Question

我使用asp.net构建我的网站。我试图将数据绑定到我的gridview中找到的下拉列表。当我尝试将该数据连接到下拉列表时，我得到了无引用。可能是什么问题？

ASPX

<asp:GridView ID="TauluGridcompetitors" runat="server">
                <Columns>
                    <asp:TemplateField HeaderText="No Weapon">
                         <EditItemTemplate>
                            <asp:DropDownList ID="NoWeaponDDL" runat="server" AutoPostBack="true"></asp:DropDownList>
                        </EditItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Short Weapon"></asp:TemplateField>
                    <asp:TemplateField HeaderText="Long Weapon"></asp:TemplateField>
                    <asp:TemplateField HeaderText="Dual Weapon"></asp:TemplateField>
                    <asp:TemplateField HeaderText="Group Weapon"></asp:TemplateField>
                </Columns>
             </asp:GridView>

背后的代码

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            List<string> competitors = Request.Cookies["TauLucompetitors"].Value.ToString().Select(x => x.ToString()).ToList();
            TauluGridcompetitors.DataSource = competitors;
            TauluGridcompetitors.DataBind();
            GridView temp = (GridView)this.FindControl("TauluGridcompetitors");
            **DropDownList DDL1 = (DropDownList)TauluGridcompetitors.FindControl("NoWeaponDDL");**
            DDL1.DataSource = BindXml("XML/NoWeapon.xml");
            DDL1.DataTextField = "Type";
            DDL1.DataValueField = "ID";
            DDL1.DataBind();
        }
    }


    private DataSet BindXml(string fileName)
    {
        string filePath = "~/" + fileName;
        DataSet ds = new DataSet();
        ds.ReadXml(Server.MapPath(filePath));
        return ds;
    }

可能是什么问题？

Answer 1

您应该将数据绑定到 RowDataBound 事件中的下拉列表，并使用 ItemTemplate 而不是 EditItemTemplate 。

<强> ASPX

<asp:GridView ID="TauluGridcompetitors" OnRowDataBound="TauluGridcompetitors_RowDataBound" runat="server">
    <Columns>
        <asp:TemplateField HeaderText="No Weapon">
            <ItemTemplate>
                <asp:DropDownList ID="NoWeaponDDL" runat="server" AutoPostBack="true"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Short Weapon"></asp:TemplateField>
        <asp:TemplateField HeaderText="Long Weapon"></asp:TemplateField>
        <asp:TemplateField HeaderText="Dual Weapon"></asp:TemplateField>
        <asp:TemplateField HeaderText="Group Weapon"></asp:TemplateField>
    </Columns>
</asp:GridView>

代码背后

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        List<string> competitors = Request.Cookies["TauLucompetitors"].Value.ToString().Select(x => x.ToString()).ToList();
        TauluGridcompetitors.DataSource = competitors;
        TauluGridcompetitors.DataBind();
    }
}

protected void TauluGridcompetitors_RowDataBound(object sender, GridViewRowEventArgs e)
{     
    DropDownList DDL1;         
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DDL1 = (DropDownList)e.Row.FindControl("NoWeaponDDL");
        DDL1.DataSource = BindXml("XML/NoWeapon.xml").Tables[0];
        DDL1.DataTextField = "Type";
        DDL1.DataValueField = "ID";
        DDL1.DataBind();
    }
}

private DataSet BindXml(string fileName)
{
    string filePath = "~/" + fileName;
    DataSet ds = new DataSet();
    ds.ReadXml(Server.MapPath(filePath));
    return ds;
}

无法将数据绑定到gridview asp.net中的下拉列表

1 个答案: