如何将 3 个单独的列表合并为 1 个包含 3 个列或字段的列表？

Question

如何在 c# 中将 3 个单独的列表合并为一个具有 3 个列或字段的列表？

我尝试使用 3 个 foreach 循环将 3 个单独的列表添加/组合到每个列或字段到一个列表中，但它一次只添加一个列/字段，并且列表是我需要的 3 倍是并且只有一列/字段的数据，而其他两列/字段为空或零。像这样：

0 0 3.701

0 0 3.633

0 0 3.622

0 0 3.623

我需要它是这样的：

12 2020 3.623 

这是我的代码。

        List<GasPrices> listOfGasPrices = new List<GasPrices>()
        {
        new GasPrices() { Month = 11, Year = 1942, Price = 3.333 }

        };

        foreach (var month in intMonthList)
        {
            listOfGasPrices.Add(new GasPrices { Month = month }); 
            
        }

        foreach (var year in intYearList)
        {
            listOfGasPrices.Add(new GasPrices { Year = year });

        }

        foreach (var price in doublePriceList)
        {
            listOfGasPrices.Add(new GasPrices { Price = price });
        }

        for (int k = 0; k < listOfGasPrices.Count; k++)
        {
            Console.WriteLine(listOfGasPrices[k].Month + " " + listOfGasPrices[k].Year + " " + listOfGasPrices[k].Price);
        }
    


class GasPrices
{
    //backing fields
    private int _month, _year;
    private double _price;

    //constructor
    public GasPrices()
    {
        _month=0;
        _year=0;
        _price=0;
    }

    //getter and setters of properties
    public int Month { get; set; }
    public int Year { get; set; }
    public double Price { get; set; }

}

Answer 1

请添加有关如何配置月、年和价目表的更多详细信息。

• 假设 intYearList 有一个年份范围：例如1950-2020

• 假设 intMonthList 有 12 个月，即 1-12

• 假设 doublePriceList 是一个平面系列。

   int yearIndex = 0;        
  
   foreach(var year in intYearList)
   {
      int monthIndex = 0;
      foreach(var month in intMonthList)
      { 
        var priceIndex = yearIndex*12 + monthIndex;
        var price = doublePriceList[priceIndex];
  
        listOfGasPrices.Add(new GasPrices { Month = month, Year = year, Price = price });
  
        monthIndex++;
  
      }
  
       yearIndex++;
  
    }
  

Answer 2

不要这样使用三个 foreach 循环，而是使用以下代码

List<int> intMonthList = new List<int>() { 1, 2, 3 }; // Taking sample values
List<int> intYearList = new List<int>() { 2019, 2020, 2021 };
List<double> doublePriceList = new List<double>() { 7.1, 8.2, 9.3 };

List<GasPrices> listOfGasPrices = new List<GasPrices>()
{
    new GasPrices() { Month = 11, Year = 1942, Price = 3.333 }

};

using(var month = intMonthList.GetEnumerator())
using(var year = intYearList.GetEnumerator())
using(var price = doublePriceList.GetEnumerator())
{
    while(month.MoveNext() && year.MoveNext() && price.MoveNext())
    {
        listOfGasPrices.Add(new GasPrices { Month = month.Current, Year = year.Current, Price = price.Current });

    }
}

for (int k = 0; k < listOfGasPrices.Count; k++)
{
    Console.WriteLine(listOfGasPrices[k].Month + " " + listOfGasPrices[k].Year + " " + listOfGasPrices[k].Price);
}