我有以下课程。
public class Response
{
List<Make> Makes { get; set; }
public Response()
{
this.Makes = new List<Make>();
}
}
public class Make
{
public string Name { get; set; }
public List<Agent> Agents { get; set; }
public Make()
{
this.Agents = new List<Agent>();
}
}
public class Agent
{
public int Id { get; set; }
public string Name { get; set; }
public List<Offer> Offers { get; set; }
public Agent()
{
this.Offers = new List<Offer>();
}
}
public class Offer
{
public int Id { get; set; }
public List<Model> Models { get; set; }
public Offer()
{
this.Models = new List<Model>();
}
}
public class Model
{
public string Name { get; set; }
public Price Price { get; set; }
public Model()
{
this.Price = new Price();
}
}
public class Price
{
public decimal Total { get; set; }
public decimal Vat { get; set; }
}
使用linq如何获取最便宜的型号首先订购的Make列表。另外，我希望每个代理的模型首先以最便宜的价格订购。
答案 0 :(得分：1)
最简单的方法是将数据放入数据表等扁平对象中，然后进行排序：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace ConsoleApplication98
{
class Program
{
static void Main(string[] args)
{
Response response = new Response() {
Makes = new List<Make>() {
new Make() {
Name = "AAA", Agents = new List<Agent>() {
new Agent() {
Id = 123, Name = "SSS", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
},
new Agent() {
Id = 456, Name = "SST", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
}
}
},
new Make() {
Name = "AAB", Agents = new List<Agent>() {
new Agent() {
Id = 123, Name = "SSS", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
},
new Agent() {
Id = 456, Name = "SST", Offers = new List<Offer>() {
new Offer() {
Id = 100, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}},
},
},
new Offer() {
Id = 200, Models = new List<Model>() {
new Model() { Name = "TTT", Price = new Price() { Total = 1.0M, Vat = 2.0M}},
new Model() { Name = "UUU", Price = new Price() { Total = 2.0M, Vat = 3.0M}}
}
}
}
}
}
}
}
};
DataTable dt = new DataTable();
dt.Columns.Add("Make Name", typeof(string));
dt.Columns.Add("Agent ID", typeof(int));
dt.Columns.Add("Agent Name", typeof(string));
dt.Columns.Add("Offer ID", typeof(int));
dt.Columns.Add("Model Name", typeof(string));
dt.Columns.Add("Total", typeof(decimal));
dt.Columns.Add("Vat", typeof(decimal));
foreach (Make make in response.Makes)
{
string makeName = make.Name;
foreach (Agent agent in make.Agents)
{
int agentID = agent.Id;
string agentName = agent.Name;
foreach (Offer offer in agent.Offers)
{
int offerID = offer.Id;
foreach (Model model in offer.Models)
{
string modelName = model.Name;
decimal vat = model.Price.Vat;
decimal total = model.Price.Total;
dt.Rows.Add(new object[] {
makeName,
agentID,
agentName,
offerID,
modelName,
vat,
total
});
}
}
}
}
dt = dt.AsEnumerable().OrderBy(x => x.Field<decimal>("Total")).CopyToDataTable();
}
}
public class Response
{
public List<Make> Makes { get; set; }
public Response()
{
this.Makes = new List<Make>();
}
}
public class Make
{
public string Name { get; set; }
public List<Agent> Agents { get; set; }
public Make()
{
this.Agents = new List<Agent>();
}
}
public class Agent
{
public int Id { get; set; }
public string Name { get; set; }
public List<Offer> Offers { get; set; }
public Agent()
{
this.Offers = new List<Offer>();
}
}
public class Offer
{
public int Id { get; set; }
public List<Model> Models { get; set; }
public Offer()
{
this.Models = new List<Model>();
}
}
public class Model
{
public string Name { get; set; }
public Price Price { get; set; }
public Model()
{
this.Price = new Price();
}
}
public class Price
{
public decimal Total { get; set; }
public decimal Vat { get; set; }
}
}
答案 1 :(得分：0)
验证是否提供了样本值和所需的结果会更容易，但这是我使用LINQ单线订购Makes的看法：
response.Makes.OrderBy(
make => make.Agents.Select(
agent => agent.Offers.Min(
offer => offer.Models.OrderBy(model => model.Price.Total)
.First().Price.Total)));
以下是流程（内部项目符号启用外部项目符号）：
我不能完全确定上面的流程是否有意义，但是请给实现一个机会！