Question

我有一个像

这样的对象

public class Sales
{   
 public string Year { get; set; }  
 public string Item {get; set;}
 public Dictionary<string,double> Sales { get; set; }  
}

然后将其存储到Dictionary<string,double>。

因此，假设我创建了两个Sales个对象，例如：

obj 1 = {
    Year = "2015",
    Item = "Banana",
    Sales = {
        {"Week1", 2}
        {"Week2", 24}
        {"Week3", 69}
    }
}

obj 2 = {  
    Year = "2015",
    Item = "APPLE",
    Sales = {
        {"Week1", 3} 
        {"Week2", 4}
        {"Week3", 8}
    } 
}

如何编写将结果返回到datagrid的linq查询，以便它具有以下行输出

第1行：年份，类别，第1周，第2周，第3周

第2行：2015年，Banana，2,24,69

第3行：2015年，Apple，3,4,8

Answer 1

我会将所有内容放入DataTable中，然后将数据表作为控件的数据源。

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

namespace ConsoleApplication45
{
    class Program
    {
        static void Main(string[] args)
        {
           List<Sales> sales = new List<Sales>() {
               new Sales() {
                   year = 2015, item = "Banana", sales = new Dictionary<string,double>() {
                     {"Week1", 2}, {"Week2", 24},{"Week3", 69}
                   }
               },
                new Sales() {
                   year = 2015, item = "Apple", sales = new Dictionary<string,double>() {
                     {"Week1", 3}, {"Week2", 4},{"Week3", 8}
                   }
               }

           };
           DataTable dt = new DataTable();
            dt.Columns.Add("Year", typeof(int));
            dt.Columns.Add("Category", typeof(string));
            dt.Columns.Add("Week1", typeof(double));
            dt.Columns.Add("Week2", typeof(double));
            dt.Columns.Add("Week3", typeof(double));

            foreach(Sales sale in sales)
            {
                dt.Rows.Add(new object[] {
                    sale.year,
                    sale.item,
                    sale.sales["Week1"],
                    sale.sales["Week2"],
                    sale.sales["Week3"]
                });
             }


        }
    }
    public class Sales
    {
        public int year { get; set; }
        public string item { get; set; }
        public Dictionary<string, double> sales { get; set; }
    } 
}

Linq在对象中拼合字典

1 个答案: