C# 将可空int映射到可空int+;汽车制造商
我需要通过autompper将一个可为null的int映射到一个可为null的int 这是我的班级事件:C# 将可空int映射到可空int+;汽车制造商,c#,entity-framework,mapping,automapper,C#,Entity Framework,Mapping,Automapper,我需要通过autompper将一个可为null的int映射到一个可为null的int 这是我的班级事件: public class Incident : Evenement { public Incident() : base(-1, Global.EvenementType.Incidents, DateTime.MinValue) { } public Incident(int id, DateTime date, string libell
public class Incident : Evenement
{
public Incident()
: base(-1, Global.EvenementType.Incidents, DateTime.MinValue)
{
}
public Incident(int id, DateTime date, string libelle, int formulaireId, string societe, string userName)
: base(id, (int)Global.EvenementType.Incidents, date, libelle, "", "", societe)
{
ContratId = formulaireId;
Contrat = null;
UserName = userName;
}
public Incident(int id, DateTime date, string libelle, string societe, string userName)
: base(id, (int)Global.EvenementType.Incidents, date, libelle, "", "", societe)
{
ContratId = null;
Contrat = null;
UserName = userName;
}
[DataMember]
public int? ContratId { get; set; }
[DataMember]
public Contrat Contrat { get; set; }
[DataMember]
public string UserName { get; set; }
[DataMember]
public bool IsGeneral
这是我的班级事件
public partial class INCIDENT : EVENEMENT
{
public Nullable<int> FORMULAIRE_ID { get; set; }
public virtual FORMULAIRE FORMULAIRE { get; set; }
public string USERNAME { get; set; }
}
公共部分课程事件:晚上
{
公共可为空的FORMULAIRE_ID{get;set;}
公共虚拟公式化公式化{get;set;}
公共字符串用户名{get;set;}
}
当我在做映射时,contractid dans事件中有一个空值,它在类事件中的FORMULAIRE_ID中自动转换为0
public partial class INCIDENT : EVENEMENT
{
public Nullable<int> FORMULAIRE_ID { get; set; }
public virtual FORMULAIRE FORMULAIRE { get; set; }
public string USERNAME { get; set; }
}
这是我的装订
Mapper.CreateMap<Incident, INCIDENT>()
.ForMember(degivreuse => degivreuse.FORMULAIRE_ID, expression => expression.MapFrom(degivreuse => degivreuse.ContratId))
.ForMember(degivreuse => degivreuse.FORMULAIRE, expression => expression.Ignore());
Mapper.CreateMap()
.ForMember(degivreuse=>degivreuse.FORMULAIRE_ID,expression=>expression.MapFrom(degivreuse=>degivreuse.contractid))
.ForMember(degivreuse=>degivreuse.FORMULAIRE,expression=>expression.Ignore());
在PJ中,问题是:
你知道我为什么不获取空值吗
关于我没有发现Automapper处理
int?
的方式有任何问题。下面是一个很好用的快速示例:
public class Src1
{
public string Name { get; set; }
public int? Age { get; set; }
}
public class Dest1
{
public string Name { get; set; }
public Nullable<int> Age { get; set; }
}
Mapper.CreateMap<Src1, Dest1>();
Mapper.AssertConfigurationIsValid();
var s = new Src1 {Name = "aaa", Age = null};
var d = Mapper.Map<Src1, Dest1>(s);
公共类Src1
{
公共字符串名称{get;set;}
公共整数{get;set;}
}
公共类Dest1
{
公共字符串名称{get;set;}
公共可空年龄{get;set;}
}
CreateMap();
assertConfigurationsValid();
var s=newsrc1{Name=“aaa”,Age=null};
var d=映射器.Map(s);
在上面的示例中,
d.Age
为null
。您能提供一些示例代码来重现您看到的问题吗?今天,我在AutoMapper 10.1.1
中偶然发现了同样的问题。
我试图将我的自定义类映射到DinkToPdf库中的MarginSettings类。
MarginSettings类有2个构造函数:
public class MarginSettings
{
public Unit Unit { get; set; }
public double? Top { get; set; }
public double? Bottom { get; set; }
public double? Left { get; set; }
public double? Right { get; set; }
public MarginSettings()
{
Unit = Unit.Millimeters;
}
public MarginSettings(double top, double right, double bottom, double left) : this()
{
Top = top;
Bottom = bottom;
Left = left;
Right = right;
}
// the rest of class..
}
似乎出于某种原因,当AutoMapper试图将我的自定义类映射到它时,它正在调用MarginSettings类中带有参数的构造函数。这样,默认的double
值(0)在此构造函数中设置为double?
属性
下面是演示此问题的代码:
class SourceClass
{
public double? Top { get; set; }
public double? Bottom { get; set; }
public double? Left { get; set; }
public double? Right { get; set; }
}
class ClassWithoutCtor
{
public double? Top { get; set; }
public double? Bottom { get; set; }
public double? Left { get; set; }
public double? Right { get; set; }
}
// The class similar to one in DinkToPdf library
class ClassWithCtor
{
public string Message1 { get; set; }
public string Message2 { get; set; }
public double? Top { get; set; }
public double? Bottom { get; set; }
public double? Left { get; set; }
public double? Right { get; set; }
public ClassWithCtor() => this.Message1 = "in default ctor";
public ClassWithCtor(double top, double right, double bottom, double left)
: this()
{
this.Top = new double?(top);
this.Bottom = new double?(bottom);
this.Left = new double?(left);
this.Right = new double?(right);
Message2 = "in ctor with parameters";
}
}
class AutoMapperTest
{
public void TryMapZeros()
{
var source = new SourceClass
{
Top = 5,
Bottom = 5
};
var mapConfiguration = new MapperConfiguration(
cfg =>
{
cfg.CreateMap<SourceClass, ClassWithoutCtor>();
cfg.CreateMap<SourceClass, ClassWithCtor>();
}
);
var mapper = mapConfiguration.CreateMapper();
var margin1 = mapper.Map<SourceClass, ClassWithoutCtor>(source);
var margin2 = mapper.Map<SourceClass, ClassWithCtor>(source);
}
}
您的代码应该成功地将null映射到null。我将从检查
FORMULAIRE\u ID
的所有写入用法开始。可能它的值在属性映射后改变了(在另一个属性设置器或其他什么东西中?)。不,它无论如何都不会改变!!!