从WCF服务返回的XML中缺少收集项值
问题描述:
我有一个简单的WCF服务,它有一个返回“复杂”对象(由简单和集合属性组成)的方法。当我调用此方法并查看生成的XML时,集合中的项目缺失值;但是,如果我在调试器中检查.net对象,则集合及其值会正确填充。从WCF服务返回的XML中缺少收集项值
含有收集的类:
[DataContract]
public class MetadataResponse
{
[DataMember]
public int index;
[DataMember]
public int count;
[DataMember]
public int total;
[DataMember]
public MediaCollection[] mediaCollection;
[DataMember]
public MediaMetadata[] mediaMetadata;
}
所包含的项目类:
[DataContract]
public class MediaCollection
{
public String id;
public String title;
public Enum itemType;
public String artistId;
public String artist;
public String albumArtURI;
public Boolean canPlay;
public Boolean canEnumerate;
public Boolean canAddToFavorites;
public Boolean canScroll;
public Boolean canSkip;
}
一个返回对象的方法:
public MetadataResponse getMetadata(string id, int index, int count, bool recursive)
{
MetadataResponse metadataResponse = new MetadataResponse();
MediaCollection mediaCollectionItem = new MediaCollection();
// return a static collection for now
metadataResponse.index = 0;
metadataResponse.count = 3;
metadataResponse.total = 3;
metadataResponse.mediaCollection = new MediaCollection[3];
// add some items
mediaCollectionItem.id = "0001";
mediaCollectionItem.title = "foo";
metadataResponse.mediaCollection[0] = mediaCollectionItem;
mediaCollectionItem.id = "0002";
mediaCollectionItem.title = "bar";
metadataResponse.mediaCollection[1] = mediaCollectionItem;
mediaCollectionItem.id = "0003";
mediaCollectionItem.title = "choo";
metadataResponse.mediaCollection[2] = mediaCollectionItem;
return metadataResponse;
}
调试结果检查所填充的对象:
{MurfieSoapApi.MetadataResponse}
count: 3
index: 0
mediaCollection: {MurfieSoapApi.MediaCollection[3]}
mediaMetadata: null
total: 3
从方法调用XML结果(仍在试图弄清楚如何获得*的格式化这个...):
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header />
<s:Body>
<getMetadataResponse xmlns="http://www.sonos.com/Services/1.1">
<getMetadataResult xmlns:a="http://schemas.datacontract.org/2004/07/MurfieSoapApi" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:count>3</a:count>
<a:index>0</a:index>
<a:mediaCollection>
<a:MediaCollection />
<a:MediaCollection />
<a:MediaCollection />
</a:mediaCollection>
<a:mediaMetadata i:nil="true" />
<a:total>3</a:total>
</getMetadataResult>
</getMetadataResponse>
</s:Body>
</s:Envelope>
我已经试过,而不是其他的阵列集合类型(列表,等等),但结果总是相同的。我使用默认的web.config值,对于其他返回简单结果的方法运行良好,但是当涉及到这种返回类型时,自动映射器可能无法胜任任务...不确定。
答
因为你缺少从MediaCollection类
数据成员
属性。
取而代之的是:
[DataContract]
public class MediaCollection
{
public String id;
public String title;
public Enum itemType;
public String artistId;
public String artist;
public String albumArtURI;
public Boolean canPlay;
public Boolean canEnumerate;
public Boolean canAddToFavorites;
public Boolean canScroll;
public Boolean canSkip;
}
你应该这样写:
[DataContract]
public class MediaCollection
{
[DataMember]
public String id;
[DataMember]
public String title;
....
}
答
的MediaCollection字段不被序列化。您需要将[DataMember]属性添加到您的字段。
[DataContract]
public class MediaCollection
{
[DataMember]
public String id;
[DataMember]
public String title;
[DataMember]
public Enum itemType;
[DataMember]
public String artistId;
...etc...
}
哇,我怎么错过了?但是,当我补充说,我不能用WCF测试客户端(它在该方法上放置一个红色的x)来测试它;这是可以预料的吗? – jasongullickson 2012-04-11 14:33:29
这可能是因为MediaCollection中的枚举值。请阅读更多信息:http://msdn.microsoft.com/en-us/library/aa347875.aspx – 2012-04-11 14:59:51