JSON Nullable Deserialization Error - ajax

Suppose you have a simple struct, like so:
public struct Point
{
public int X { get; set; }
public int Y { get; set; }
}
And a sample class like so:
public class Map
{
public int ID { get; set; }
public Point? PointA { get; set; }
///...
}
Now, suppose you are passing Map via AJAX as JSON. Question, what value should be passed for the not null scenario?
It may matter that JavaScriptSerializer is being used in a C# 3.5 ASP.NET ASMX web service.

The issue is what I listed in my comment about the question. The automatic properties were the issue. I converted the property and the issue was resolved.

Related

WebAPI AND Odata V4 issue: ComplexType containing Entities

I am getting following error while adding relationship inside the complex type. How can I fix this issue. I binged and read that it was issue with OData V3 but not in OData V4.
The complex type 'Microsoft.OneIM.ActiveIncident.Contracts.IncidentImpact' refers to the entity type 'Microsoft.OneIM.ActiveIncident.Contracts.ImpactedService' through the property 'ImpactedServices'.
at System.Web.OData.Builder.ODataConventionModelBuilder.MapComplexType(ComplexTypeConfiguration complexType)
at System.Web.OData.Builder.ODataConventionModelBuilder.MapType(StructuralTypeConfiguration edmType)
at System.Web.OData.Builder.ODataConventionModelBuilder.AddComplexType(Type type)
at System.Web.OData.Builder.ODataConventionModelBuilder.ReconfigureEntityTypesAsComplexType(EntityTypeConfiguration[] misconfiguredEntityTypes)
at System.Web.OData.Builder.ODataConventionModelBuilder.RediscoverComplexTypes()
at System.Web.OData.Builder.ODataConventionModelBuilder.GetEdmModel()
at Microsoft.OneIM.ActiveIncident.Service.ModelBuilder.BuildIncidentModels() in c:\OneIM\EngSys\OneIM\ActiveIncident\src\Product\Service\Models\ModelBuilder.cs:line 42
at Microsoft.OneIM.ActiveIncident.Service.WebApiConfig.Register(HttpConfiguration config) in c:\OneIM\EngSys\OneIM\ActiveIncident\src\Product\Service\App_Start\WebApiConfig.cs:line 22
at Microsoft.OneIM.ActiveIncident.ServiceHost.ApiStartup.Configuration(IAppBuilder appBuilder) in c:\OneIM\EngSys\OneIM\ActiveIncident\src\Product\ServiceHost\ApiStartup.cs:line 27
My model looks as below
public class Incident
{
public IncidentImpact Impact { get; set; }
}
[ComplexType]
public class IncidentImpact
{
public bool IsCustomerImpacting { get; set; }
public string SupportTicketId { get; set; }
public ICollection<ImpactedService> ImpactedServices { get; set; }
}
public class ImpactedService
{
public long Id { get; set; }
public long IncidentId { get; set; }
public Incident Incident { get; set; }
public long ServiceId { get; set; }
}
Although OData protocol V4 support complex type contains entity as navigation property, both of OData Lib and WebAPI OData do not implementation this feature now.
You have to set a key property by [key] attribute or in the model builder as
builder.EntitySet<Type>("Types").EntityType.HasKey(t => t.KeyProperty);
Hope it helps.

Error deserializing JSON to a class with IEnumerable

I need to return a collection with nested optional collections from my WebAPI and convert it back to objects in my Web UI, however I'm getting the following error:
Cannot create and populate list type System.Linq.IQueryable`1[MyNamespace.MyClass].
I'm using Json.Net.
Here is a sample of my code:
public class ClassA
{
public Int64 Id { get; set; }
public String Description { get; set; }
public IEnumerable<ClassB> { get; set; }
}
public class ClassB
{
public Int64 Id { get; set; }
public String Description { get; set; }
}
I've saw some questions here in stackoverflow, but I don't have access to serialization options (it is handled internally by our library).
UPDATE
I've forgot to mention that ClassA is returned as an IQueryable in my Web API.
Changing the return type of my Web API method to IEnumerable instead of IQueryable solved the problem.

How can I turn on and off lazy loading with EF 5?

If I have the following objects:
public class Application
{
public int ApplicationId { get; set; }
public string Name { get; set; }
public virtual ICollection<TestAccount> TestAccounts { get; set; }
}
public class TestAccount
{
public int TestAccountId { get; set; }
public int ApplicationId { get; set; }
public string Name { get; set; }
public virtual Application Application { get; set; }
}
EF Mapping looks like this:
modelBuilder.Entity<Application>()
.HasMany(a => a.TestAccounts)
.WithRequired(t => t.Application)
.WillCascadeOnDelete(false);
In one part of my code I want to retrieve data for Application and have
it return TestAccount data.
In another part of my code I want to retrieve data for Application and
have it NOT return TestAccount data.
Is there a way I can make this happen with LINQ or some other way?
This question has already been answered here: Disable lazy loading by default in Entity Framework 4.
Basically, in the constructor of your DbContext, just add this:
this.Configuration.LazyLoadingEnabled = false;
I hope this helps.
EDIT
Also, if you want to know how to load it manually later, it should be a simple matter of using Include() like this:
var query = context.Application.Include(x => x.TestAccounts).ToList()

Json.Net JsonConvert not deserializing properly?

I'm using Json.Net to handle the deserialzing of the response of API calls from the Pipl.com API in my application, and it works fine but for some strange reason it won't deserialize a specific property of the JSON string that I feed to the JsonConvert.DeserializeObject method.
My class is this:
public class Source
{
public string Dsname { get; set; }
public bool IsSponsored { get; set; }
public string Url { get; set; }
public string Domain { get; set; }
public uint ExternalID { get; set; }
public Source()
{
}
}
and everything except the Dsname gets deserialized properly. The Json to be converted is like this:
"source": {
"#is_sponsored": false,
"#ds_name": "Personal Web Space -MySpace",
"url": "http://www.foo.bar"
"domain": "myspace.com"
}
Any idea how to go about this problem? Thank you in advance.
I added a wrapper class and specified the property name as attributes, like this:
public class Source
{
[JsonProperty(PropertyName = "#ds_name")]
public string Dsname { get; set; }
[JsonProperty(PropertyName = "#is_sponsored")]
public bool IsSponsored { get; set; }
public string Url { get; set; }
public string Domain { get; set; }
public uint ExternalID { get; set; }
}
public class RootObject
{
public Source source { get; set; }
}
Then I was able to deserialize fine:
var json = "{\"source\": { \"#is_sponsored\": true, \"#ds_name\": \"Personal Web Space -MySpace\", \"url\": \"http://www.foo.bar\", \"domain\": \"myspace.com\"}}";
var des = JsonConvert.DeserializeObject<RootObject>(json);
Note that I:
- wrapped your sample in a curly braces to make it valid JSON
- added a missing comma
- changed the value of "#is_sponsored" to not be the default value to verify it is desearialized correctly.
Ok I realize, this is a pretty old thread. But I ran into a similar issue earlier and came across this thread.
In my case the class I was trying to se/deserialize had a List<ClassName> public property in it. Which serialized fine, but wont deserialize. I switched it to ClassName[] and the fixed the deserialization problem.
Hope it helps someone else who comes across this thread, or at least gives them something else to look for.

How to update a property of an abstract with an inheriting/using a subblass in MVC

I have an abstract class
public abstract class Member
{
public string ID { get; set; }
public string Username { get; set; }
public int MemberType { get; set; }
public abstract string MemberName { get; set; }
public int Status { get; set; }
}
public class Person : Member
{
public string LastName { get; set; }
public string FirstName{ get; set; }
}
public class Business : Member
{
public string BusinessName { get; set; }
public string TaxNo { get; set; }
}
The class was mapped using fluent API,
Now, is there a way to update the "Status" property from the view(having Member model) without using or going to a subclass (Person/Business)?
I just tried it, but it says "Cannot create an abstract class.", when submitting the page.
Or there is a correct way to do this?
Thanks
Not in EF. You have to instantiate an object to work with EF, and you can't instantiate an abstract class.
You could make the class not be abstract. Or you could use a stored proc to update the field, or some direct sql.
It sounds like your problem is that your action method has an abstract type as a parameter, which the default model binder can't do anything with. If you are dead set on using the same view for two different classes, you may need to implement your own model binder to inspect in the incoming request and decide which type, Person or Business, to instantiate.
Check out this link for more information on creating a custom model binder:
http://odetocode.com/blogs/scott/archive/2009/05/05/iterating-on-an-asp-net-mvc-model-binder.aspx
This seems like a similar problem to the one I've answered previously here:
ASP.NET MVC 3: DefaultModelBinder with inheritance/polymorphism

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