在任何类中，您都不能将其值设置为null.不允许，也没有意义-

From any class you can't set its value to null. This is not allowed and doesn't make sense also -

public void Delete()
{
    this = null; <-- NOT ALLOWED
}

您需要一个类的实例来调用Delete()方法，所以一旦完成该操作，为什么不将该实例设置为null呢?

You need an instance of class to call Delete() method so why not set that instance to null itself once you are done with it.

Car car = new Car();
// Use car objects and once done set back to null
car = null;

在C#中，无论如何您都无法实现.我猜测 从您的问题中得出您想要的原因，因为存在内存泄漏 当前设计中存在的问题，该问题不允许Car实例 走开.我建议您更好地描述您的应用程序， 确定阻止GC收集汽车实例的区域，并 致力于改善这一领域.

Anyhow what you are trying to achieve is not possible in C#. I suspect from your question that you want this because there are memory leaks present in your current design which doesn't let the Car instance to go away. I would suggest you better profile your application and identify the areas which is stopping GC to collect car instance and work on improving that area.