[英]How to create generic mapping with AutoMapper and ConstructUsing
I have a map configuration: 我有一个地图配置:
Mapper.Initialize(cfg =>
{
cfg.CreateMap<IDictionary<int, MyType1>, List<MyType1>>().ConstructUsing(
x0 => x0?.OrderBy(x => x.Key).Select(x => x.Value).ToList());
});
How can I change this to work with "all MyTypes"? 如何更改它以与“所有MyTypes”一起使用?
I want to convert from IDictionary<int, T>
to List<T>
for any T type. 我想将任何T类型从IDictionary<int, T>
转换为List<T>
。
I found a very ugly solution: 我发现一个非常丑陋的解决方案:
cfg.CreateMap(typeof(IDictionary<,>), typeof(List<>)).ConstructUsing(
x0 =>
{
if (x0 == null)
{
return null;
}
var dict = (IEnumerable)x0;
var type = x0.GetType().GetGenericArguments()[1];
var list = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(type));
CastDictionaryEntry(dict).OrderBy(x => x.Key).ForEach(x => list.Add(x.Value));
return list;
}
);
and: 和:
static IEnumerable<DictionaryEntry> CastDictionaryEntry(IEnumerable dict)
{
foreach (var item in dict)
{
yield return (DictionaryEntry)item;
}
}
Is there any easier way to do this? 有没有更简单的方法可以做到这一点?
I think works, but then again I haven't tested against a broad set of inputs- 我认为可以,但是我仍然没有针对广泛的输入进行测试-
class ABC
{
public int MyProperty { get; set; }
public int MyProperty2 { get; set; }
}
static List<T> ConfigureMap<T>(Dictionary<int, T> input) where T : class
{
AutoMapper.Mapper.Initialize(cfg => cfg.CreateMap(input.GetType(), typeof(List<T>))
.ConstructUsing(Construct));
return Mapper.Map<List<T>>(input);
}
private static object Construct(object arg1, ResolutionContext arg2)
{
if (arg1 != null)
{
var val = arg1 as IDictionary;
var argument = val.GetType().GetGenericArguments()[1];
if (val != null)
{
var type = Activator.CreateInstance(typeof(List<>).MakeGenericType(argument));
foreach (var key in val.Keys)
{
((IList)type).Add(val[key]);
}
return type;
}
}
return null;
}
var so = new Dictionary<int, ABC> { { 1, new ABC { MyProperty = 10, MyProperty2 = 30 } } };
var dest = new List<ABC>();
var res = ConfigureMap<ABC>(so);
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