在基类参数被 new 关键字隐藏的模型上运行 EntitySet<> 时可能出现 ODataConventionModelBuilder 错误

Question

考虑 Microsoft 示例项目对象的基类 WeatherForcast：

public enum CloudType { A = 1, B = 2 } 

public class WeatherForecastBase { public int CloudType { get; set; }} 

public class WeatherForecast : WeatherForecastBase { 

    public Guid Id { get; set; }
    
    public DateTime Date { get; set; }
    
    public int TemperatureC { get; set; }
    
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
    
    public string Summary { get; set; }
    
    public virtual Person WeatherPerson { get; set; }
    
    public virtual IList<Location> Locations { get; set; }
    
    public virtual Location Location { get; set; }
    
    public Address Address { get; set; }
    
    public bool IsCloudy { get; set; }
    
    public new CloudType CloudType { get; set; } }

CloudType

（int）属性被子类隐藏，新属性也改变了它的类型（

CloudType

枚举）。有没有办法让

ODataConventionModelBuilder

成功构建 WeatherForecast 模型并忽略

CloudType

的基类版本？在我的用例中，我收到有关属性必须是原始类型的错误。

Answer 1

我尝试使用通用类型，这可能是你的解决方法：

 public class WeatherForecastBase<T>  {  public virtual T CloudType { get; set; } }

 public class WeatherForecast<T> : WeatherForecastBase<T>
 {

     public Guid Id { get; set; }

     public DateTime Date { get; set; }

     public int TemperatureC { get; set; }

     public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);

     public string? Summary { get; set; }

     public bool IsCloudy { get; set; }

    
 }

在 Program.cs 中：

var modelBuilder = new ODataConventionModelBuilder();    
modelBuilder.EntitySet<WeatherForecast<CloudType>>("WeatherForecast");
builder.Services.AddControllers().AddOData(
    options => options.Select().Filter().OrderBy().Expand().Count().SetMaxTop(null).AddRouteComponents(
        "odata",
        modelBuilder.GetEdmModel()));