asp.net Web 表单：从动态生成的列表中选择项目以在代码隐藏中使用

Question

 <div>Found <%=foodCount%> results</div>
        <div class="row">
            <%if (foodReports != null)
                { %>
            <%int count = 0; %>
            <% foreach (var f in foodReports)
                {

                    if (f.NRF63 > 28)
                        style = "green";
                    if (f.NRF63 <= 28 && f.NRF63 >= 4.66)
                        style = "#fabb36";
                    if (f.NRF63 < 4.66)
                        style = "#c32032";
            %>
            <div class="col-xs-12 mar-bottom-xs">
                <ul class="list-unstyled price-holder md-round bg-light pad-bottom-xs">
                    <li class="price-heading" style="background: <%=style%>;">
                        <div class="align-left pull-left">
                            <strong><%=f.desc.name%></strong>
                            <span class="txt"></span>
                        </div>
                        <div class="align-right pull-right">
                            <strong class="Price">Nutrition Index:  <%=f.NRF63%></strong>
                            <span class="txt">P/USDA</span>
                        </div>
                    </li>
                </ul>

            </div>
            <%count++; %>
            <% }
                } %>
        </div>

显然我是 Webforms 的新手。是否可以向 foodReports 显示的每个值添加链接按钮，并根据选择的按钮（通过索引或其他方式）执行不同的操作？

根据我看过的其他答案，我尝试使用 CommandArgument = "<% =count %>" 添加，但 CommandArgument 的字面意思是“<% =count %>”，而不是获取特定索引。任何允许我保留每个列出项目的样式的解决方案都可以。

Answer 1

"I have tried adding with CommandArgument = "<% =count %>" but the CommandArgument literally just comes out as "<% =count %>" instead of getting specific indexes."

第一
您不是 WebForms 的新手，您只知道 "other answers I've looked at".

所以买一些初学者的书，在 1 周内你会看到你的问题，并会因为让你的祖先难堪而牺牲你的生命来荣耀撒旦。

开玩笑...不是...也许...好吧，回答

回答

使用模型绑定技术

这里我会用Repeater和ObjectDataSource给大家演示一下。

数据访问对象 (DAO)

using MyWebApplication.Models;
namespace MyWebApplication.DAO
{
    public class FoodDAO
    {
        public List<Food> GetFoodList()
        {
            var foodList = new List<Food>();
            foodList.Add(new Food
            {
                Index = 1,
                NRF63 = 13.4m,
                Desc = new Desc { Name = "Potato" }
            });

            foodList.Add(new Food
            {
                Index = 2,
                NRF63 = 2.15m,
                Desc = new Desc { Name = "McDonalds" }
            });

            foodList.Add(new Food
            {
                Index = 3,
                NRF63 = 8000,
                Desc = new Desc { Name = "Bacon" }
            });

            return foodList;
        }
    }
}

型号

namespace MyWebApplication.Models
{
    public class Food
    {
        public decimal NRF63 { get; set; }
        public Desc Desc { get; set; }
        public int Index { get; set; }
        public string Style
        {
            get
            {
                if (NRF63 > 28)
                {
                    return "green";
                }
                else if (NRF63 <= 28 && NRF63 >= 4.66m)
                {
                    return "#fabb36";
                }
                else
                {
                    return "#c32032";
                }
            }
        }
    }

    public class Desc
    {
        public string Name { get; set; }
    }
}

设计器视图

<asp:Repeater ID="FoodRepeater" runat="server"
    DataSourceID="FoodDataSource"
    ItemType="MyWebApplication.Models.Food">

    <HeaderTemplate>
        <div class="row">
    </HeaderTemplate>

    <ItemTemplate>
        <div class="col-xs-12 mar-bottom-xs">
            <ul class="list-unstyled price-holder md-round bg-light pad-bottom-xs">
                <li class="price-heading" style='<%# "background:" + Item.Style + ";" %>'>
                    <div class="align-left pull-left">
                        <strong><%# Item.Desc.Name %></strong>
                        <span class="txt"></span>
                    </div>
                    <div class="align-right pull-right">
                        <strong class="Price">Nutrition Index:  <%# Item.NRF63.ToString("{0:0.00}") %></strong>
                        <span class="txt">P/USDA</span>
                    </div>
                </li>
                <li>
                    <asp:LinkButton ID="SomeLinkButton" runat="server"
                        CommandArgument='<%# Item.Index %>'
                        OnClick="SomeLinkButton_Click">
                        <%# Item.Index %>
                    </asp:LinkButton>
                </li>
            </ul>
        </div>
    </ItemTemplate>

    <FooterTemplate>
        </div>
    </FooterTemplate>

</asp:Repeater>
<div class="row">
    <asp:Label ID="lblFoodsCount" runat="server"></asp:Label>
</div>
<asp:ObjectDataSource ID="FoodDataSource" runat="server"
    TypeName="MyWebApplication.DAO.FoodDAO"
    DataObjectTypeName="MyWebApplication.Models.Food"
    EnablePaging="false"
    SelectMethod="GetFoodList"
    OnSelected="FoodDataSource_Selected">
</asp:ObjectDataSource>

代码隐藏

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

    protected void SomeLinkButton_Click(object sender, EventArgs e)
    {
        var button = sender as LinkButton;

        int index;
        if (!int.TryParse(button.CommandArgument, out index))
            return;

        //  Do something with 'index'
    }

    protected void FoodDataSource_Selected(object sender, ObjectDataSourceStatusEventArgs e)
    {
        lblFoodsCount.Text = "The server return " +
            ((IList<Food>)e.ReturnValue).Count + " foods";
    }
}

asp.net Web 表单：从动态生成的列表中选择项目以在代码隐藏中使用

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