C# 通过反射获取 List<T> 中包含的类型？
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Get contained type in a List<T> through reflection?
提问by joshua.ewer
Through reflection, is there some way for me to look at a generic List's contained type to see what type the collection is of? For example:
通过反射，是否有某种方法可以让我查看泛型 List 的包含类型以查看集合的类型？例如：
I have a simple set of business objects that derive from an interface, like this:
我有一组从接口派生的简单业务对象，如下所示：
public interface IEntityBase{}
public class BusinessEntity : IEntityBase
{
public IList<string> SomeStrings {get; set;}
public IList<ChildBusinessEntity> ChildEntities { get; set;}
}
public class ChildBusinessEntity : IEntityBase{}
In the case where I am iterating through the properties of BusinessEntity through reflection, would there be a way for me to see if the objects nested inside those lists derived from IEntityBase?
在我通过反射遍历 BusinessEntity 属性的情况下，有没有办法让我查看嵌套在这些列表中的对象是否从 IEntityBase 派生？
Pseudocoded (badly) like this:
伪编码（严重）是这样的：
foreach(PropertyInfo info in typeof(BusinessEntity).GetProperties())
{
if(info.PropertyType is GenericIList &&
TheNestedTypeInThisList.IsAssignableFrom(IEntityBase)
{
return true;
}
}
Only option I've heard so far, that works, would be to pull out the first item from that list, then look at its type. Any easier way (especially because I can't be guaranteed that the List won't be empty)?
到目前为止，我听到的唯一可行的方法是从该列表中取出第一项，然后查看其类型。任何更简单的方法（特别是因为我不能保证 List 不会为空）？
采纳答案by ChrisW
Assuming you have the System.Typewhich describes your List<>, you can use the Type.GetGenericArguments()method to get the Typeinstance which describes what it's a list of.
假设你有System.Type描述你的List<>，你可以使用该Type.GetGenericArguments()方法来获取Type描述它是什么列表的实例。
回答by Avram
something like this?
像这样的东西？
foreach (System.Reflection.PropertyInfo info
in typeof(BusinessEntity).GetProperties())
{
if (info.PropertyType.IsGenericType &&
info.PropertyType.Name.StartsWith("IList") &&
info.PropertyType.GetGenericArguments().Length > 0 &&
info.PropertyType.GetGenericArguments()[0] == typeof(string)
)
{
return true;
}
}
