是的，我知道非常通用的标题，但我现在要解释。
鉴于下面的类定义，有人可以解释为什么我在调用Serialize（）方法时会遇到此异常。
{“反映类型'FNM.MISMO_3_0.FOREIGN_OBJECT'时出错。”}
{“选择标识符'ItemsElementName'的类型与'Items'的类型不一致。请使用System.Collections.Generic.List`1 [[MISMO_3_0.ItemsChoiceType，MISMO_3_0，Version = 1.0.0.0，Culture =中性，PublicKeyToken = null]]。“}
谢谢你， 斯蒂芬
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.225")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://www.mismo.org/residential/2009/schemas")]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "http://www.mismo.org/residential/2009/schemas", IsNullable = true)]
public partial class FOREIGN_OBJECT
{
private List<object> itemsField;
private List<ItemsChoiceType> itemsElementNameField;
private MISMOresourceLink typeField;
private bool typeFieldSpecified;
private string roleField;
private string titleField;
private string labelField;
private string sequenceNumberField;
private static System.Xml.Serialization.XmlSerializer serializer;
public FOREIGN_OBJECT()
{
this.itemsElementNameField = new List<ItemsChoiceType>();
this.itemsField = new List<object>();
}
[System.Xml.Serialization.XmlElementAttribute("CharacterEncodingSetType", typeof(CharacterEncodingSetEnum), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("CharacterEncodingSetTypeOtherDescription", typeof(MISMOString), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("EXTENSION", typeof(EXTENSION), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("EmbeddedContentXML", typeof(MISMOXML), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("MIMETypeIdentifier", typeof(MISMOIdentifier), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectCreatedDatetime", typeof(MISMODatetime), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectDescription", typeof(MISMOString), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectEncodingType", typeof(ObjectEncodingEnum), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectEncodingTypeOtherDescription", typeof(MISMOString), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectName", typeof(MISMOString), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ObjectURI", typeof(string), DataType = "anyURI", Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("OriginalCreatorDigestValue", typeof(MISMOValue), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("REFERENCE", typeof(REFERENCE), Order = 0)]
[System.Xml.Serialization.XmlChoiceIdentifierAttribute("ItemsElementName")]
public List<object> Items
{
get
{
return this.itemsField;
}
set
{
this.itemsField = value;
}
}
[System.Xml.Serialization.XmlElementAttribute("ItemsElementName", Order = 1)]
[System.Xml.Serialization.XmlIgnoreAttribute()]
public List<ItemsChoiceType> ItemsElementName
{
get
{
return this.itemsElementNameField;
}
set
{
this.itemsElementNameField = value;
}
}
[System.Xml.Serialization.XmlAttributeAttribute(Form = System.Xml.Schema.XmlSchemaForm.Qualified, Namespace = "http://www.w3.org/1999/xlink")]
public MISMOresourceLink type
{
get
{
return this.typeField;
}
set
{
this.typeField = value;
}
}
[System.Xml.Serialization.XmlIgnoreAttribute()]
public bool typeSpecified
{
get
{
return this.typeFieldSpecified;
}
set
{
this.typeFieldSpecified = value;
}
}
[System.Xml.Serialization.XmlAttributeAttribute(Form = System.Xml.Schema.XmlSchemaForm.Qualified, Namespace = "http://www.w3.org/1999/xlink")]
public string role
{
get
{
return this.roleField;
}
set
{
this.roleField = value;
}
}
[System.Xml.Serialization.XmlAttributeAttribute(Form = System.Xml.Schema.XmlSchemaForm.Qualified, Namespace = "http://www.w3.org/1999/xlink")]
public string title
{
get
{
return this.titleField;
}
set
{
this.titleField = value;
}
}
[System.Xml.Serialization.XmlAttributeAttribute(Form = System.Xml.Schema.XmlSchemaForm.Qualified, Namespace = "http://www.w3.org/1999/xlink", DataType = "NMTOKEN")]
public string label
{
get
{
return this.labelField;
}
set
{
this.labelField = value;
}
}
[System.Xml.Serialization.XmlAttributeAttribute(DataType = "integer")]
public string SequenceNumber
{
get
{
return this.sequenceNumberField;
}
set
{
this.sequenceNumberField = value;
}
}
private static System.Xml.Serialization.XmlSerializer Serializer
{
get
{
if ((serializer == null))
{
serializer = new System.Xml.Serialization.XmlSerializer(typeof(FOREIGN_OBJECT));
}
return serializer;
}
}
#region Serialize/Deserialize
/// <summary>
/// Serializes current FOREIGN_OBJECT object into an XML document
/// </summary>
/// <returns>string XML value</returns>
public virtual string Serialize(System.Text.Encoding encoding)
{
System.IO.StreamReader streamReader = null;
System.IO.MemoryStream memoryStream = null;
try
{
memoryStream = new System.IO.MemoryStream();
System.Xml.XmlWriterSettings xmlWriterSettings = new System.Xml.XmlWriterSettings();
xmlWriterSettings.Encoding = encoding;
System.Xml.XmlWriter xmlWriter = XmlWriter.Create(memoryStream, xmlWriterSettings);
Serializer.Serialize(xmlWriter, this);
memoryStream.Seek(0, System.IO.SeekOrigin.Begin);
streamReader = new System.IO.StreamReader(memoryStream);
return streamReader.ReadToEnd();
}
finally
{
if ((streamReader != null))
{
streamReader.Dispose();
}
if ((memoryStream != null))
{
memoryStream.Dispose();
}
}
}
public virtual string Serialize()
{
return Serialize(Encoding.UTF8);
}
/// <summary>
/// Deserializes workflow markup into an FOREIGN_OBJECT object
/// </summary>
/// <param name="xml">string workflow markup to deserialize</param>
/// <param name="obj">Output FOREIGN_OBJECT object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool Deserialize(string xml, out FOREIGN_OBJECT obj, out System.Exception exception)
{
exception = null;
obj = default(FOREIGN_OBJECT);
try
{
obj = Deserialize(xml);
return true;
}
catch (System.Exception ex)
{
exception = ex;
return false;
}
}
public static bool Deserialize(string xml, out FOREIGN_OBJECT obj)
{
System.Exception exception = null;
return Deserialize(xml, out obj, out exception);
}
public static FOREIGN_OBJECT Deserialize(string xml)
{
System.IO.StringReader stringReader = null;
try
{
stringReader = new System.IO.StringReader(xml);
return ((FOREIGN_OBJECT)(Serializer.Deserialize(System.Xml.XmlReader.Create(stringReader))));
}
finally
{
if ((stringReader != null))
{
stringReader.Dispose();
}
}
}
/// <summary>
/// Serializes current FOREIGN_OBJECT object into file
/// </summary>
/// <param name="fileName">full path of outupt xml file</param>
/// <param name="exception">output Exception value if failed</param>
/// <returns>true if can serialize and save into file; otherwise, false</returns>
public virtual bool SaveToFile(string fileName, System.Text.Encoding encoding, out System.Exception exception)
{
exception = null;
try
{
SaveToFile(fileName, encoding);
return true;
}
catch (System.Exception e)
{
exception = e;
return false;
}
}
public virtual bool SaveToFile(string fileName, out System.Exception exception)
{
return SaveToFile(fileName, Encoding.UTF8, out exception);
}
public virtual void SaveToFile(string fileName)
{
SaveToFile(fileName, Encoding.UTF8);
}
public virtual void SaveToFile(string fileName, System.Text.Encoding encoding)
{
System.IO.StreamWriter streamWriter = null;
try
{
string xmlString = Serialize(encoding);
streamWriter = new System.IO.StreamWriter(fileName, false, Encoding.UTF8);
streamWriter.WriteLine(xmlString);
streamWriter.Close();
}
finally
{
if ((streamWriter != null))
{
streamWriter.Dispose();
}
}
}
/// <summary>
/// Deserializes xml markup from file into an FOREIGN_OBJECT object
/// </summary>
/// <param name="fileName">string xml file to load and deserialize</param>
/// <param name="obj">Output FOREIGN_OBJECT object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool LoadFromFile(string fileName, System.Text.Encoding encoding, out FOREIGN_OBJECT obj, out System.Exception exception)
{
exception = null;
obj = default(FOREIGN_OBJECT);
try
{
obj = LoadFromFile(fileName, encoding);
return true;
}
catch (System.Exception ex)
{
exception = ex;
return false;
}
}
public static bool LoadFromFile(string fileName, out FOREIGN_OBJECT obj, out System.Exception exception)
{
return LoadFromFile(fileName, Encoding.UTF8, out obj, out exception);
}
public static bool LoadFromFile(string fileName, out FOREIGN_OBJECT obj)
{
System.Exception exception = null;
return LoadFromFile(fileName, out obj, out exception);
}
public static FOREIGN_OBJECT LoadFromFile(string fileName)
{
return LoadFromFile(fileName, Encoding.UTF8);
}
public static FOREIGN_OBJECT LoadFromFile(string fileName, System.Text.Encoding encoding)
{
System.IO.FileStream file = null;
System.IO.StreamReader sr = null;
try
{
file = new System.IO.FileStream(fileName, FileMode.Open, FileAccess.Read);
sr = new System.IO.StreamReader(file, encoding);
string xmlString = sr.ReadToEnd();
sr.Close();
file.Close();
return Deserialize(xmlString);
}
finally
{
if ((file != null))
{
file.Dispose();
}
if ((sr != null))
{
sr.Dispose();
}
}
}
#endregion
#region Clone method
/// <summary>
/// Create a clone of this FOREIGN_OBJECT object
/// </summary>
public virtual FOREIGN_OBJECT Clone()
{
return ((FOREIGN_OBJECT)(this.MemberwiseClone()));
}
#endregion
}
答案 0 :(得分：8)
只有ChoiceIdentifier是一个数组而不是通用列表，才支持XmlChoiceIdentifierAttribute中的多个元素。
[System.Xml.Serialization.XmlElementAttribute("ItemsElementName", Order = 1)]
[System.Xml.Serialization.XmlIgnoreAttribute()]
public ItemsChoiceType[] ItemsElementName
{
// ...
}
错误令人困惑，因为它假设Items是类似数组（A列表）而您的选择标识符不是数组，您在选择标识符的类型之前错过了数组限定符。但事实并非如此，所以这个建议完全是误导性的。
注意：理论上看代码（来自微软源服务器）项目不需要是数组......实际上，临时序列化类的生成完全爆炸，因为List.Length不是公开（明确实施）