使用原始数据或对象进行排序，自定义和生成

Question

我有一份客户记录清单，可能有数千，

我想生成层次结构中的报告（Crystal或MS）。

它应该是这样的

客户按国家/地区，然后是城市中的客户，然后是区域中的客户，然后是这些区域中的男性和女性。

我也希望向客户展示plusminus从顶部计算。

像纽约市的4位顾客一样，所有人都有+500，所以我在2000年的价值;

任何想法，提示算法我怎么能实现这个？

这是客户对象和示例客户。

public class Customer
{
    public int CutIND { get; set; }
    public string CustName { get; set; }
    public string Country { get; set; }
    public string City { get; set; }
    public string Area { get; set; }
    public string Gender { get; set; }
    public int plusMinus { get; set; }
}

和示例客户

        Customer c1 = new Customer();
        c1.CutIND = 123445;
        c1.CustName = "Sajjad";
        c1.Country = "US";
        c1.City = "NYC";
        c1.Area = "BLueArea";
        c1.plusMinus = -560;


        Customer c2 = new Customer();
        c2.CutIND = 43432;
        c2.CustName = "Mike";
        c2.Country = "UK";
        c2.City = "London";
        c2.Area = "SomeArea";
        c2.plusMinus = 9000;

Answer 1

您可以使用LINQ查询相对轻松地在多个级别分层分组数据。

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

namespace ConsoleApplication1
{
  public class Customer
  {

     public int CutIND { get; set; }
     public string CustName { get; set; }
     public string Country { get; set; }
     public string City { get; set; }
     public string Area { get; set; }
     public string Gender { get; set; }
     public int plusMinus { get; set; }
     public Customer(int CutIND, string CustName, string Country, string City, string Area, string Gender, int plusMinus)
     {
        this.CutIND = CutIND;
        this.CustName = CustName;
        this.Country = Country;
        this.City = City;
        this.Area = Area;
        this.Gender = Gender;
        this.plusMinus = plusMinus;
     }
  }


  class Program
  {
     static void Main(string[] args)
     {
        Customer[] customers = new Customer[] {
           new Customer(123445, "Sajjad", "US", "NYC", "BLueArea", "M", -560),
           new Customer(43432, "Mike", "UK", "London", "someArea", "M", 9000),
           new Customer(20001, "Mathilde", "OS", "Vienna", "WienerWald", "F", 8192),
           new Customer(20002, "Harry", "US", "NYC", "Broooklyn", "M", 50),
           new Customer(20003, "Jim", "OS", "Vienna", "AIS", "M", 12000),
           new Customer(20004, "Bill", "US", "MSP", "Excelsior", "M", 90)
        };

        var CityGroups =
           from c in customers
           group c by new { Country = c.Country, City = c.City } into cities
           select new { Country = cities.Key.Country, City = cities.Key.City, Total = cities.Sum(c => c.plusMinus), Residents = cities };

        var CountryGroups =
           from city in CityGroups
           group city by city.Country into countries
           select new { Country = countries.Key, Cities = countries, Total = countries.Sum(c => c.Total) };

        foreach (var country in CountryGroups)
        {
           Console.WriteLine("{0} (Total = {1})", country.Country, country.Total);
           foreach (var city in country.Cities)
           {
              Console.WriteLine("  {0} (Total = {1})", city.City, city.Total);
              foreach (var r in city.Residents)
              {
                 Console.WriteLine("    {0} {1} {2} {3}", r.Area, r.CustName, r.Gender, r.plusMinus);
              }
           }
        }
     }
  }
}