C# OData扩展空

使用OData时，如果正在扩展的属性之一为null，则会出现此错误。有没有办法解决这个问题？我期望扩展属性的输出为null，而不是抛出任何异常

<m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<m:code/>
<m:message xml:lang="en-US">An error has occurred.</m:message>
<m:innererror>
    <m:message>
         The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'.
    </m:message>
    <m:type>System.InvalidOperationException</m:type>
    <m:stacktrace/>
    <m:internalexception>
        <m:message>
             The EDM instance of type '[Spawtz.OData.Models.Division Nullable=True]' is missing the property 'Id'.
        </m:message>
        <m:type>System.InvalidOperationException</m:type>
        <m:stacktrace>
        at System.Web.Http.OData.EntityInstanceContext.GetPropertyValue(String        propertyName)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructuralPro perty(IEdmStructuralProperty structuralProperty, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructuralPropertyBag(IEnumerable`1 structuralProperties, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateEntry(SelectExpandNode selectExpandNode, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty(KeyValuePair`2 navigationPropertyToExpand, EntityInstanceContext  entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties(IDictionary`2 navigationPropertiesToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty(KeyValuePair`2 navigationPropertyToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties(IDictionary`2 navigationPropertiesToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)
        at System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)
       --- End of stack trace from previous location where exception was thrown ---
        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        at System.Web.Http.WebHost.HttpControllerHandler.&lt;WriteBufferedResponseContentAsync&gt;d__1b.MoveNext()
        </m:stacktrace>
    </m:internalexception>
</m:innererror>

发生了一个错误。
'ObjectContent'1'类型未能序列化'application/json'内容类型的响应正文；字符集=utf-8'。
System.InvalidOperationException异常
类型为“[Spawtz.OData.Models.Division Nullable=True]”的EDM实例缺少属性“Id”。
System.InvalidOperationException异常
位于System.Web.Http.OData.EntityInstanceContext.GetPropertyValue（字符串propertyName）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructurePro属性（IEdmStructuralProperty StructureProperty，EntityInstanceContext EntityInstanceContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructurePropertyBag（IEnumerable`1 structuralProperties，EntityInstanceContext EntityInstanceContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateEntry（选择ExpandNode选择ExpandNode，EntityInstanceContext EntityInstanceContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry（对象图、ODataWriter writer、ODataSerializerContext writeContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty（KeyValuePair`2 navigationPropertyToExpand，EntityInstanceContext EntityInstanceContext，ODataWriter writer）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties（IDictionary`2 navigationPropertiesToExpand，EntityInstanceContext EntityInstanceContext，ODataWriter-writer）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry（对象图、ODataWriter writer、ODataSerializerContext writeContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed（IEnumerable enumerable，IEdmTypeReference feedType，ODataWriter writer，ODataSerializerContext writeContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty（KeyValuePair`2 navigationPropertyToExpand，EntityInstanceContext EntityInstanceContext，ODataWriter writer）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties（IDictionary`2 navigationPropertiesToExpand，EntityInstanceContext EntityInstanceContext，ODataWriter-writer）
位于System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry（对象图、ODataWriter writer、ODataSerializerContext writeContext）
位于System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed（IEnumerable enumerable，IEdmTypeReference feedType，ODataWriter writer，ODataSerializerContext writeContext）
位于System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStream（类型类型、对象值、流writeStream、HttpContent内容、HttpContentHeaders）
位于System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync（类型类型、对象值、流writeStream、HttpContent内容、TransportContext TransportContext、CancellationToken CancellationToken）
---来自引发异常的上一个位置的堆栈结束跟踪---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
在System.Runtime.CompilerServices.TaskWaiter.HandleNonSuccessAndDebuggerNotification（任务任务）中
在System.Web.Http.WebHost.HttpControllerHandler.WriteBufferedResponseContentSyncd\uu 1b.MoveNext（）中

---

这似乎是webapi.odata中的一个bug：

但我认为当前的行为是跳过null扩展属性，而不是抛出异常

<m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<m:code/>
<m:message xml:lang="en-US">An error has occurred.</m:message>
<m:innererror>
    <m:message>
         The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'.
    </m:message>
    <m:type>System.InvalidOperationException</m:type>
    <m:stacktrace/>
    <m:internalexception>
        <m:message>
             The EDM instance of type '[Spawtz.OData.Models.Division Nullable=True]' is missing the property 'Id'.
        </m:message>
        <m:type>System.InvalidOperationException</m:type>
        <m:stacktrace>
        at System.Web.Http.OData.EntityInstanceContext.GetPropertyValue(String        propertyName)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructuralPro perty(IEdmStructuralProperty structuralProperty, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateStructuralPropertyBag(IEnumerable`1 structuralProperties, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.CreateEntry(SelectExpandNode selectExpandNode, EntityInstanceContext entityInstanceContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty(KeyValuePair`2 navigationPropertyToExpand, EntityInstanceContext  entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties(IDictionary`2 navigationPropertiesToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperty(KeyValuePair`2 navigationPropertyToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteExpandedNavigationProperties(IDictionary`2 navigationPropertiesToExpand, EntityInstanceContext entityInstanceContext, ODataWriter writer)
        at System.Web.Http.OData.Formatter.Serialization.ODataEntityTypeSerializer.WriteEntry(Object graph, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)
        at System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)
        at System.Web.Http.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)
       --- End of stack trace from previous location where exception was thrown ---
        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        at System.Web.Http.WebHost.HttpControllerHandler.&lt;WriteBufferedResponseContentAsync&gt;d__1b.MoveNext()
        </m:stacktrace>
    </m:internalexception>
</m:innererror>

---

您可以尝试将引用更新到最新版本吗？

我已修复此错误，并已提交拉取请求，他们说它将在下一版本中修复