c# - 如何在泛型集合中转换对象？

Question

我需要将对象转换为通用集合，看:

var currentEntityProperties = currentEntity.GetType().GetProperties();

foreach (var currentEntityProperty in currentEntityProperties)
{
    if (currentEntityProperty.PropertyType.GetInterfaces().Any(
                x => x.IsGenericType &&
                x.GetGenericTypeDefinition() == typeof(ICollection<>)))
    {
        var collectionType = currentEntityProperty.PropertyType.GetInterfaces().Where(
                                x => x.IsGenericType &&
                                x.GetGenericTypeDefinition() == typeof(ICollection<>)).First();

        var argumentType = collectionType.GetGenericArguments()[0];

        // now i need to convert the currentEntityProperty into a collection, something like that (this is wrong, so, what is thr right way?):
        var currentCollection = (ICollection<argumentType.GetType()>)currentEntityProperty.GetValue(currentEntity, null);
    }
}

我该怎么做？

Obs:我需要用这个集合调用另一个集合的 except 方法(我用与 currentCollection 相同的方式获得这个集合，使用 anotherEntityProperty.GetValue(anotherEntity, null))

var itens = currentCollection.Except(anotherCollection);

Answer 1

动态类型让您可以让编译器和 DLR 在这里完成所有工作:

dynamic currentCollection = ...;
dynamic anotherCollection = ...;
dynamic items = Enumerable.Except(currentCollection, anotherCollection);

在执行时，这将为您完成所有反射工作并选择最合适的类型参数。