c# - Reflection Get List<> from List(来自通用容器类型的容器类型)

Question

我有一个特殊的情况，在其中一个反射器中我可以得到不同类型的容器，我需要重新充气(比如克隆)。这种情况在引入新型容器时开始发生 (ObservableCollection<T>)

在克隆机制中我发现的是这样的:

if (property.PropertyType.FullName.Contains(ReflectorResources.ListName) || property.PropertyType.FullName.Contains("ConcurrentBag"))
{
    var listElementType = property.PropertyType.GenericTypeArguments[0];
    var newList = (property.PropertyType.FullName.Contains(ReflectorResources.IncidentListName))
         ? Activator.CreateInstance(typeof(Definitions.Session.Products.Motor.IncidentList<>).MakeGenericType(listElementType))
         : property.PropertyType.FullName.Contains("ConcurrentBag") ? Activator.CreateInstance(typeof(ConcurrentBag<>).MakeGenericType(listElementType)) : Activator.CreateInstance(typeof(List<>).MakeGenericType(listElementType));    
    var oneItem = Activator.CreateInstance(listElementType);
}

所以我试着重写它:

if (new[] { ".Collections." }.Any(o => property.PropertyType.FullName.Contains(o)))
{
    var listElementType = property.PropertyType.GenericTypeArguments[0];
    var listType = property.PropertyType;
    var constructedListType = listType.MakeGenericType(listElementType);
    var newList = Activator.CreateInstance(constructedListType);
    var oneItem = Activator.CreateInstance(listElementType);
}

然而它在线上爆炸了:var constructedListType = listType.MakeGenericType(listElementType);有错误

System.InvalidOperationException : Method may only be called on a Type for which Type.IsGenericParameter is true.

我的猜测是我需要提取 List<>从 List<Something> 输入...

如何从通用容器类型获取容器类型？

Answer 1

取而代之的是:

var listElementType = property.PropertyType.GenericTypeArguments[0];
var listType = property.PropertyType;
var constructedListType = listType.MakeGenericType(listElementType);

试试这个:

Type listElementType = property.PropertyType.GenericTypeArguments[0];
Type constructedListType;
if (! property.PropertyType.IsGenericTypeDefinition)
    constructedListType = property.PropertyType;
else
{
    // Depending on where your property comes from
    // This should not work in the case the property type is List<T>
    // How listElementType should allow you to instantiate your type ?
    var listType = property.PropertyType.GetGenericTypeDefinition();
    constructedListType = listType.MakeGenericType(listElementType);
}

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我还说你应该看看 GetGenericTypeDefinition() 方法，但在我写完之前已经有了 AakashM 的答案。
那你应该看看他的回答。