Question

我想选择OrderId＆amp;从多个词典中排，并创建一个包含行列表的订单列表。

我正在努力解决这个问题的代码是：

var listOfDictionaries = new List<Dictionary<string, string>>();

var dict1 = new Dictionary<string, string>();
dict1.Add("OrderId", "12345");      
dict1.Add("Row", "1");              
listOfDictionaries.Add(dict1);

var dict2 = new Dictionary<string, string>();
dict2.Add("OrderId", "97845");
dict2.Add("Row", "10");
listOfDictionaries.Add(dict2);

var dict3 = new Dictionary<string, string>();
dict3.Add("OrderId", "12345");
dict3.Add("Row", "2");
listOfDictionaries.Add(dict3);

var grouped = listOfDictionaries.SelectMany(d => 
                 d.Where(kvp => 
                    kvp.Key.ToLower().Contains("orderid") || kvp.Key.ToLower().Contains("row")))
              .GroupBy(a => a.Key).ToList();

public class Order 
{
    public Order() 
    {
       OrderRows = new List<OrderRow>();
    }

    public string OrderId { get; set; }
    public List<OrderRow> OrderRows { get; set; }
}

public class OrderRow 
{
    public string OrderRowId { get; set; }
}

任何人都知道如何解决这个问题？

Answer 1

您可以先选择订单，然后选择这样的内容行。

var orderFieldName = "OrderId";
var orders = listOfDictionaries.Select(dict => dict[orderFieldName]).Distinct();
var grouped = orders.Select(order => new Order
{
    OrderId = order,
    OrderRows = listOfDictionaries.Where(dict => dict[orderFieldName] == order)
        .Select(item => new OrderRow {OrderRowId = item["Row"]}).ToList()
});

Answer 2

你需要做

var result = listOfDictionaries.Select(x => new { OrderId = x["OrderId"], Row = x["Row"] })
                   .GroupBy(x => x.OrderId)
                   .Select(x => new { OrderId = x.Key, Values = x.Select(y => y.Row) });

Answer 3

我觉得你的词典代码不会运行，因为它不允许你在同一个列表中输入重复的键值。所以我在这里使用Struct

列表创建了一个解决方案

class Stackoverflow
{
    struct OrderData
    {
        public string OrderID { get; set; }
        public string Row { get; set; }
    }
    static void Main(string[] args)
    {
        string strInputOrderID = "ORD1";

        ////Using Struct List
        List<OrderData> objOrderDataList = new List<OrderData>();

        OrderData objOrderData = new OrderData();
        objOrderData.OrderID = "ORD1";
        objOrderData.Row = "1";
        objOrderDataList.Add(objOrderData);

        objOrderData = new OrderData();
        objOrderData.OrderID = "ORD2";
        objOrderData.Row = "2";
        objOrderDataList.Add(objOrderData);

        objOrderData = new OrderData();
        objOrderData.OrderID = "ORD3";
        objOrderData.Row = "3";
        objOrderDataList.Add(objOrderData);

        objOrderData = new OrderData();
        objOrderData.OrderID = "ORD1";
        objOrderData.Row = "4";
        objOrderDataList.Add(objOrderData);

        List<OrderData> resultOrderDataList = (from data in objOrderDataList
                                               where data.OrderID.Equals(strInputOrderID)
                                               select data).ToList();
        Console.ReadLine();
    }
}

我已经运行它并且工作正常。请检查并在评论中告诉我。

Answer 4

就像@Nikhil Agrawal所说：

检查this

var result = listOfDictionaries
            .Select(x => new { OrderId = x["OrderId"], Row = x["Row"] })
            .GroupBy(x => x.OrderId)
            .Select(x => new Order{
                OrderId = x.Key, 
                OrderRows = x.Select(y => new OrderRow{OrderRowId = y.Row}).ToList()
            });

使用LINQ从多个词典中选择值到对象列表中

4 个答案: