XML Serialization Error In Nhibernate with MVC4 Web API

Question

Hello we are creating a web API in MVC4 with NHibernate. But when we are calling the web API it throws us the Error. Here is the Error.

<Error><Message>An error has occurred.</Message><ExceptionMessage>The 'ObjectContent`1' type failed to serialize the response body for content type 'application/xml; charset=utf-8'.</ExceptionMessage><ExceptionType>System.InvalidOperationException</ExceptionType><StackTrace/><InnerException><Message>An error has occurred.</Message><ExceptionMessage>Type 'NHibernate.Collection.Generic.PersistentGenericSet`1[[MvcAngular.Models.BankAccount, MvcAngular, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' with data contract name 'ArrayOfBankAccount:http://schemas.datacontract.org/2004/07/MvcAngular.Models' 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.</ExceptionMessage><ExceptionType>System.Runtime.Serialization.SerializationException</ExceptionType><StackTrace>   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)
   at WriteCustomerInfoToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )
   at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerializeReference(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)
   at WriteArrayOfCustomerInfoToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )
   at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiTypeAtTopLevel(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle originalDeclaredTypeHandle, Type graphType)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)
   at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)
   at System.Net.Http.Formatting.XmlMediaTypeFormatter.<>c__DisplayClass7.<WriteToStreamAsync>b__6()
   at System.Threading.Tasks.TaskHelpers.RunSynchronously(Action action, CancellationToken token)</StackTrace></InnerException></Error>

We are successfully getting the Result in the WebApi. here is the schema of the Classess. we have Used ISET int the parent class

public class CustomerInfo
    {

        int _CustomerId;
        public virtual int CustomerId
        {
            get { return _CustomerId; }
            set { _CustomerId = value; }
        }

        string _Name;
        [Required]
        public virtual string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }

        public virtual ISet<BankAccount> BankAccounts { get; set; }


        public virtual void SetBankAccount(ISet<BankAccount> bankact)
        {
            this.BankAccounts = bankact;
        }


        public virtual ISet<BankAccount> GetBankAccounts()
        {
            return this.BankAccounts;
        }

    }

AND This is the Get Method of Web API

 public IList<CustomerInfo> Get()
        {
            CustomerInfoDAL cd = new CustomerInfoDAL();
            var lst = cd.GetCustomer();
            return lst;
        }

We are successfully getting the Result in lst. but while showing that through Web api it shows us this Error.

The error is because you are, as noted by the inner exception, trying to serialize an internal NHibernate type that the DataContractSerializer knows nothing about. See http://stackoverflow.com/questions/2551073/how-can-i-transfer-an-nhibernate-persistentgenericset-over-wcf. — Oskar Berggren, Feb 20 '13 at 08:20
Then should we try Bag instead of SET ? and should we try IList rather than ISET — Moiz, Feb 20 '13 at 08:35
Then you will get a PersistentGenericBag instead of a PersistenGenericSet. — Oskar Berggren, Feb 20 '13 at 09:15

score 0 · Answer 1 · answered Feb 20 '13 at 11:18

0

Actually Nhibernate ISET<> is not supported by serialization. we have to fetch that though JSON. ie you can use Fiddler to see the result.

answered Feb 20 '13 at 11:18

Moiz

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XML Serialization Error In Nhibernate with MVC4 Web API

1 Answers1