我尝试将ModelStateDictionary序列化为XML字符串。我尝试使用.net XML序列化类，如下所示：
XmlSerializer serializer = new XmlSerializer(typeof(ModelStateDictionary));
TextWriter textWriter = new StreamWriter("c:\\files\\text.xml");
serializer.Serialize(textWriter,this.ModelState);
textWriter.Close();
结果是：
<?xml version="1.0" encoding="utf-8"?>
<ArrayOfKeyValuePairOfStringModelState xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
<KeyValuePairOfStringModelState />
</ArrayOfKeyValuePairOfStringModelState>
所以以不同的方式尝试使用SharpSerializer和这段代码：
SharpSerializer serializer = new SharpSerializer();
serializer.Serialize(ModelState, "c:\\files\\text.xml");
这给了我一个错误：
Unable to cast object of type 'System.Web.Mvc.ModelStateDictionary' to type 'System.Collections.ICollection'.
使用此stacktrace：
[InvalidCastException: Unable to cast object of type 'System.Web.Mvc.ModelStateDictionary' to type 'System.Collections.ICollection'.]
Polenter.Serialization.Serializing.PropertyFactory.parseCollectionItems(CollectionProperty property, TypeInfo info, Object value) +121
Polenter.Serialization.Serializing.PropertyFactory.fillCollectionProperty(CollectionProperty property, TypeInfo info, Object value) +75
Polenter.Serialization.Serializing.PropertyFactory.CreateProperty(String name, Object value) +679
Polenter.Serialization.SharpSerializer.Serialize(Object data, Stream stream) +196
Polenter.Serialization.SharpSerializer.Serialize(Object data, String filename) +111
Getronics.Web.Portal.Controllers.BaseCiController`1.Create(String btnaction, TRecordType dto) in C:\projects\Getronics\Getronics.Web.Portal\Controllers\BaseCiController.cs:58
lambda_method(Closure , ControllerBase , Object[] ) +228
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +208
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +263
System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +263
System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343
System.Web.Mvc.Controller.ExecuteCore() +116
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8963149
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
所以这里没有运气。虽然我真的很想序列化模型状态。有谁知道如何使SharpSerializer与Dictionary对象一起使用？或者可能是一个不同的序列化器？
答案 0 :(得分：0)
以下是如何使用以下Dictionary包装器序列化ModelStateDictionary的片段。
XmlSerializer serializer = new XmlSerializer(typeof(SerializableDictionaryWrapper<string, ModelState>));
TextWriter textWriter = new StreamWriter("c:\\files\\text.xml");
serializer.Serialize(textWriter,new SerializableDictionaryWrapper<string, ModelState>(this.ModelState));
textWriter.Close();
这是一个Dictionary包装类，它将使字典与XmlSerializer兼容。
/// <summary>
/// The XmlSerializer doesn't know how to serialize dictionaries and will refuse
/// to serialize anything that implements IDictionary. This class can be used
/// to temporarily wrap a dictionary for the serialization process.
/// </summary>
[XmlRoot("DICTIONARY")]
public class SerializableDictionaryWrapper<TKey, TValue> : IXmlSerializable
{
#region Data
private IDictionary<TKey, TValue> m_dictionary = null;
#endregion
#region Properties
/// <summary>
/// Gets or sets the wrapped dictionary.
/// </summary>
/// <value>The wrapped dictionary.</value>
public IDictionary<TKey, TValue> WrappedDictionary
{
get { return m_dictionary; }
set { m_dictionary = value; }
}
#endregion
#region Constructors
/// <summary>
///
/// </summary>
public SerializableDictionaryWrapper()
{
}
/// <summary>
///
/// </summary>
/// <param name="dict"></param>
public SerializableDictionaryWrapper(IDictionary<TKey, TValue> dict)
{
m_dictionary = dict;
}
#endregion
#region IXmlSerializable Members
/// <summary>
/// This property is reserved, apply the <see cref="T:System.Xml.Serialization.XmlSchemaProviderAttribute"></see> to the class instead.
/// </summary>
/// <returns>
/// An <see cref="T:System.Xml.Schema.XmlSchema"></see> that describes the XML representation of the object that is produced by the <see cref="M:System.Xml.Serialization.IXmlSerializable.WriteXml(System.Xml.XmlWriter)"></see> method and consumed by the <see cref="M:System.Xml.Serialization.IXmlSerializable.ReadXml(System.Xml.XmlReader)"></see> method.
/// </returns>
public System.Xml.Schema.XmlSchema GetSchema()
{
return null;
}
/// <summary>
/// Generates an object from its XML representation.
/// </summary>
/// <param name="reader">The <see cref="T:System.Xml.XmlReader"></see> stream from which the object is deserialized.</param>
public void ReadXml(System.Xml.XmlReader reader)
{
XmlSerializer key_serializer = new XmlSerializer(typeof(TKey));
XmlSerializer value_serializer = new XmlSerializer(typeof(TValue));
bool was_empty = reader.IsEmptyElement;
m_dictionary = null;
string type_name = reader.GetAttribute("type");
if (type_name != null)
{
Type type = Type.GetType(type_name, false);
if (type != null)
{
m_dictionary = Activator.CreateInstance(type) as IDictionary<TKey, TValue>;
}
}
if (m_dictionary == null)
{
m_dictionary = new Dictionary<TKey, TValue>();
}
reader.Read();
if (was_empty)
{
return;
}
while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
{
reader.ReadStartElement("item");
reader.ReadStartElement("key");
TKey key = (TKey)key_serializer.Deserialize(reader);
reader.ReadEndElement();
reader.ReadStartElement("value");
TValue value = (TValue)value_serializer.Deserialize(reader);
reader.ReadEndElement();
m_dictionary.Add(key, value);
reader.ReadEndElement();
reader.MoveToContent();
}
reader.ReadEndElement();
}
/// <summary>
/// Converts an object into its XML representation.
/// </summary>
/// <param name="writer">The <see cref="T:System.Xml.XmlWriter"></see> stream to which the object is serialized.</param>
public void WriteXml(System.Xml.XmlWriter writer)
{
XmlSerializer key_serializer = new XmlSerializer(typeof(TKey));
XmlSerializer value_serializer = new XmlSerializer(typeof(TValue));
writer.WriteAttributeString("type", m_dictionary.GetType().AssemblyQualifiedName);
foreach (TKey key in m_dictionary.Keys)
{
writer.WriteStartElement("item");
writer.WriteStartElement("key");
key_serializer.Serialize(writer, key);
writer.WriteEndElement();
writer.WriteStartElement("value");
TValue value = m_dictionary[key];
value_serializer.Serialize(writer, value);
writer.WriteEndElement();
writer.WriteEndElement();
}
}
#endregion
};