检查注入的参数中的空值是否有意义？ [英] Does it make sense to check for null values in injected arguments?

问题描述

我在我的应用程序中使用Unity。在构造函数中检查注入值是否为空值？

I am using Unity in my application. Does it make sense to check for null values in the constructor for the injected values?

public class ExampleClass
{
    public ExampleClass(IExampleArgument e)
    {
        if (e == null)
            //Do something
    }
}

参数是否应该已经解析并绑定到值上？而且如果发生问题，它应该在解决过程中发生，所以我在这里有值还是没有？

Shouldn't the argument be resolved already and bound to a value? And in case a problem happens, it should occur during resolving, so I either have a value here or I don't?

推荐答案

在构造函数中检查注入值是否为空值有意义吗？

Does it make sense to check for null values in the constructor for the injected values?

绝对。

该参数是否应该已经解析并绑定到值上？

Shouldn't the argument be resolved already and bound to a value?

没有任何强制客户使用注入的方法-语法上以 null 值调用构造函数是完全有效的。我假设 null 值会在程序的后面引起问题，所以您决定-是否要在该构造函数中处理该问题，或者让它稍后自然发生在程序中？

There's nothing forcing clients to use injection - it would be perfectly valid syntactically to call your constructor with a null value. I'm assuming that a null value would cause a problem later in the program, so you decide - do you want to handle the problem in that constructor or let it occur naturally later in the program?

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