Question

public class Budget
{
    public string SeasonNo { get; set; }
    public string SeasonName { get; set; }
    public string typeProductCd { get; set; }
    public string typeProductDescription { get; set; }
    public Decimal UsdBudgetRetail { get; set; }
}

List<Budget> list1

List<Budget> list2

List<Budget> ListUngrouped =
    list1.Concat(list2).ToList();

List<Budget> listGrouped = ListUngrouped
    .GroupBy(x => new { x.SeasonNo, x.typeProductCd })
    .Select(group => new { group.Key, UsdBudgetRetail = group.Sum(x => x.UsdActualRetail) })
    .Cast<BudgetAndActualLineInfoBySeasonDto>()
    .ToList();

Answer 1

目前还不清楚你想要完成什么。以下是您现在需要解决的代码问题：

Budget不包含UsdActualRetail的定义。
List<BudgetAndActualLineInfoBySeasonDto>无法投放到List<Budget>。
无法隐式将group对象投放到BudgetAndActualLineInfoBySeasonDto。
我已修复BUDGET，concat和toList的拼写错误。
为了使分组正常运行，您需要为GroupBy对象提供自定义实现以进行相等比较。

通过一系列疯狂的猜测，了解您希望此代码如何工作以及其他缺失类的定义可能是什么，这里是一个（LinqPad-ready）complete working code sample，它显示了分组的值和总和，使用有效的自定义等式实现：

void Main()
{
    List<Budget> list1 = new List<Budget>() {
        new Budget { SeasonNo = "1", SeasonName = "Test 1", typeProductCd = "3", UsdActualRetail = 1.01m },
        new Budget { SeasonNo = "1", SeasonName = "Test 2", typeProductCd = "3", UsdActualRetail = 1.01m },
        new Budget { SeasonNo = "1", SeasonName = "Test 3", typeProductCd = "3", UsdActualRetail = 1.01m },
        new Budget { SeasonNo = "1", SeasonName = "Test 4", typeProductCd = "3", UsdActualRetail = 1.01m },
    };

    List<Budget> list2 = new List<Budget>() {
        new Budget { SeasonNo = "2", SeasonName = "Test 5", typeProductCd = "4", UsdActualRetail = 1.02m },
        new Budget { SeasonNo = "2", SeasonName = "Test 6", typeProductCd = "4", UsdActualRetail = 1.02m },
        new Budget { SeasonNo = "2", SeasonName = "Test 7", typeProductCd = "4", UsdActualRetail = 1.02m },
    };

    List<Budget> listUngrouped = list1.Concat(list2).ToList();

    List<BudgetAndActualLineInfoBySeasonDto> listGrouped = 
        listUngrouped
            .GroupBy(x => new SeasonDto { SeasonNo = x.SeasonNo, typeProductCd = x.typeProductCd })
            .Select(group => new BudgetAndActualLineInfoBySeasonDto {
                SeasonDto = group.Key,
                UsdBudgetRetail = group.Sum(x => x.UsdActualRetail)
            })
            .Cast<BudgetAndActualLineInfoBySeasonDto>()
            .ToList();
    Console.WriteLine(listGrouped);
}

// Define other methods and classes here

public class SeasonDto
{
    public string SeasonNo { get; set; }
    public string typeProductCd { get; set; }

    public override bool Equals(object other)
    {
        SeasonDto otherS = other as SeasonDto;
        if (otherS != null)
        {
            return this.SeasonNo.Equals(otherS.SeasonNo) &&
                this.typeProductCd.Equals(otherS.typeProductCd);
        }
        else
        {
            return false;
        }
    }

    public override int GetHashCode()
    {
        return SeasonNo.GetHashCode() + typeProductCd.GetHashCode();
    }
}

public class BudgetAndActualLineInfoBySeasonDto
{
    public SeasonDto SeasonDto { get; set; }
    public decimal UsdBudgetRetail { get; set; }
}

public class Budget
{
        public string SeasonNo { get; set; }
        public string SeasonName { get; set; }
        public string typeProductCd { get; set; }
        public string typeProductDescription { get; set; }
        public Decimal UsdActualRetail { get; set; }
}

希望这有帮助！如果您可以大大改善您的问题，我们将能够更好地帮助您。

Linq Group按列表<object> sum </object>

1 个答案: