如何在 C# 中初始化具有嵌套对象的对象？答案

【问题标题】：How to initialize an object that has nested objects in C#?如何在 C# 中初始化具有嵌套对象的对象？
【发布时间】：2021-04-09 20:03:00
【问题描述】：

我有一个类 BaseRequest，它有另一个类作为它的属性之一。该类有自己的一组属性，其中一些也是类，而其中一些类属性是类。如何初始化 ProductOptions-GroupsToRun 和 SelectionTargets 的 BaseRequest？

BaseRequest.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Redundent.Models
{
    public class BaseRequest
    {
        public ProductOptions ProductOptions { get; set; }
        public string RequestingSystem { get; set; }
        public bool HasDeposit { get; set; }
        public decimal? PurchasePrice { get; set; }
        public decimal? PaymentAmount { get; set; }
    }
}

ProductOptions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Redundent.Models
{
    public class ProductOptions
    {
        public GroupOption[] GroupsToRun { get; set; }
        public string Requestor { get; set; }
        public SelectionTargets SelectionTargets { get; set; }
        public string Partner { get; set; }

    }
}

GroupOption.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Redundent.Models
{
    public class GroupOption
    {
        public TransportationType TransportationType { get; set; }
        public RegistrationType Type { get; set; }

    }
}

TransportationType 和 RegistrationType 是枚举。交通类型有汽车、飞机、船、巴士和 RegistrationType 有 Ticket、ID、Passport

SelectionTargets.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Redundent.Models
{
    public class SelectionTargets
    {
        public PricingOptionTargets PricingOptionTargets { get; set; }
        public ProductTargets ProductTargets { get; set; }
    }
}

这就是我开始的...

    var baseRequest = new BaseRequest()
            {
                
                ProductOptions = { GroupsToRun = {//not sure what to do here.  Tried TransportationType.Car but got "does not contain a definition for 'Add' and no accessible extension method 'Add'}, Requestor = "Ford", SelectionTarget = {also not sure what to do here}, Partner = 
                "Heuwett B." },

                
            };

【问题讨论】：

标签： c# class object inner-classes

【解决方案1】：

GroupsToRun 字段是一个数组，因此必须使用数组初始化程序来创建数组。查看以下示例：

var baseRequest = new BaseRequest()
{
    ProductOptions = new ProductOptions
    {
        GroupsToRun = new[]
        {
            new GroupOption
            {
                TransportationType = new TransportationType {}
            }
        }, 
        Requestor = "Ford",
        SelectionTargets = new SelectionTargets
        {
            PricingOptionTargets = new PricingOptionTargets(),
            ProductTargets = new ProductTargets()
        }, 
        Partner = "Heuwett B."
    },
};

【讨论】：