XmlSerializer的.跳过xml未知节点

Question

我的xml文件反序列化有问题.让我们假设我们有一个xml文件和一个我们用于反序列化的类.

例如:

xml -

<dataStore>
  <name>newDataStore1</name>
  <description>sdffasdfasdf</description>
  <type>Shapefile</type>
  <enabled>false</enabled>
  <workspace>
    <name>newTestWorkspace</name>
    <atom:link xmlns:atom="http://www.w3.org/2005/Atom" rel="alternate" href="ht
tp://192.168.6.71:8080/geoserver/rest/workspaces/newTestWorkspace.xml" type="app
lication/xml"/>
  </workspace>
  <connectionParameters>
    <entry key="memory mapped buffer">false</entry>
    <entry key="create spatial index">true</entry>
    <entry key="charset">ISO-8859-1</entry>
    <entry key="filetype">shapefile</entry>
    <entry key="cache and reuse memory maps">true</entry>
    <entry key="url">file:data/shapefiles/states.shp</entry>
    <entry key="namespace">http://www.opengeospatial.net/cite</entry>
  </connectionParameters>
  <__default>false</__default>
  <featureTypes>
    <atom:link xmlns:atom="http://www.w3.org/2005/Atom" rel="alternate" href="ht
tp://192.168.6.71:8080/geoserver/rest/workspaces/newTestWorkspace/datastores/new
DataStore1/featuretypes.xml" type="application/xml"/>
  </featureTypes>
</dataStore>

类

namespace GeoServerApiTester
{


    /// <remarks/>
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.225")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlRootAttribute("dataStore", Namespace="", IsNullable=false)]
    public partial class DataStore
    {

        private string nameField;

        private string typeField;

        private bool enabledField;

        private WorkSpacePreview workspaceField;

        private ConnectionParametersStorageEntryCollection connectionParametersField;

        private string @__defaultField;

        private LinkCollection featureTypesField;

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified, Order=0, ElementName="name")]
        public string Name
        {
            get
            {
                return this.nameField;
            }
            set
            {
                this.nameField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified, Order=1, ElementName="type")]
        public string Type
        {
            get
            {
                return this.typeField;
            }
            set
            {
                this.typeField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified, Order=2, ElementName="enabled")]
        public bool Enabled
        {
            get
            {
                return this.enabledField;
            }
            set
            {
                this.enabledField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute(Order=3, ElementName="workspace")]
        public WorkSpacePreview Workspace
        {
            get
            {
                return this.workspaceField;
            }
            set
            {
                this.workspaceField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlArrayAttribute(Order=4, ElementName="connectionParameters")]
        [System.Xml.Serialization.XmlArrayItemAttribute("entry", Form=System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable=false)]
        public ConnectionParametersStorageEntryCollection ConnectionParameters
        {
            get
            {
                return this.connectionParametersField;
            }
            set
            {
                this.connectionParametersField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified, Order=5)]
        public string @__default
        {
            get
            {
                return this.@__defaultField;
            }
            set
            {
                this.@__defaultField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlArrayAttribute(Order=6, ElementName="featureTypes")]
        [System.Xml.Serialization.XmlArrayItemAttribute("link", Namespace="http://www.w3.org/2005/Atom", IsNullable=false)]
        public LinkCollection FeatureTypes
        {
            get
            {
                return this.featureTypesField;
            }
            set
            {
                this.featureTypesField = value;
            }
        }

        public virtual bool ShouldSerializeConnectionParameters()
        {
            return ((this.ConnectionParameters != null) 
                        && (this.ConnectionParameters.Count > 0));
        }

        public virtual bool ShouldSerializeFeatureTypes()
        {
            return ((this.FeatureTypes != null) 
                        && (this.FeatureTypes.Count > 0));
        }
    }
}

您可以看到该类不包含description字段.

<dataStore>
  <name>newDataStore1</name>
  <enabled>false</enabled>
</dataStore>

您可以看到描述后的所有元素都没有反序列化.

当程序获取xml内容并且此xml包含一个不在该类中的元素时,此元素之后的所有元素都不会被预期化.

如何在反序列化期间跳过未知元素并获得如下内容:

<dataStore>
  <name>newDataStore1</name>

  <type>Shapefile</type>
  <enabled>false</enabled>
  <workspace>
    <name>newTestWorkspace</name>
    <atom:link xmlns:atom="http://www.w3.org/2005/Atom" rel="alternate" href="ht
tp://192.168.6.71:8080/geoserver/rest/workspaces/newTestWorkspace.xml" type="app
lication/xml"/>
  </workspace>
  <connectionParameters>
    <entry key="memory mapped buffer">false</entry>
    <entry key="create spatial index">true</entry>
    <entry key="charset">ISO-8859-1</entry>
    <entry key="filetype">shapefile</entry>
    <entry key="cache and reuse memory maps">true</entry>
    <entry key="url">file:data/shapefiles/states.shp</entry>
    <entry key="namespace">http://www.opengeospatial.net/cite</entry>
  </connectionParameters>
  <__default>false</__default>
  <featureTypes>
    <atom:link xmlns:atom="http://www.w3.org/2005/Atom" rel="alternate" href="ht
tp://192.168.6.71:8080/geoserver/rest/workspaces/newTestWorkspace/datastores/new
DataStore1/featuretypes.xml" type="application/xml"/>
  </featureTypes>
</dataStore>

仅删除元素

Answer 1

默认情况下,XmlSerializer会忽略未知节点(因此也会忽略这些元素).现在,当您使用Order属性时,您明确告知要序列化/反序列化的顺序.

因此,当XmlSerializer到达您的description元素时,这将成为一个未知元素,因为它需要该type元素.其余的也将作为未知元素进行威胁,因为它们不再映射到您指定的顺序.例如,当涉及到你type的XML中具有索引2的enabled元素时,它期望它是元素,因此该元素也变得未知.

您可以通过处理XmlSerializer类的UnknownNode事件来检查此行为.将针对遇到的每个未知节点触发此事件.

如何进行？如果排序没有意义,请不要使用它.在某些情况下,使用排序确实有意义.我多次见过的一个经典例子是(遗留)应用程序,它将XML文档视为字符串并从上到下读取所有元素.

另一种选择是实现IXmlSerializer接口,它可以更好地控制对象的序列化和反序列化方式.