比较两个对象的属性 [英] Comparing the properties of two objects

问题描述

我有两个相同类的对象：

I have two objects of the same class:

Car oldCar = new Car()
{
   Engine = "V6",
   Wheels = 4
}
Car newCar = new Car()
{
   Engine = "V8"
   Wheels = 4
}

我想比较两个 Car 对象，并且如果不同（如示例中所示），则打印旧值和更新后的值，如下所示：

I want to compare the properties of the two Car objects, and if different (like in the example), print the old and updated values, like this:

Engine: V6 -> V8

当我添加更多内容时，我目前的操作方式确实很不方便Car类的属性：

The way I'm doing this at the moment is going to be really inconvenient as I add more properties to the Car class:

if(oldCar.Engine != newCar.Engine)
   Console.WriteLine(oldCar.Engine + " -> " + newCar.Engine);

我该如何以更简单的方式完成此任务？我不想手动比较每个属性。

How can I accomplish this in a simpler way? I don't want to manually compare every single property.

推荐答案

为此，您可以使用反射。您可以获得对象的所有属性，并对其进行迭代。像这样的东西：

To achieve that you can use reflection. You can obtain all the properties of the object, and iterate over it. Something like that:

void CompareCars(Car oldCar, Car newCar) 
{
    Type type = oldCar.GetType();
    PropertyInfo[] properties = type.GetProperties();

    foreach (PropertyInfo property in properties)
    {
        object oldCarValue = property.GetValue(oldCar, null); 
        object newCarValue = property.GetValue(newCar, null); 
        Console.WriteLine("oldCar." + property.Name +": " + oldCarValue.toString() " -> "  + "newCar." + property.Name +": " newCarValue.toString();
    }
}

我假设您用作属性的对象包含一个定义toString（）。

I assume the objects that you use as properties contains a definition of toString().

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