使用自定义集合进行封装
我想创建自己的集合，该集合是从ReadOnLyCollection继承的，以将我的域模型逻辑封装在其中。
public class Product : Entity
{
public string Name { get; set; }
private readonly List<ProductAttachment> _attachments =
new List<ProductAttachment>();
public Attachment<ProductAttachment> Attachments => new Attachment<ProductAttachment>(_attachments);
}
public class Attachment<TFileEntity> : ReadOnlyCollection<TFileEntity> where TFileEntity : FileEntity<int>
{
public void AddAttachment(TFileEntity fileEntity)
{
Items.Add(fileEntity);
}
public Attachment(IList<TFileEntity> list) : base(list)
{
}
}
接下来，我尝试添加一个附件
foreach (var attachment in request.Attachments)
{
product.Attachments.AddAttachment(new ProductAttachment(attachment.FullName, attachment.Content))
}
，然后尝试通过_context.products.add（product）或GET添加对象后，我遇到了一个错误
。 1 [域名。
我该如何解决这个问题？我想最终得到一个自定义集合，其中逻辑被封装。 也许我做错了什么？
I want to create my own collection which is inherited from ReadOnlyCollection in order to encapsulate my domain model logic in it.
public class Product : Entity
{
public string Name { get; set; }
private readonly List<ProductAttachment> _attachments =
new List<ProductAttachment>();
public Attachment<ProductAttachment> Attachments => new Attachment<ProductAttachment>(_attachments);
}
public class Attachment<TFileEntity> : ReadOnlyCollection<TFileEntity> where TFileEntity : FileEntity<int>
{
public void AddAttachment(TFileEntity fileEntity)
{
Items.Add(fileEntity);
}
public Attachment(IList<TFileEntity> list) : base(list)
{
}
}
Next, I try to add an attachment
foreach (var attachment in request.Attachments)
{
product.Attachments.AddAttachment(new ProductAttachment(attachment.FullName, attachment.Content))
}
And after I try to add the object via _context.Products.Add(product) or get, I get an error
No coercion operator is defined between types 'System.Collections.Generic.List1[Domain.Entities.ProductAttachment]' and 'Domain.Common.Attachment1[Domain.Entities.ProductAttachment]'.
How can I solve this problem? I would like to end up with a custom collection where the logic is encapsulated.
Maybe I'm doing something wrong?
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评论（1）
您的收藏可以阅读，您会在那儿添加Elments。我认为它的坏主意。
而且，如果您可以使用
foreach循环为您的集合使用，则必须从ienumerable继承您的集合，并实现 getEnumerator 方法>返回ienumeratorienumerator < /代码>Your collection ReadOnly , and you wonna add elments there.I think its bad idea.
And if you wonna use
foreach loopfor your collection you must be inherit your collection fromIEnumerableand implementGetEnumeratormethod which returnIEnumerator