如何在 C# 中访问 class 的列表 <> 属性？

Question

我基本上是在用餐厅信息填充中继器。

class Restaurant
{
    public int Id { get; set; };
    public string Name { get; set; };
    public List<Category> RestaurantCategory { get; set; };
    public string Address { get; set; };
}

class Category
{
    public int CategoryId { get; set; };
    public int RestaurantId { get; set; };
    public string CategoryName { get; set; };
}

我的中继器的名字是rptRestaurantInfo:

rptRestaurantInfo.DataSource = RestaurantData; //RestaurantData is of type List<Restaurant>
rptRestaurantInfo.DataBind();

我想要做的是，<table> 我想在其中显示我的转发器数据，我想显示与每个餐厅相关联的类别名称。

如何访问 List<Category> 的值？

我尝试过的：

遍历每个 Restaurant 项。将项目的值存储在 Category:

类型的列表中

    foreach(var restaurant in RestaurantData)
    {
        restaurant.instanceOfCategory. // properties of Category do not appear
    }

Answer 1

我喜欢使用易于绑定的数据表。尝试以下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Restaurant> RestaurantData = new List<Restaurant>();

            DataTable rptRestaurantInfo = new DataTable();
            rptRestaurantInfo.Columns.Add("Id", typeof(int));
            rptRestaurantInfo.Columns.Add("Name", typeof(string));
            rptRestaurantInfo.Columns.Add("Address", typeof(string));
            rptRestaurantInfo.Columns.Add("CategoryId", typeof(int));
            rptRestaurantInfo.Columns.Add("RestaurantId", typeof(int));
            rptRestaurantInfo.Columns.Add("CategoryName", typeof(string));

            foreach(Restaurant restaurant in RestaurantData)
            {
                foreach(Category category in restaurant.RestaurantCategory)
                {
                    rptRestaurantInfo.Rows.Add(new object[] {
                        restaurant.Id,
                        restaurant.Name,
                        restaurant.Address,
                        category.CategoryId,
                        category.RestaurantId,
                        category.CategoryName
                    });

                }
            }
        }
    }
    public class Restaurant
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<Category> RestaurantCategory { get; set; }
        public string Address { get; set; }
    }

    public class Category
    {
        public int CategoryId { get; set; }
        public int RestaurantId { get; set; }
        public string CategoryName { get; set; }
    }
}

如何在 C# 中访问 class 的列表 <> 属性？

How to access a List<> property of a class in C#?

c#

asp.net

collections

webforms

list