我试图使用GraphDiff(NuGet中的最新版本)来处理我认为不是非常困难的实体模型。考虑这样的模型:
class A
{
public virtual ICollection<B> Bs { get; set; }
}
class B
{
public virtual ICollection<C> Cs { get; set; }
}
如果我要更新A的实例(称之为 aEntity ),我可以这样做:
context.UpdateGraph(aEntity, map =>
map.OwnedCollection(a => a.Bs, withB =>
withB.OwnedCollection(b => b.Cs)))
现在,我有时也喜欢独立更新B。
context.UpdateGraph(bEntity, map => map.OwnedCollection(b => b.Cs));
所以我想我可以&#34;级联&#34;引入财产的变化,如下:
class BMapper {
Expression<Func<IUpdateConfiguration<B>, object>> MappingExpression
{
get
{
return map => map.OwnedCollection(b => b.Cs);
}
}
}
...然后在两种情况下都使用它:
// Update an A and any of its B's
context.UpdateGraph(aEntity, map =>
map.OwnedCollection(a => a.Bs, (new BMapper()).MappingExpression))
// Update a B by itself
context.UpdateGraph(bEntity, (new BMapper()).MappingExpression);
更新B本身可以正常工作,但更新A会在表达式中落下:
Microsoft.CSharp.RuntimeBinder.RuntimeBinderException:
'string' does not contain a definition for 'Body'
有没有办法在GraphDiff中共享映射?