当序列化为JSON时,此方法可以正常工作,但我无法使用XML.如果我使用XmlSerializer或DataContractSerializer手动序列化返回的对象,我会得到预期的结果.当WebApi本身试图从HttpRequest序列化它时,我得到如下错误：

System.Runtime.Serialization.SerializationException

Type ‘Priority’ with data contract name
‘Priority:http://schemas.datacontract.org/2004/07/’ is not expected.
Consider using a DataContractResolver or add any types not known
statically to the list of known types – for example,by using the
KnownTypeAttribute attribute or by adding them to the list of known
types passed to DataContractSerializer.

我已经尝试使用GlobalConfiguration.Configuration.Formatters.XmlFormatter.SetSerializer为生成的类型设置序列化程序,我知道它可以设置断点,但它似乎忽略它并抛出相同的异常.枚举将由整数支持,并保证每个条目都有唯一值.这是我用来生成类型并返回它的实例的代码.

public object GetSerializableEnumProxy( Type enumType ) {

    if ( enumType == null ) {
        throw new ArgumentNullException( "enumType" );
    }

    if ( !enumType.IsEnum ) {
        throw new InvalidOperationException();
    }

    AssemblyName assemblyName = new AssemblyName("DataBuilderAssembly");
    AssemblyBuilder assemBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,AssemblyBuilderAccess.Run);
    ModuleBuilder moduleBuilder = assemBuilder.DefineDynamicModule("DataBuilderModule");
    TypeBuilder typeBuilder = moduleBuilder.DefineType( enumType.Name,TypeAttributes.Class | TypeAttributes.Public );

    // Add the [DataContract] attribute to our generated type
    typeBuilder.SetCustomAttribute(
        new CustomAttributeBuilder( typeof(DataContractAttribute).GetConstructor( Type.EmptyTypes ),new object[] {} )
    );

    CustomAttributeBuilder dataMemberAttributeBuilder = new CustomAttributeBuilder(
        typeof(DataMemberAttribute).GetConstructor(Type.EmptyTypes),new object[] {}
    );

    // For each name in the enum,define a corresponding public int field
    // with the [DataMember] attribute
    foreach ( var value in Enum.GetValues(enumType).Cast<int>() ) {
        var name = Enum.GetName( enumType,value );

        var fb = typeBuilder.DefineField( name,typeof(int),FieldAttributes.Public );

        // Add the [DataMember] attribute to the field
        fb.SetCustomAttribute( dataMemberAttributeBuilder );

        // Set the value of our field to be the corresponding value from the Enum
        fb.SetConstant( value );
    }       

    // Return an instance of our generated type
    return Activator.CreateInstance( typeBuilder.CreateType() );
}

Web Api控制器方法：

private static IEnumerable<Type> RetrievableEnums = new Type[] {
    typeof(Priority),typeof(Status)
};

[GET("enum/{enumName}")]
public HttpResponseMessage GetEnumInformation( string enumName ) {

    Type enumType = RetrievableEnums.SingleOrDefault( type =>
        String.Equals( type.Name,enumName,StringComparison.InvariantCultureIgnoreCase));

    if ( enumType == null ) {
        return Request.CreateErrorResponse( HttpStatusCode.NotFound,"The requested enum could not be retrieved" );
    }

    return Request.CreateResponse( HttpStatusCode.OK,GetSerializableEnumProxy(enumType) );
}

有任何想法吗？