c# - 如何防止列表中的项目在未填写时返回 "0"并且它们应该是 "null"？

Question

这是一个很难问的问题，但这是我的问题:
我正在使用从不同类获得的数据填充网格，该类使用可以表示多个模型的(通用)模型:
型号(可代表Vessel 或Container):

public class DataGridInstallationRow
{
    [Key]
    public string Name { get; set; }

    //Vessel
    public int IMO { get; set; }
    public int MMSI { get; set; }
    public int EEOI { get; set; }
    public int FOC { get; set; }

    [Display(Name = "Total Fuel Mass")]
    public int TotalFuelMass { get; set; }

    [Display(Name = "Average Speed")]
    public int AverageSpeed { get; set; }

    [Display(Name = "Total Distance Sailed")]
    public int TotalDistanceSailed { get; set; }

    //Container
    [Display(Name = "Generated by Sun")]
    public int EnergyGeneratedBySun { get; set; }
    [Display(Name = "Generated by Wind")]
    public int EnergyGeneratedByWind { get; set; }
    [Display(Name = "Generated by Generator")]
    public int EnergyGeneratedByGenerator { get; set; }
    [Display(Name = "Consumed by EV's")]
    public int EnergyConsumedByEV { get; set; }
    [Display(Name = "Consumed by Construction Site")]
    public int EnergyConsumedByConstructionSite { get; set; }
}

此模型用于我的提供程序:

        if (fleet.Type.Equals("Container"))
        {
            return Enumerable.Range(0, 10).Select(i => new DataGridInstallationRow()
            {
                Name = $"Container {i}",
                EnergyGeneratedBySun = 13,
                EnergyGeneratedByWind = 19,
                EnergyGeneratedByGenerator = 3,
                EnergyConsumedByEV = 15,
                EnergyConsumedByConstructionSite = 24
            }).ToList();
        }
        else
        {
            return Enumerable.Range(0, 10).Select(i => new DataGridInstallationRow()
            {
                Name = $"Vessel {i}",
                IMO = 231,
                MMSI = 1344,
                EEOI = 8121,
                FOC = 123,
                TotalFuelMass = 6817,
                AverageSpeed = 14,
                TotalDistanceSailed = 1560
            }).ToList();
        }

如您所见，根据 Fleet.Type，填充另一个。如果 Fleet.Type 是容器，则对象将如下所示:

正如您所看到的，“Vessel”的属性也全部填充为“0”，我希望它们为空而不是“0”，因为我的数据网格现在填充了两种模型:

避免和解决此问题的最佳做法是什么？
更新
Dogac的应用解决方案:

if (fleet.Type.Equals("Container"))
        {
            return Enumerable.Range(0, 10).Select(i => new DataGridInstallationRow()
            {
                Name = $"Container {i}",
                EnergyGeneratedBySun = 13,
                EnergyGeneratedByWind = 19,
                EnergyGeneratedByGenerator = 3,
                EnergyConsumedByEV = 15,
                EnergyConsumedByConstructionSite = 24
            }).Where(row =>
            {
                return row.EnergyGeneratedBySun.HasValue &&
                       row.EnergyGeneratedByWind.HasValue &&
                       row.EnergyGeneratedByGenerator.HasValue &&
                       row.EnergyConsumedByEV.HasValue &&
                       row.EnergyConsumedByConstructionSite.HasValue;
            }).ToList();
        }
        else
        {
            return Enumerable.Range(0, 10).Select(i => new DataGridInstallationRow()
            {
                Name = $"Vessel {i}",
                IMO = 231,
                MMSI = 1344,
                EEOI = 8121,
                FOC = 123,
                TotalFuelMass = 6817,
                AverageSpeed = 14,
                TotalDistanceSailed = 1560
            }).Where(row =>
            {
                return row.IMO.HasValue &&
                       row.MMSI.HasValue &&
                       row.EEOI.HasValue &&
                       row.FOC.HasValue &&
                       row.TotalFuelMass.HasValue &&
                       row.AverageSpeed.HasValue &&
                       row.TotalDistanceSailed.HasValue;
            }).ToList();
        }   

仍然无法正常工作，我再次收到一个包含可为空项目的列表。
提前致谢

Answer 1

尝试使所有属性都可以为空。
像这样:

// Vessel
public int? IMO { get; set; }
public int? MMSI { get; set; }
public int? EEOI { get; set; }
public int? FOC { get; set; }

编辑评论:

Enumerable.Range(0, 10).Select(i => new DataGridInstallationRow()
            {
                Name = $"Vessel {i}",
                IMO = 231,
                MMSI = 1344,
                EEOI = 8121,
                FOC = 123,
                TotalFuelMass = 6817,
                AverageSpeed = 14,
                TotalDistanceSailed = 1560
            }).Where(row =>
            {
                return row.IMO.HasValue && 
                       row.MMSI.HasValue && 
                       row.EEOI.HasValue && 
                       row.FOC.HasValue && 
                       row.TotalFuelMass.HasValue && 
                       row.AverageSpeed.HasValue && 
                       row.TotalDistanceSailed.HasValue;
            }).ToList();