %>>' Visible="false" />
                                <asp:TextBox ID="ddlsethour" runat="server"></asp:TextBox>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:Label ID="lblcount" runat="server" Visible="false" />
                                <asp:TextBox ID="Count" runat="server"></asp:TextBox>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>

CodeBehind：

public partial class transhonorarium : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}

protected void ddlfaculty_SelectedIndexChanged(object sender, EventArgs e)
{
    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
    {
        SqlDataAdapter cmd = new SqlDataAdapter("select facultyname from faculty", con);
        DataTable dt = new DataTable("dt");
        cmd.Fill(dt);
        Gv1.DataSource = dt;
        Gv1.DataBind();
    }
}

protected void ddlsubject_SelectedIndexChanged(object sender, EventArgs e)
{
    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
    {
        SqlDataAdapter cmd = new SqlDataAdapter("select subject from assign where facultyname=@facultyname", con);
        DataTable dt = new DataTable("dt");
        cmd.Fill(dt);
        Gv1.DataSource = dt;
        Gv1.DataBind();
    }
}
}

Answer 1

当数据发生变化时，请调用Gridview的DataBind()方法。

我做这样的事情：

protected override void OnPreRender(Eventargs e)
{
  base.OnPreRender(e);
  GV1.DataBind();
}

Answer 2

你需要在这里改变一件事。

AutoGenerateColumns = true。因此，您将能够看到分配的列及其数据。

其次，

您需要Bind在Page_load或您想要的任何地方protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { Gv1.DataSource = Somesource; Gv1.DataBind(); } }。这是页面加载。

Bind Data

请参阅public void BindData() { SqlCommand comd = new SqlCommand("SELECT * FROM Yourtablename", con); SqlDataAdapter da = new SqlDataAdapter(comd); DataTable dt = new DataTable(); da.Fill(dt); GV1.DataSource = dt; GV1.DataBind(); }

{{1}}

希望有所帮助

Answer 3

为了填充您的下拉列表，您应该实现_RowDataBound事件并根据您的选择更新数据集基础，您还应该为您的下拉对象实现RowCommand事件。

顺便说一句。在ddlsubject_SelectedIndexChanged中，您还需要在sql命令中添加参数以使您的sql字符串正常工作，

希望这会有所帮助。

我运行代码时不显示Gridview

CodeBehind：

3 个答案: