尝试使用反射查找不为空的对象中的所有集合 [英] Trying to find all collections in an object not null with reflection

问题描述

我正在尝试构建一个通用的单元测试方法，以确保我们所有的对象都在初始化它们作为构造函数集合的属性.我没有手动检查每个属性的断言，然后考虑是否修改了类对象，我想使用反射.问题在于集合，并不仅仅是List，而是类的类副本，然后继承List.

I am trying to build a generic unit test method, to make sure all of our objects are initiliazing their properties that are collections on the constructor. I instead of manually checking with assert on each property, and then thinking ahaed if a class object is modified, I wanted to use reflection. The problem is that the collections, and not just List, but a class copy of the class, and then inherit List.

所以，我们可能有如下内容:

So, we may have somthing like the following:

public class PaymentType
{
   int Id{get;set;}
   PaymentTypeCollection PaymentTypeCollection {get;set;}

}

public class PaymentTypeCollection : List<PaymentType>
{
   //som ecustom stuff here

}

现在的问题是，当您从 PaymentType 类中迭代对象的属性，并尝试使用以下检查执行反射方法时，它返回 false，并且可以理解.

Now the problem is that when you itterate over the properties of the object from class PaymentType, and try to do a reflection method with the following check, it comes back false, and understandably.

foreach (var prop in objectType.GetProperties())
        {
            // test if property is IEnumerable<T>? This comes back as false
            if (typeof(IEnumerable<>).IsAssignableFrom(prop.PropertyType))
            {
               //do stuff here
            }
        }

我该如何解决这个问题.我需要查看该属性是否继承了 IEnumerable?因为类型实际上是 PaymentTypeColelction.我将如何处理?

How could I go about the issue. I need to see if the property, is then inheriting IEnumerable? Since the type would actually be PaymentTypeColelction. How would I handle that?

提前致谢.

推荐答案

使用非通用的 IEnumerable.泛型的IEnumerable实现了IEnumerable，不用担心类型参数.

Use the non-generic IEnumerable. The generic IEnumerable<out T> implements IEnumerable, and you don't have to worry about type arguments.

if (typeof(IEnumerable).IsAssignableFrom(prop.PropertyType))
{
    //do stuff here
}

但是要小心，例如string也实现了IEnumerable，所以你的方法也会找到string属性.

But be careful, for example string also implements IEnumerable<char>, so your method will also find string properties.

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