我能实现在C＃中，从派生类拷贝“的拷贝构造函数”？ [英] Can I achieve a 'copy constructor' in C# that copies from a derived class?

问题描述

这是应用具体的例子来说明我的眼前的问题：

An application specific example to illustrate my immediate problem:

我有一个元数据提供程序类具有以下（有删节）接口：

I have a metadata provider class with the following (abridged) interface:

public class CtsDataAnnotationsModelMetadataProvider : DataAnnotationsModelMetadataProvider
{
    protected override ModelMetadata CreateMetadata(IEnumerable<Attribute> attributes, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName)
    {
        var metadata = base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);
        return metadata;
    }
}

现在我想延长 ModelMetadata 具有附加属性，这些填充并返回和 ExtendedModelMetadata 的实例。我怎样才能很好地传达我的延长例如通过 base.CreateMetadata 分配给元实例属性？我想，但没有为;

Now I would like to extend ModelMetadata with additional properties, populate these and return and instance of ExtendedModelMetadata. How can I nicely convey properties assigned to the metadata instance by base.CreateMetadata in my extended instance? What I would like but don't have is;

var metadata = (ExtendedModelMetadata)base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);

我可以创建一个构造 ExtendedModelMetadata ，需要一个 ModelMetadata 参数，并明确赋予它的所有属性的比如正在建设中，但我想这一个更通用和更少的硬件codeD的方法。我该怎么办？

I can create a constructor for ExtendedModelMetadata that takes a ModelMetadata parameter and explicitly assigns all of it's properties to the instance being constructed, but I would like a more generic and less hard-coded approach for this. What can I do?

推荐答案

您可以使用 AutoMapper 实现这一目标。

You can use AutoMapper to achieve this.

Mapper.CreateMap<ModelMetaData , ExtendedModelMetadata>();

.NET Framework不提供了深刻的复印功能。

.NET Framework does not provide a deep copy feature.

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