如何避免 MissingPropertyException [英] How to avoid MissingPropertyException

问题描述

如果一个对象没有属性并且我正在访问该属性，我们会得到一个 MissingPropertyException.我可以做一些类似于安全 null (?.) 的事情来防止丢失的属性，这样它就不会抛出异常吗?

If an object does not have a property and I am accessing the property, we get a MissingPropertyException. Can I do something similar to safe null (?.) to guard against missing properties so it doesn't throw an exception?

推荐答案

一种选择是:

def result = obj.hasProperty( 'b' ) ? obj.b : null

如果对象没有属性，哪个将返回 null...

Which would return null if the object doesn't have the property...

另一种方法是将 propertyMissing 添加到您的类中，如下所示:

Another would be to add propertyMissing to your class like so:

def propertyMissing( name ) {
  null
}

这意味着任何缺失的属性都会导致 null.

This means that any missing properties would just result in null.

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