[英]Automapper enum to Enumeration Class
I'm trying to use Automapper to map from a regular enum to an Enumeration Class (as described by Jimmy Bogard - http://lostechies.com/jimmybogard/2008/08/12/enumeration-classes/ ). 我正在尝试使用Automapper从常规枚举映射到枚举类(如Jimmy Bogard所述 - http://lostechies.com/jimmybogard/2008/08/12/enumeration-classes/ )。 The regular enum doesn't have the same values as the enumeration class does.
常规枚举与枚举类的值不同。 I would therefore like to map using the Name if possible:
因此,如果可能,我想使用名称进行映射:
Enum: 枚举:
public enum ProductType
{
ProductType1,
ProductType2
}
Enumeration Class: 枚举类:
public class ProductType : Enumeration
{
public static ProductType ProductType1 = new ProductType(8, "Product Type 1");
public static ProductType ProductType2 = new ProductType(72, "Product Type 2");
public ProductType(int value, string displayName)
: base(value, displayName)
{
}
public ProductType()
{
}
}
Any help to make this mapping work appreciated! 任何帮助使这个映射工作赞赏! I have attempted just a regular mapping:
我尝试过一个常规映射:
Mapper.Map<ProductType, Domain.ProductType>();
.. but the mapped type has a value of 0. ..但映射类型的值为0。
Thanks, Alex 谢谢,亚历克斯
Here is how Automapper works - it gets public instance properties/fields of destination type, and matches the with public instance properties/fields of source type. 以下是Automapper的工作原理 - 它获取目标类型的公共实例属性/字段,并匹配源类型的公共实例属性/字段。 Your enum does not have public properties.
你的枚举没有公共属性。 Enumeration class has two - Value and DisplayName.
枚举类有两个 - Value和DisplayName。 There is nothing to map for Automapper.
没有任何地方可以映射Automapper。 Best thing you can use is simple mapper function (I like to use extension methods for that):
你可以使用的最好的东西是简单的映射器函数(我喜欢使用扩展方法):
public static Domain.ProductType ToDomainProductType(
this ProductType productType)
{
switch (productType)
{
case ProductType.ProductType1:
return Domain.ProductType.ProductType1;
case ProductType.ProductType2:
return Domain.ProductType.ProductType2;
default:
throw new ArgumentException();
}
}
Usage: 用法:
ProductType productType = ProductType.ProductType1;
var result = productType.ToDomainProductType();
If you really want to use Automapper in this case, you ca provide this creation method to ConstructUsing
method of mapping expression: 如果您真的想在这种情况下使用Automapper,那么您可以将此创建方法提供给
ConstructUsing
映射表达式的方法:
Mapper.CreateMap<ProductType, Domain.ProductType>()
.ConstructUsing(Extensions.ToDomainProductType);
You also can move this creation method to Domain.ProductType
class. 您还可以将此创建方法移动到
Domain.ProductType
类。 Then creating its instance from given enum value will look like: 然后从给定的枚举值创建其实例将如下所示:
var result = Domain.ProductType.Create(productType);
UPDATE: You can use reflection to create generic method which maps between enums and appropriate enumeration class: 更新:您可以使用反射创建通用方法,该方法在枚举和适当的枚举类之间进行映射:
public static TEnumeration ToEnumeration<TEnum, TEnumeration>(this TEnum value)
{
string name = Enum.GetName(typeof(TEnum), value);
var field = typeof(TEnumeration).GetField(name);
return (TEnumeration)field.GetValue(null);
}
Usage: 用法:
var result = productType.ToEnumeration<ProductType, Domain.ProductType>();
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