C# 如何使用Automapper将更改映射到现有集合?
我有一些相当简单的代码,可以将用户对viewmodel中集合的更改应用于模型中的集合C# 如何使用Automapper将更改映射到现有集合?,c#,generics,mapping,viewmodel,automapper,C#,Generics,Mapping,Viewmodel,Automapper,我有一些相当简单的代码,可以将用户对viewmodel中集合的更改应用于模型中的集合 public void Apply(ViewModelListItem source, ICollection<ModelListItem> dest) { //user added and removed an item before saving, do nothing if (source.Insert && source.Delete) return;
public void Apply(ViewModelListItem source, ICollection<ModelListItem> dest)
{
//user added and removed an item before saving, do nothing
if (source.Insert && source.Delete) return;
//user added an item
if (source.Insert)
{
dest.Add(Mapper.Map<T>(source));
}
//user deleted an item
else if (source.Delete)
{
//Using custom Equals implementation that compares PK
dest.Remove(dest.FirstOrDefault(destItem => source.Equals(destItem)));
}
//user modified or did not alter an item
else
{
//Using custom Equals implementation that compares PK
Mapper.Map(source, dest.FirstOrDefault(destItem => source.Equals(destItem)));
}
}
我在代码中的多个位置使用此模式,因此我正在寻找一种以通用方式重用代码的方法。Automapper是否有一种方法可以简单地将引用传递到源/目标,并让我在其上运行自己的设置逻辑?如果没有,是否有其他方法可以使此代码通用,这样我就不必为每个新的viewmodel编写代码?我的解决方案:
Viewmodel的基类:
public abstract class ListItemViewModel<T>
{
public bool Insert { get; set; }
public bool Delete { get; set; }
public abstract bool Equals(T model);
public virtual void OnRemove(T model) { }
public virtual void OnAdd(T model) { }
public virtual void OnEdit(T model) { }
}
此代码将执行以下操作:
.ForMember(m => m.MyList, opt => opt.Ignore())
.AfterMap((vm, m) => MapConfiguration.MapCollection(vm.MyList, m.MyList))
- 如果设置了
标志,则向收藏中添加新项目Insert
- 如果设置了
标志,则从收藏中删除项目Remove
- 如果未设置任何标志,则执行自动映射
你找到答案了吗?我有同样的问题。添加我的解决方案作为答案。注意:我最终出于其他原因放弃了automapper,但在映射集合时仍然使用相同的想法,只是减去了automapper集成。
public static class MapConfiguration
{
public static void MapCollection<T>(IEnumerable<ListItemViewModel<T>> source, ICollection<T> dest)
{
foreach (var sourceItem in source)
{
//user added and removed an item before saving, do nothing
if (sourceItem.Insert && sourceItem.Delete) continue;
//user added an item
if (sourceItem.Insert)
{
var destItem = Mapper.Map<T>(sourceItem);
sourceItem.OnAdd(destItem);
dest.Add(destItem);
}
//user deleted an item
else if (sourceItem.Delete)
{
//Using custom Equals implementation that compares PK
var destItem = dest.First(d => sourceItem.Equals(d));
sourceItem.OnRemove(destItem);
dest.Remove(destItem);
}
//user modified or did not alter an item
else
{
//Using custom Equals implementation that compares PK
var destItem = dest.First(d => sourceItem.Equals(d));
sourceItem.OnEdit(destItem);
Mapper.Map(sourceItem, destItem);
}
}
}
}
.ForMember(m => m.MyList, opt => opt.Ignore())
.AfterMap((vm, m) => MapConfiguration.MapCollection(vm.MyList, m.MyList))