Failed to Serialize the Response in Web API

Failed to serialize the response in Web API with Json

When it comes to returning data back to the consumer from Web Api (or any other web service for that matter), I highly recommend not passing back entities that come from a database. It is much more reliable and maintainable to use Models in which you have control of what the data looks like and not the database. That way you don't have to mess around with the formatters so much in the WebApiConfig. You can just create a UserModel that has child Models as properties and get rid of the reference loops in the return objects. That makes the serializer much happier.

Also, it isn't necessary to remove formatters or supported media types typically if you are just specifying the "Accepts" header in the request. Playing around with that stuff can sometimes make things more confusing.

Example:

public class UserModel {
    public string Name {get;set;}
    public string Age {get;set;}
    // Other properties here that do not reference another UserModel class.
}

Failed to serialize the response body for content type

The IdentityEqualityCompairer in the NHibernate framework appears to have the [SerializableAttribute] annotation.

Taken from a comment on an answer here Why won't Web API deserialize this but JSON.Net will? it looks like JSON.NET is configured a little differently between WebApi usage and it's standalone usage.

Json.NET serializer by default set the IgnoreSerializableAttribute to true. In WebAPI, we set that to false.

So given you cannot take the [SerializableAttribute] off (as it is not within your code) you could try changing the default WebApi JSON.NET setting to ignore it using this answer here:

((DefaultContractResolver)config.Formatters.JsonFormatter.SerializerSettings.ContractResolver).IgnoreSerializableAttribute = true;

Perhaps also consider Using a DTO for your results being sent over in the response - this will give you full control over the object being sent over the wire.

Asp.Net Web API Error: The 'ObjectContent`1' type failed to serialize the response body for content type 'application/xml; charset=utf-8'

I would suggest Disable Proxy Creation only in the place where you don't need or is causing you trouble. You don't have to disable it globally you can just disable the current DB context via code...

    [HttpGet]
    [WithDbContextApi]
    public HttpResponseMessage Get(int take = 10, int skip = 0)
    {
        CurrentDbContext.Configuration.ProxyCreationEnabled = false;

        var lista = CurrentDbContext.PaymentTypes
            .OrderByDescending(x => x.Id)
            .Skip(skip)
            .Take(take)
            .ToList();

        var count = CurrentDbContext.PaymentTypes.Count();

        return Request.CreateResponse(HttpStatusCode.OK, new { PaymentTypes = lista, TotalCount = count });
    }

Here I only disabled the ProxyCreation in this method, because for every request there is a new DBContext created and therefore I only disabled the ProxyCreation for this case .
Hope it helps

asp.net WebApi: failed to serialize the response body for content type 'application/xml; charset=utf-8'

According to this error, you should annotate your classes, functions and properties as DataContractAttribute and DataMemberAttribute attributes in order to serialize as xml.

Web API: Failed to serialize the response body for content type

The problem looks to be that, in certain situations, you are returning from WriteJson() without writing anything, specifically when customType.TimeZone == null:

    var customType = (CustomType)value;
    if (customType == null || null== customType.TimeZone) return;

Doing so will result in an invalid JSON object, because the property name will already have been written by the caller, resulting in:

{
    "customType":
}

Trying to do this results in the exception you are seeing.

Instead, you need to prevent the property itself from being serialized. That's not possible in the converter however, it needs to be done in the containing type.

To avoid serializing a property with a null value, you should set NullValueHandling = NullValueHandling.Ignore in serializer settings, or on the property itself:

public class ContainerClass
{
    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public CustomType CustomType { get; set; }
}

To prevent serializing your property when its TimeZone property is null, you should use conditional property serialization by adding a ShouldSerializeXXX() method to the containing type, where XXX exactly matches your property name:

public class ContainerClass
{
    public CustomType CustomType { get; set; }

    public bool ShouldSerializeCustomType()
    {
        return CustomType != null && CustomType.TimeZone != null;
    }
}

Web Api - The 'ObjectContent type failed to serialize

I might be wrong, but the InnerException seems to be suggesting that anonymous types can't be serialized.

Try declaring a class such as

public class EnumInfo {
    public int Id { get; set; }
    public string Description { get; set; }

    public EnumInfo(int id, string description) {
        Id = id;
        Description = description;
    }
}

and turning your Select call into

[...].Select(x => new EnumInfo((Int32)x, x.Attribute<DescriptionAttribute>().Description);

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