使用反射嵌套的完全限定属性名称 [英] Nested fully qualified property name using reflection

问题描述

我有以下课程:

public class Car
{
    public Engine Engine { get; set; }    
    public int Year { get; set; }        
}

public class Engine 
{
    public int HorsePower { get; set; }
    public int Torque { get; set; } 
}

我正在使用以下方法获取所有嵌套的属性:

I'm getting all the nested properties using this:

var result = typeof(Car).GetProperties(BindingFlags.Public | BindingFlags.Instance).SelectMany(GetProperties).ToList();

        private static IEnumerable<PropertyInfo> GetProperties(PropertyInfo propertyInfo)
        {
            if (propertyInfo.PropertyType.IsClass)
            {
                return propertyInfo.PropertyType.GetProperties().SelectMany(prop => GetProperties(prop)).ToList();
            }

            return new [] { propertyInfo };
        }

这给了我该类的所有属性.但是，当我尝试从对象中获取嵌套属性时，会出现异常:

This gives me all the properties of the class. However, when I try and get a nested property from an object, I get an exception:

horsePowerProperty.GetValue(myCar); // object doesn't match target type exception

之所以发生这种情况，是因为它在 Car 对象上找不到属性 HorsePower .我查看了 PropertyInfo 上的所有属性，似乎找不到任何具有完全限定属性名称的地方.然后，我将使用它来拆分字符串，并从 Car 对象中递归获取属性.

This happens because it can't find the property HorsePower on the Car object. I have looked at all of the properties on PropertyInfo and can't seem to find anywhere that has the fully qualified property name. I would then use this to split strings, and recursively get the properties from the Car object.

任何帮助将不胜感激.

推荐答案

(尚未测试)

您可以使用MemberInfo.DeclaringType :

private static object GetPropertyValue(PropertyInfo property, object instance)
{
    Type root = instance.GetType();
    if (property.DeclaringType == root)
        return property.GetValue(instance);
    object subInstance = root.GetProperty(property.DeclaringType.Name).GetValue(instance);
    return GetPropertyValue(property, subInstance);
}

这要求如果 HorsePower 属于 Engine 类型，则需要在 Car 中具有一个名为 Engine 的属性.代码>类型.

This requires that if HorsePower belongs to type Engine, you need to have a property called Engine in your Car type.

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