微软的ASP.NET Web API的OData4.0.30506包不具备$选择和$扩展的支持。要得到$选择和$扩展的支持，你必须升级到我们最新的软件包之一。 5.0.0-β2应该工作。或者，您可以尝试我们的每晚构建以及获得所有最新功能。

'Microsoft ASP.NET Web API OData' 4.0.30506 package doesn't have the $select and $expand support. To get $select and $expand support, you have to upgrade to one of our latest packages. 5.0.0-beta2 should work. Optionally, you can try our nightly builds as well to get all the latest features.