Question

我的目标是将值写入存储在集合中的预先存在的.csv文件中。目前，我正在读取存储在.csv文件中的值，并使用filerhelper库将它们存储在集合中。但是，我想添加4个列字段{产品，基本价格，发货价格，总价格}，然后，如果我的records集合中的客户名称与customerandproducts集合中的客户名称相匹配，请写入从customerandproducts集合到我添加的4个字段的相应数据。

这是我的源代码的简化版本：

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

namespace ReadFile
{
    class Program
    {
        static void Main()
        {
            var engine = new FileHelperEngine<Orders>();
            var records = engine.ReadFile("Daniel.csv");

            // var customersandproducts = addresses.Select(x => new { x.Name, x.AddressLine1, x.AddressLine2, x.City, x.State, x.S_OrderId, x.PostalCode })
            // .Join(products, custs => custs.S_OrderId, prod => prod.P_OrderId,(custs, prod) => new { custs.Name, custs.AddressLine1, custs.AddressLine2, custs.City, custs.State, custs.PostalCode, prod.Title, prod.Quantity, prod.ItemPrice, prod.ShippingPrice });

            foreach (var record in records)
            {
                Console.WriteLine(record.Name);
                Console.WriteLine(record.Track);
                Console.WriteLine(record.Price);
            }
        }
    }

    [DelimitedRecord(",")]
    public class Orders
    {
        public string Name;

        public string Track;

        public string Price;
    }
}

以下是我的.csv文件中的数据：

ShipToCompanyorName,PackageTrackingNumber,ShipmentInformationTotalShipmentReferenceCharge customer1,1Z620Y1V0347293915,12.6 customer2,1Z620Y1V0347106126,9.18 customer3,1Z620Y1V0347584931,13.63 customer4,1Z620Y1V0346366348,11.37 customer5,1Z620Y1V0348472309,31. customer6,1Z620Y1V0348325290,31.34

我的问题：我想将{Product，Base Price，Ship Price，Total Price}添加到.csv文件的第一行，然后使用客户名称在customerandproducts集合中填写每一列的信息作为关键。

Answer 1

您可以使用两个类，然后使用AutoMapper

进行映射

namespace ReadFile
{
    class Program
    {
        static void Main(string[] args)
        {
            var engine = new FileHelperEngine<Orders>();
            var records = engine.ReadFile("Daniel.csv");
            var mapped = Mapper.Map<Orders[], MoreFields[]>(records );
            // mapped is an array of the class with more fields
        }
    }

    [DelimitedRecord(",")]
    public class Orders
    {
        public string Name;

        public string Track;

        public string Price;
    }

    public class MoreFields: Orders
    {
        public string Product;
        public string BasePrice;
        ...
     }
}

Answer 2

您应该使用FieldOptional属性作为额外字段。然后它们将被忽略以进行导入，但包括用于导出。

[DelimitedRecord(",")]
public class Orders
{
    public string Name;
    public string Track;
    public string Price;
    [FieldOptional]
    public string Product
    [FieldOptional]
    public string BasePrice
    [FieldOptional]
    public string ShipPrice
    [FieldOptional]
    public string TotalPrice
}

然后像：

var engine = new FileHelperEngine<Orders>();
var records = engine.ReadFile("Daniel.csv");
// transform the collection with a foreach loop
foreach(var record in records)
{
   var customer = custs.ByName(record.Name);
   record.Product = etc...
   record.BasePrice = etc...
}
// write out the file including the optional fields.
engine.WriteFile("Daniel_transformed.csv", records);

C＃将一个元素添加到集合对象

2 个答案: