有没有一种方法可以拦截C#中的setter和getter? [英] Is there a way to intercept setters and getters in C#?

问题描述

在Ruby和PHP中(我猜也可能是其他语言)，只要设置了属性，就会调用一些实用程序方法. (对于Ruby为 * instance_variable_set * ，对于PHP为 * __ set * ).

所以，假设我有一个像这样的C#类:

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

现在，假设如果调用了Person类中的任何属性设置器，我想先调用另一个方法，然后继续使用该设置器的默认行为，这同样适用于属性设置器. /p>

这可能吗?

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我想在不定义背景字段的情况下执行此操作.

解决方案

一般而言；几个选项；

• 继承自 ContextBoundObject -它是做的允许这样做，但会降低性能
• 编写一个显式属性(即具有后备字段)，然后手动添加实用程序方法调用
• 查看编译时织工，例如 PostSharp -通常是通过发现属性或类似属性
• 看看一些DI/IoC工具(和一些其他基于"decorator"的工具)提供的运行时代码生成器-它们可以修饰或子类化您的对象以添加额外的代码

In both Ruby and PHP (and I guess other languages as well) there are some utility methods that are called whenever a property is set. ( *instance_variable_set* for Ruby, *__set* for PHP).

So, let's say I have a C# class like this:

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

Now, let's say that if any property setter from the Person class is called, I want to call another method first, and then continue with the default behaviour of the setter, and the same applies for the property setters.

Is this possible?

---

Edit: I want to do this without defining a backing field.

解决方案

Not generally; a few options though;

• inherit from ContextBoundObject - which does allow this, but at a performance cost
• write an explicit property (i.e. with a backing field), and add a utility method call manually
• look at compile-time weavers, such as PostSharp - generally by spotting an attribute or similar
• look at runtime code generators, as offered by some DI/IoC tools (and some other "decorator" based tools) - which either decorate or subclass your object to add the extra code

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