Spring.net-PropertyRetrievingFactoryObject-属性为null [英] Spring.net - PropertyRetrievingFactoryObject - property is null

问题描述

为了解决这个问题，我正在查看我们的spring.net配置如何工作.

In an attempt to resolve this question, I'm taking a look at how our spring.net configuration works.

根本问题来自此代码段:

The root problem comes from this snippet:

<object name="someObject" singleton="false" type="SomeType.someObject, SomeAssembly">
  <constructor-arg name="authSession">
    <object type="Spring.Objects.Factory.Config.PropertyRetrievingFactoryObject, Spring.Core">
      <property name="TargetObject" ref="AuthSessionManager" />
      <property name="TargetProperty" value="CurrentAuthSession" />
    </object>
  </constructor-arg>
</object>

在用户未登录的情况下，AuthSessionManager.CurrentAuthSession将为空.在这种情况下，Spring.NET会引发异常:工厂对象返回空对象".

In a case where a user is not logged in, AuthSessionManager.CurrentAuthSession will be null. When that is the case, Spring.NET throws an exception: "Factory object returned null object".

如何告诉Spring在这种情况下可以接受空对象?

How can I tell Spring that the null object is acceptable in this case?

推荐答案

您可以使用

表达式被允许计算为null，因此您不必告诉Spring任何东西. 这对我来说很简单(没有嵌套上下文).

Expressions are allowed to evaluate to null, so you don't have to tell Spring anything. This worked for me in a simple case (no nested contexts).

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