PersonGrad

PersonGrad

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“对象引用未设置为对象的实例” SyndicationSerializer中的异常

本文介绍了“对象引用未设置为对象的实例” SyndicationSerializer中的异常的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我们在以下网址上收到此错误（帖子末尾的完全例外）：
$


http：// localhost：2948 / FourWerkService .svc / EreignisSet（6）？$ expand = PersonEreignis / Person / PersonGrad / Grad



一旦我们将Grad展开，它就会起作用：



http：// localhost：2948 / FourWerkService.svc / EreignisSet（6）？$ expand = PersonEreignis / Person / PersonGrad



模型如下：



[Ereignis] 1 --- n [PersonEreignis] n --- 1 [Person] 1 --- n [ PersonGrad] n --- 1 [Grad]



在这种情况下，[Ereignis]只有一个[PersonEreignis]，因此只有一个[Person]，没有[PersonGrad]因此任何[Grad]



这个网址没有问题：



http：/ /localhost:2948/FourWerkService.svc/PersonSet(418）？$ expand = PersonGrad / Grad


它有什么问题？应该在网址中指定其他内容吗？那是一个错误吗？有没有解决方法？


提前致谢


完全例外：


<？xml版本= QUOT; 1.0"编码= QUOT; ISO-8859-1" standalone =" yes"？>

< entry xml：base =" http：// localhost：2948 / FourWerkService.svc /"的xmlns：d =" HTTP：//schemas.microsoft.com/ado/2007/08/dataservices"的xmlns：M =" HTTP：//schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns =" http：//www.w3.org/2005/Atom">

  < id> http：// localhost：2948 / FourWerkService.svc / EreignisSet（6）< / id>

  < title type =" text">< / title>

  < updated> 2010-04-20T08：59：24Z< / updated>

  < author>

    < name />

  < / author>

  < link rel =" edit"标题= QUOT;本生" HREF =" EreignisSet（6）" />

  < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonEreignis"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonEreignis" href =" EreignisSet（6）/ PersonEreignis"> b
    < m：inline>

      < feed>

        < title type =" text"> PersonEreignis< / title>

        < id> http：// localhost：2948 / FourWerkService.svc / EreignisSet（6）/ PersonEreignis< / id>

        < updated> 2010-04-20T08：59：24Z< / updated>

        < link rel =" self"标题= QUOT; PersonEreignis" HREF =" EreignisSet（6）/ PersonEreignis" />
$
        < entry>

          < ID> HTTP：//本地主机：2948 / FourWerkService.svc / PersonEreignisSet（32）< / ID>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ; < title type =" text">< / title>

          < updated> 2010-04-20T08：59：24Z< / updated>

          < author>&
            < name />

          < / author>

          < link rel =" edit"标题= QUOT; PersonEreignis" HREF =" PersonEreignisSet（32）>>; />
$
          < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/Ereignis"类型= QUOT;应用/原子+ xml的;类型=项"标题= QUOT;本生" HREF =" PersonEreignisSet（32）/&本生QUOT;
/>

          < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/Person"类型= QUOT;应用/原子+ xml的;类型=项"标题= QUOT;人" href =" PersonEreignisSet（32）/ Person">

            < m：inline>

              < entry>&
                < ID> HTTP：//本地主机：2948 / FourWerkService.svc / PersonSet（418）< / ID>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; <标题类型= QUOT;文本">< /标题>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; &NBSP;&NBSP; <更新> 2010-04-20T08：59：24Z< /更新>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP; <作者>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < name />&
                < / author>&
                < link rel =" edit"标题= QUOT;人" HREF =" PersonSet（418）" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonEreignis"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonEreignis"
href =" PersonSet（418）/ PersonEreignis" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonAusbildung"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonAusbildung"
href =" PersonSet（418）/ PersonAusbildung" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonAusweiskategorie"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonAusweiskategorie"
href =" PersonSet（418）/ PersonAusweiskategorie" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonFeuerwache"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonFeuerwache"
href =" PersonSet（418）/ PersonFeuerwache" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonFunktion"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonFunktion"
href =" PersonSet（418）/ PersonFunktion" />               < link rel =" http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonGrad"类型= QUOT;应用/原子+ xml的;类型=进料"标题= QUOT; PersonGrad"
HREF =" PersonSet（418）/ PersonGrad">

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP; < M：直列>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; &NBSP; <饲料>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; &NBSP;&NBSP; < title type =" text"> PersonGrad< / title>

              &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < id> http：// localhost：2948 / FourWerkService.svc / PersonSet（418）/ PersonGrad< / id>

         &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; <更新> 2010-04-20T08：59：24Z< /更新>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < link rel =" self"标题= QUOT; PersonGrad" HREF =" PersonSet（418）/ PersonGrad" />

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP; < m：错误>                  &NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < M：码>< / M：码>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < m：message xml：lang =" de-CH">处理此请求时出错。< / m：message>

      &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < innererror的xmlns = QUOT; XMLNS">

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < message>对象引用未设置为对象的实例。< / message>

            &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; <类型> System.NullReferenceException< /类型>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; <堆栈跟踪>&NBSP;&NBSP;在System.Data.Services.Serializers.SyndicationSerializer.WriteOtherElements（字符串
标题，字符串linkRelation，乌里绝对URI，字符串relativeUri，SyndicationItem项）及#xD;

&NBSP;&NBSP;在System.Data.Services.Serializers.SyndicationSerializer.WriteEntryElement（IExpandedResult扩大，对象元素，类型expectedType，乌里绝对URI，字符串relativeUri，SyndicationItem靶）及#xD;

&NBSP;&NBSP;在System.Data.Services.Serializers.SyndicationSerializer。& lt; DeferredFeedItems& gt; d__0.MoveNext（）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItems（XmlWriter writer，IEnumerable`1 items，Uri feedBaseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeedTo（XmlWriter writer，SyndicationFeed feed，Boolean isSourceFeed）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeed（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteTo（XmlWriter writer）& #xD;

  在System.Data.Services.Serializers.SyndicationSerializer.InlineAtomFeed.WriteXml（XmlWriter writer）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable（XmlWriterDelegator的XmlWriter，对象OBJ，XmlSerializableWriter xmlSerializableWriter）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.XmlDataContract.WriteXmlValue（XmlWriterDelegator的XmlWriter，对象OBJ，XmlObjectSerializerWriteContext上下文）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.InternalWriteObject（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.WriteObject（XmlWriter writer，Object graph）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions（XmlWriter writer，String version）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink（XmlWriter writer，SyndicationLink link，Uri baseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents（XmlWriter dictWriter，SyndicationItem item，Uri feedBaseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10ItemFormatter.WriteItem（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.Atom10ItemFormatter.WriteTo（XmlWriter writer）& #xD;

  在System.Data.Services.Serializers.SyndicationSerializer.InlineAtomItem.WriteXml（XmlWriter writer）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable（XmlWriterDelegator的XmlWriter，对象OBJ，XmlSerializableWriter xmlSerializableWriter）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.XmlDataContract.WriteXmlValue（XmlWriterDelegator的XmlWriter，对象OBJ，XmlObjectSerializerWriteContext上下文）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.InternalWriteObject（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.WriteObject（XmlWriter writer，Object graph）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions（XmlWriter writer，String version）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink（XmlWriter writer，SyndicationLink link，Uri baseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents（XmlWriter dictWriter，SyndicationItem item，Uri feedBaseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItem（XmlWriter writer，SyndicationItem item，Uri feedBaseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItems（XmlWriter的作家，IEnumerable`1项目，乌里feedBaseUri）及#xD;

&NBSP;&NBSP;在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeedTo（XmlWriter的作家，SyndicationFeed饲料，布尔isSourceFeed）及#xD;

&NBSP;&NBSP;在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeed（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteTo（XmlWriter writer）& #xD;

  在System.Data.Services.Serializers.SyndicationSerializer.InlineAtomFeed.WriteXml（XmlWriter writer）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable（XmlWriterDelegator的XmlWriter，对象OBJ，XmlSerializableWriter xmlSerializableWriter）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.XmlDataContract.WriteXmlValue（XmlWriterDelegator的XmlWriter，对象OBJ，XmlObjectSerializerWriteContext上下文）及#xD;

&NBSP;&NBSP;在System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.InternalWriteObject（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions（XmlWriterDelegator writer，Object graph）& #xD;

  在System.Runtime.Serialization.DataContractSerializer.WriteObject（XmlWriter writer，Object graph）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions（XmlWriter writer，String version）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink（XmlWriter writer，SyndicationLink link，Uri baseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents（XmlWriter dictWriter，SyndicationItem item，Uri feedBaseUri）& #xD;

  在System.ServiceModel.Syndication.Atom10ItemFormatter.WriteItem（XmlWriter writer）& #xD;

  在System.ServiceModel.Syndication.Atom10ItemFormatter.WriteTo（XmlWriter writer）& #xD;

  在System.Data.Services.Serializers.SyndicationSerializer.WriteTopLevelElement（扩展的IExpandedResult，对象元素）& #xD;

  在System.Data.Services.Serializers.Serializer.WriteRequest（IEnumerator queryResults，Boolean hasMoved）& #xD;

  在System.Data.Services.ResponseBodyWriter.Write（流流）LT /堆栈跟踪>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < / innererror>

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP;&NBSP; < / m：错误>

解决方案


We receive this error (full exception at the end of the post) on the following url:

http://localhost:2948/FourWerkService.svc/EreignisSet(6)?$expand=PersonEreignis/Person/PersonGrad/Grad

As soon as we take the Grad expand away it works:

http://localhost:2948/FourWerkService.svc/EreignisSet(6)?$expand=PersonEreignis/Person/PersonGrad

The model is as follow:

[Ereignis] 1---n [PersonEreignis] n---1 [Person] 1---n [PersonGrad] n---1 [Grad]

In this case the [Ereignis] has only one [PersonEreignis], therefore only one [Person], who has no [PersonGrad] and therefore any [Grad]

This url gives no problem:

http://localhost:2948/FourWerkService.svc/PersonSet(418)?$expand=PersonGrad/Grad

What is wrong with it? Should something else specified in the url? Is that a bug? Is there a work around?

Thanks in advance

Full exception:

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<entry xml:base="http://localhost:2948/FourWerkService.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">
  <id>http://localhost:2948/FourWerkService.svc/EreignisSet(6)</id>
  <title type="text"></title>
  <updated>2010-04-20T08:59:24Z</updated>
  <author>
    <name />
  </author>
  <link rel="edit" title="Ereignis" href="EreignisSet(6)" />
  <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonEreignis" type="application/atom+xml;type=feed" title="PersonEreignis" href="EreignisSet(6)/PersonEreignis">
    <m:inline>
      <feed>
        <title type="text">PersonEreignis</title>
        <id>http://localhost:2948/FourWerkService.svc/EreignisSet(6)/PersonEreignis</id>
        <updated>2010-04-20T08:59:24Z</updated>
        <link rel="self" title="PersonEreignis" href="EreignisSet(6)/PersonEreignis" />
        <entry>
          <id>http://localhost:2948/FourWerkService.svc/PersonEreignisSet(32)</id>
          <title type="text"></title>
          <updated>2010-04-20T08:59:24Z</updated>
          <author>
            <name />
          </author>
          <link rel="edit" title="PersonEreignis" href="PersonEreignisSet(32)" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Ereignis" type="application/atom+xml;type=entry" title="Ereignis" href="PersonEreignisSet(32)/Ereignis" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Person" type="application/atom+xml;type=entry" title="Person" href="PersonEreignisSet(32)/Person">
            <m:inline>
              <entry>
                <id>http://localhost:2948/FourWerkService.svc/PersonSet(418)</id>
                <title type="text"></title>
                <updated>2010-04-20T08:59:24Z</updated>
                <author>
                  <name />
                </author>
                <link rel="edit" title="Person" href="PersonSet(418)" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonEreignis" type="application/atom+xml;type=feed" title="PersonEreignis" href="PersonSet(418)/PersonEreignis" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonAusbildung" type="application/atom+xml;type=feed" title="PersonAusbildung" href="PersonSet(418)/PersonAusbildung" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonAusweiskategorie" type="application/atom+xml;type=feed" title="PersonAusweiskategorie" href="PersonSet(418)/PersonAusweiskategorie" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonFeuerwache" type="application/atom+xml;type=feed" title="PersonFeuerwache" href="PersonSet(418)/PersonFeuerwache" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonFunktion" type="application/atom+xml;type=feed" title="PersonFunktion" href="PersonSet(418)/PersonFunktion" />
                <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/PersonGrad" type="application/atom+xml;type=feed" title="PersonGrad" href="PersonSet(418)/PersonGrad">
                  <m:inline>
                    <feed>
                      <title type="text">PersonGrad</title>
                      <id>http://localhost:2948/FourWerkService.svc/PersonSet(418)/PersonGrad</id>
                      <updated>2010-04-20T08:59:24Z</updated>
                      <link rel="self" title="PersonGrad" href="PersonSet(418)/PersonGrad" />
                      <m:error>
                        <m:code></m:code>
                        <m:message xml:lang="de-CH">An error occurred while processing this request.</m:message>
                        <innererror xmlns="xmlns">
                          <message>Object reference not set to an instance of an object.</message>
                          <type>System.NullReferenceException</type>
                          <stacktrace>   at System.Data.Services.Serializers.SyndicationSerializer.WriteOtherElements(String title, String linkRelation, Uri absoluteUri, String relativeUri, SyndicationItem item)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.WriteEntryElement(IExpandedResult expanded, Object element, Type expectedType, Uri absoluteUri, String relativeUri, SyndicationItem target)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.&lt;DeferredFeedItems&gt;d__0.MoveNext()&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItems(XmlWriter writer, IEnumerable`1 items, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeedTo(XmlWriter writer, SyndicationFeed feed, Boolean isSourceFeed)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeed(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteTo(XmlWriter writer)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.InlineAtomFeed.WriteXml(XmlWriter writer)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable(XmlWriterDelegator xmlWriter, Object obj, XmlSerializableWriter xmlSerializableWriter)&#xD;
   at System.Runtime.Serialization.XmlDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions(XmlWriter writer, String version)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink(XmlWriter writer, SyndicationLink link, Uri baseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents(XmlWriter dictWriter, SyndicationItem item, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10ItemFormatter.WriteItem(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.Atom10ItemFormatter.WriteTo(XmlWriter writer)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.InlineAtomItem.WriteXml(XmlWriter writer)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable(XmlWriterDelegator xmlWriter, Object obj, XmlSerializableWriter xmlSerializableWriter)&#xD;
   at System.Runtime.Serialization.XmlDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions(XmlWriter writer, String version)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink(XmlWriter writer, SyndicationLink link, Uri baseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents(XmlWriter dictWriter, SyndicationItem item, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItem(XmlWriter writer, SyndicationItem item, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItems(XmlWriter writer, IEnumerable`1 items, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeedTo(XmlWriter writer, SyndicationFeed feed, Boolean isSourceFeed)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteFeed(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteTo(XmlWriter writer)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.InlineAtomFeed.WriteXml(XmlWriter writer)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteIXmlSerializable(XmlWriterDelegator xmlWriter, Object obj, XmlSerializableWriter xmlSerializableWriter)&#xD;
   at System.Runtime.Serialization.XmlDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)&#xD;
   at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.ExtensionDataWriter.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtension.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationElementExtensionCollection.WriteTo(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.ExtensibleSyndicationObject.WriteElementExtensions(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.SyndicationLink.WriteElementExtensions(XmlWriter writer, String version)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteLink(XmlWriter writer, SyndicationLink link, Uri baseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10FeedFormatter.WriteItemContents(XmlWriter dictWriter, SyndicationItem item, Uri feedBaseUri)&#xD;
   at System.ServiceModel.Syndication.Atom10ItemFormatter.WriteItem(XmlWriter writer)&#xD;
   at System.ServiceModel.Syndication.Atom10ItemFormatter.WriteTo(XmlWriter writer)&#xD;
   at System.Data.Services.Serializers.SyndicationSerializer.WriteTopLevelElement(IExpandedResult expanded, Object element)&#xD;
   at System.Data.Services.Serializers.Serializer.WriteRequest(IEnumerator queryResults, Boolean hasMoved)&#xD;
   at System.Data.Services.ResponseBodyWriter.Write(Stream stream)</stacktrace>
                        </innererror>
                      </m:error>

解决方案


这篇关于“对象引用未设置为对象的实例” SyndicationSerializer中的异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

09-27 13:27
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