如何获取保存在对象列表中的类属性值并使用循环进行迭代

Question

这是我的课

public class Income
    {
        public string Code { get; set; }
        public int Month1 { get; set; }
        public int Month2 { get; set; }
        public int Month3 { get; set; }
        public int Month4 { get; set; }
        public int Month5 { get; set; } 
        public List<Income> income { get; set; }

    }

在另一个班级

List<Income> incomeList = new List<Income>();

//repeat twice
Income obj = new Income();
obj.Month1 = 200;
obj.Month2 = 150;
...
IncomeList.Add(obj);
obj.income = IncomeList;

现在我想为每个保存在 列表。 目前为止

Int[] results = obj.income
    .Select(x=> new 
    {
         x.Month1,
         x.Month2,
         x.Month3,
         x.Month4,
         x.Month5
     })
     .ToArray();

这是我需要为每个唯一对象添加总月数的地方。 获取所有 Months1 、 Months2 的总数 ...

double totals[] = new double[5];
 for (int i=0;i<results.length;i++)
 {
     totals[i] += results[i]; // I get the first object reference
     // I want Moth1,Month2 ... to be in an indexed array where 
     // if i want Month1 i would access similar to : results[index];
 }

Answer 1

好的，下面的代码将投影出一个对象列表。每个对象都有一个名为“Months”的属性，它是月份值的int[]。

这能满足你的需要吗？

void Main()
{ 

    var incomeList = new List<Income>();
    Income obj = new Income();
    obj.Month1 = 200;
    obj.Month2 = 150;

    incomeList.Add(obj);

    var results = incomeList
        .Select(x => new
        {
            Months = new int[]
            {
                x.Month1,
                x.Month2,
                x.Month3,
                x.Month4,
                x.Month5
            }
        })
     .ToArray();


    for (int i = 0; i < results.Length; i++)
    {
        var testResults = results[i];
        Console.WriteLine($"Month 1: {testResults.Months[0]}");
        Console.WriteLine($"Month 2: {testResults.Months[1]}");
        Console.WriteLine($"Month 3: {testResults.Months[2]}");
        Console.WriteLine($"Month 4: {testResults.Months[3]}");
        Console.WriteLine($"Month 5: {testResults.Months[4]}");
    }
}

但是，鉴于您发布的代码中的 cmets，我认为您想将其转换为二维数组。如果是这样，只需投射出int[]：

void Main()
{ 
    var incomeList = new List<Income>();
    Income obj = new Income();
    obj.Month1 = 200;
    obj.Month2 = 150;

    incomeList.Add(obj);

    int[][] results = incomeList
        .Select(x => new int[]
        {
            x.Month1,
            x.Month2,
            x.Month3,
            x.Month4,
            x.Month5
        })
     .ToArray();


    for (int i = 0; i < results.Length; i++)
    {
        var testResults = results[i];
        Console.WriteLine($"Month 1: {testResults[0]}");
        Console.WriteLine($"Month 2: {testResults[1]}");
        Console.WriteLine($"Month 3: {testResults[2]}");
        Console.WriteLine($"Month 4: {testResults[3]}");
        Console.WriteLine($"Month 5: {testResults[4]}");
    }
}