C# – XML serialization problem in C# ASP.NET

asp.netc

i keep getting this error:

Exception Details:
System.NotSupportedException: Cannot
serialize member
HannaPrintsDataAccess.Customer.CustomerAddresses
of type
System.Collections.Generic.IList`1[[HannaPrintsDataAccess.CustomerAddress,
HannaPrintsDataAccess,
Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]] because it is an
interface.

Here is the stack trace: [NotSupportedException: Cannot
serialize member
HannaPrintsDataAccess.Customer.CustomerAddresses
of type
System.Collections.Generic.IList`1[[HannaPrintsDataAccess.CustomerAddress,
HannaPrintsDataAccess,
Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]] because it is an
interface.]

[InvalidOperationException: Cannot
serialize member
'HannaPrintsDataAccess.Customer.CustomerAddresses'
of type
'System.Collections.Generic.IList`1[[HannaPrintsDataAccess.CustomerAddress,
HannaPrintsDataAccess,
Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]', see inner
exception for more details.]
System.Xml.Serialization.StructModel.CheckSupportedMember(TypeDesc
typeDesc, MemberInfo member, Type
type) +889917
System.Xml.Serialization.StructModel.GetPropertyModel(PropertyInfo
propertyInfo) +132
System.Xml.Serialization.StructModel.GetFieldModel(MemberInfo
memberInfo) +129
System.Xml.Serialization.XmlReflectionImporter.InitializeStructMembers(StructMapping
mapping, StructModel model, Boolean
openModel, String typeName,
RecursionLimiter limiter) +1226
System.Xml.Serialization.XmlReflectionImporter.ImportStructLikeMapping(StructModel
model, String ns, Boolean openModel,
XmlAttributes a, RecursionLimiter
limiter) +460
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1415

[InvalidOperationException: There was
an error reflecting type
'HannaPrintsDataAccess.Customer'.]
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1621
System.Xml.Serialization.XmlReflectionImporter.ImportAccessorMapping(MemberMapping
accessor, FieldModel model,
XmlAttributes a, String ns, Type
choiceIdentifierType, Boolean rpc,
Boolean openModel, RecursionLimiter
limiter) +10296
System.Xml.Serialization.XmlReflectionImporter.ImportFieldMapping(StructModel
parent, FieldModel model,
XmlAttributes a, String ns,
RecursionLimiter limiter) +139
System.Xml.Serialization.XmlReflectionImporter.InitializeStructMembers(StructMapping
mapping, StructModel model, Boolean
openModel, String typeName,
RecursionLimiter limiter) +1273

[InvalidOperationException: There was
an error reflecting property
'Customer'.]
System.Xml.Serialization.XmlReflectionImporter.InitializeStructMembers(StructMapping
mapping, StructModel model, Boolean
openModel, String typeName,
RecursionLimiter limiter) +2167
System.Xml.Serialization.XmlReflectionImporter.ImportStructLikeMapping(StructModel
model, String ns, Boolean openModel,
XmlAttributes a, RecursionLimiter
limiter) +460
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1415

[InvalidOperationException: There was
an error reflecting type
'HannaPrintsDataAccess.CustomerAddress'.]
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1621
System.Xml.Serialization.XmlReflectionImporter.CreateArrayElementsFromAttributes(ArrayMapping
arrayMapping, XmlArrayItemAttributes
attributes, Type arrayElementType,
String arrayElementNs,
RecursionLimiter limiter) +227
System.Xml.Serialization.XmlReflectionImporter.ImportArrayLikeMapping(ArrayModel
model, String ns, RecursionLimiter
limiter) +207
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1143

[InvalidOperationException: There was
an error reflecting type
'HannaPrintsDataAccess.CustomerAddress[]'.]
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, Boolean repeats,
Boolean openModel, RecursionLimiter
limiter) +1621
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel
model, String ns, ImportContext
context, String dataType,
XmlAttributes a, RecursionLimiter
limiter) +28
System.Xml.Serialization.XmlReflectionImporter.ImportElement(TypeModel
model, XmlRootAttribute root, String
defaultNamespace, RecursionLimiter
limiter) +125
System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type
type, XmlRootAttribute root, String
defaultNamespace) +97
System.Xml.Serialization.XmlSerializer..ctor(Type
type, String defaultNamespace) +461
System.Xml.Serialization.XmlSerializer..ctor(Type
type) +6
HannaPrintsBusiness.Services.Live.CustomerService.GetCustomerAddressesXml(CustomerAddress[]
customerAddresses) in
E:\ProjectsOld\HannaPrints\HannaPrintsBusiness\Services\Live\CustomerService.cs:148
CreateGreetingCard.orderButton_Click(Object
sender, EventArgs e) in
c:\HostingSpaces\greetwus\galadavetiye.com\wwwroot\HannaPrints\HannaPrints\WebUI\CreateGreetingCard.aspx.cs:198
System.Web.UI.WebControls.Button.OnClick(EventArgs
e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String
eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument)
+13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection
postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean
includeStagesAfterAsyncPoint) +1565

I cant seem to figure this out, I am pretty sure its just some configuration that needs to be changed because before we got this code, supposedly it was working correctly, but we cant figure out why we are getting this error. If anyone could help that would be great. Thanks!!!

UPDATE
I tried changing the IList to List, but it does not do anything. Here is my classes with the customer address:

CUSTOMER CLASS:::

using System;

using System.Collections.Generic;
using Castle.ActiveRecord;

namespace HannaPrintsDataAccess
{
public partial class Customer
{
private IList _customerAddresses;

    public CustomerAddress GetPrimaryCustomerAddress()
    {
        foreach (CustomerAddress address in _customerAddresses)
        {
            if (address.IsPrimary)
                return address;
        }
        return null;
    }


    [HasMany(typeof(CustomerAddress), ColumnKey = "CustomerId", Table = "Customer")]
    public virtual IList<CustomerAddress> CustomerAddresses
    {
        get
        {
            return this._customerAddresses;
        }
        set
        {
            this._customerAddresses = value;
        }
    }
}

}

Here is the Customer Address class::::

using System.IO;

using System.Xml.Serialization;
using Castle.ActiveRecord;

namespace HannaPrintsDataAccess
{
public partial class CustomerAddress
{
public string ToXml()
{
XmlSerializer serializer = new XmlSerializer(GetType());
MemoryStream memoryStream = new MemoryStream();
serializer.Serialize(memoryStream, this);
memoryStream.Seek(0, SeekOrigin.Begin);
return new StreamReader(memoryStream).ReadToEnd();
}

    [BelongsTo("CustomerId")]
    public virtual Customer Customer { get; set; }
}

}

Thanks again for your help

Best Answer

As the error message explicitly tells you the XmlSerializer cannot serialize interfaces.

You probably had:

public List<CustomerAddress> CustomerAddresses  { get; set; }

which you changed to:

public IList<CustomerAddress> CustomerAddresses  { get; set; }

which no longer works.

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