使用 С# CSVHELPER 从 CSV 获取值时,代码重复

The code is duplicated when getting values from CSV with С# CSVHELPER

读取CSV时方法中代码重复。如何删除重复项以及为什么会出现重复项?写入 CSV 时没有它们,但在读取时,重复项开始:

方法:

public class Program
{

    public class Product
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public Product(int id, string name)
        {
            Id = id;
            Name = name;
        }
    }

    public static void Main(string[] args)
    {
        Research();
    }

    public static void Research()
    {

            using (var writer = new StreamWriter("C:\Users\Saint\Desktop\TaskRetail\file.csv", false, Encoding.UTF8))
            using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
            {
                csv.WriteRecords(products);
            }

            var config = new CsvConfiguration(CultureInfo.InvariantCulture) 
            { 
            Delimiter = ",",
            PrepareHeaderForMatch = header => header.Header.ToLower()
            };

            using (var reader = new StreamReader("C:\Users\Saint\Desktop\TaskRetail\file.csv", Encoding.UTF8))
            using (var csv = new CsvReader(reader, config))

            {
                var records = csv.GetRecords<Product>();

                foreach (var record in records)
                {
                    Console.WriteLine($"{record.Id} {record.Name}");
               }
            }
        }
    }
}

输出到控制台:

问题是您在创建产品的循环中包含了 CSV 文件的写入和读取。您的第一个产品已创建,它被写入 CSV 文件,然后被读取并打印到您的控制台。循环继续并创建您的第二个产品。产品 1 和产品 2 被写入 CSV 文件,然后它们都从 CSV 文件中读取并打印到您的控制台。这对创建的每个产品都会继续,这就是您在控制台中显示重复项的原因。在写入 file.csv

之前,您需要关闭 for 循环
for (var i = 0; i < count; i++)
{
    var element = xmlDoc.Item(i);
    var id = int.Parse(element.Attributes.GetNamedItem("id").Value);
    var name = element.SelectSingleNode("name").InnerText;
    var product = new Product(id, name);
    //Console.WriteLine($"Id: {id}, name: {name}");

    products.Add(product);

} // Close your loop here!!

using (var writer = new StreamWriter("C:\Users\Saint\Desktop\TaskRetail\file.csv", false, Encoding.UTF8))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
    csv.WriteRecords(products);
}