WCF Service Library - wcf

I am new to WCF services. I was asked to manually create a WCF service. I did the following:
Created a new project Console App.
Created a class called Evaluation
Created an interface called IEvaluatorService
Created a class EvaluationService implementing the interface IEvaluatorService
I need to use the following address: http://localhost:8000/Evaluations then test my service via WcfTestClient. I am not sure what to do next. Code below.
Thanks in advance for any help!
namespace Evaluations
{
[ServiceContract]
interface IEvaluatorService
{
[OperationContract(Name="AddEvaluation")]
int Add(string user, string content);
[OperationContract(Name="RemoveEvaluation")]
void Remove([MessageParameter(Name="existingID")] int id);
[OperationContract(Name="GetAllEvaluations")]
Evaluation[] GetAll();
[OperationContract(Name="GetEvaluation")]
Evaluation Get(int id);
[OperationContract(Name="GetAllEvaluationsFrom")]
Evaluation[] GetAll([MessageParameter(Name = "username")] string submitter);
}
}
namespace Evaluations
{
class EvaluationService : IEvaluatorService
{
List<Evaluation> myList = new List<Evaluation>();
static int count = 0;
public int Add(string user, string content)
{
Evaluation eval = new Evaluation()
{
UniqueID = count++,
Submitter = user,
SubmissionTime = DateTime.Now,
Text = content
};
myList.Add(eval);
return eval.UniqueID;
}
public void Remove(int id)
{
myList.RemoveAt(id);
}
public Evaluation[] GetAll()
{
return myList.ToArray<Evaluation>();
}
public Evaluation Get(int id)
{
throw new NotImplementedException();
}
public Evaluation[] GetAll(string submitter)
{
throw new NotImplementedException();
}
}
}
namespace Evaluations
{
[DataContract]
class Evaluation
{
[DataMember]
public string Submitter { get; set; }
[DataMember]
public int UniqueID { get; set; }
[DataMember]
public DateTime SubmissionTime { get; set; }
[DataMember]
public string Text { get; set; }
}
}

The easiest thing to do is...
go into Visual Studio
right click on your project
select Add New
choose WCF Service
See what code Visual Studio added and follow that pattern for your service.

Related

exception:"type was not mapped" in entityframework codefirst with layers

i'm trying to apply LAYERS Concept on demo project developed using mvc and entity framework both
Data Annotations : for validations in Data Access Layer and
Fluent API : for mapping and tables relations
Problem : DbContext didn't Create DB and there is a Runtime Exception :
The type 'Domain.DataLayer.Member' was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation. Verify that the type was defined as a class, is not primitive, nested or generic, and does not inherit from EntityObject.
Code : my solutions consists of :
1- class library (Domain.Classes project): where i wrote all of my classes
public class Member
{
public int Id { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string FullName { get; set; }
}
2- DAL (Domain.DataLayer project): also another class library and i referenced domain.classes
namespace Domain.DataLayer.Repositories
{
[MetadataType(typeof(MemberMetadata))]
public partial class Member : Classes.Member , IValidatableObject
{
public Member()
{
Tasks = new HashSet<Task>();
History = new HashSet<Commint>();
}
public string ConfirmPassword { get; set; }
public HashSet<Task> Tasks { get; set; }
public HashSet<Commint> History { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
var result = new List<ValidationResult>();
if (!string.Equals(Password,ConfirmPassword))
{
result.Add(new ValidationResult("mismatch pwsd", new[] {"ConfirmPassword" }));
}
return result;
}
}
}
and i used repository pattern :
public class MemberRepository : IRepository<Member>
{
public Task<IQueryable<Member>> GetAllEntities()
{
return Task<IQueryable<Member>>.Factory.StartNew(() => new Context().Members.AsQueryable());
}
}
3-BLL : for sake of simplicity : there is no Business Logic Layer
4- PL (Domain.Application MVC Project) : Member Controller :
public async Task<ActionResult> Index()
{
var members = await _repository.GetAllEntities();
return View(members);
}
Note : i depended on DbContext to create DB with name like : Domain.DataLayer.Context but it didn't craete DB so i created the DB and passed the connectionString through Context constructor like this :
namespace Domain.DataLayer
{
public class Context : DbContext
{
public Context(): base("InterviewDemo") // i tried also base("name=InterviewDemo")
{
}
public DbSet<Member> Members { get; set; }
public DbSet<Task> Tasks { get; set; }
public DbSet<Commint> TaskHistory { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new MemberConfig());
modelBuilder.Configurations.Add(new TaskConfig());
modelBuilder.Configurations.Add(new CommintConfig());
base.OnModelCreating(modelBuilder);
}
}
}

howto initialize a wcf class

Im trying to use a Class in a WCF service. When im calling the
u.attributeChanges.Add(a);
i get:
"Object reference not set to an instance of an object"
If create the classes in the client application it's working.
UpdateChanges Class
[DataContract]
public class UpdateChanges
{
private void Initialize()
{
this.attributeChanges = new List<AttributeChanges>();
}
public UpdateChanges()
{
this.Initialize();
}
[DataMember]
public string objectGuid { get; set; }
[DataMember]
public Utilities.ObjectTypes objectType { get; set; }
[DataMember]
public Utilities.ChangeType changeType{ get; set; }
[DataMember]
public List<AttributeChanges> attributeChanges { get; set; }
[OnDeserializing]
public void OnDeserializing(StreamingContext ctx)
{
this.Initialize();
}
}
AttributeChanges class
[DataContract]
public class AttributeChanges
{
[DataMember]
public string attributeName { get; set; }
[DataMember]
public string attributeValue { get; set; }
}
Client Code:
Service.DirsyncServiceClient proxyClient;
proxyClient = Utilities.GetProxy("http://192.168.1.45/vDir/Service.svc");
Service.UpdateChanges u = new Service.UpdateChanges();
Service.AttributeChanges a = new Service.AttributeChanges();
a.attributeName = "Attribute1";
a.attributeValue = "Value1";
u.attributeChanges.Add(a);
proxyClient.SaveObject(u);
Anyonw know how to solve this?
You're using a generated client code.
The problem is that the client generates this code on base of the WSDL xlm. The code in the CTOR doesn't generated in the client because the client can't be aware of this code.
You have a few options-
1. Use a shared DLL with the data contract instead of generating it via a web reference.
2. Implement it yourself in a 'partial' class.

WCF RESTful Console-hosted, return 400 Bad Request

Studying WCF RESTful, host in a Console,
my steps:
create sample models
create contract of service
create service
host this service in a console.
run this host, looks ok.
create a winform, use service address via json post to service host.
i hope it would work, but return http 400.
I tried on WCF(not REST) Console-hosted, WebAPI, steps all ok.
finally, stackoverflow.com
please help
Models
[Serializable]
public abstract class Building
{
public Manufacturer Manufacturer { get; set; }
}
[Serializable]
public class Manufacturer
{
public string Name { get; set; }
public string Telephone { get; set; }
}
[Serializable]
public class Furniture : Building
{
public string Name { get; set; }
}
[Serializable]
public class Reception
{
public int Floor { get; set; }
public int Number { get; set; }
}
[Serializable]
public class Room : Building
{
public string Number { get; set; }
public List<Furniture> Furnitures { get; set; }
}
[Serializable]
public class Hotel : Building
{
public Guid Guid { get; set; }
public List<Reception> Receptions { get; set; }
public List<Room> Rooms { get; set; }
public string Name { get; set; }
public string Address { get; set; }
}
Contract
[ServiceContract]
public interface IHotel
{
// Create objct Hotel
[OperationContract]
[WebInvoke(UriTemplate = "", Method = "POST", RequestFormat= WebMessageFormat.Json, ResponseFormat=WebMessageFormat.Json)]
bool Create(Hotel hotel);
}
Service
public class HotelService : I Hotel
{
public bool Build(Models.Hotel hotel)
{
if (hotel == null)
return false;
// codes here is object hotel(EF) creation, test OK
return true;
}
}
Host(Console)
WebServiceHost serviceHost = new WebServiceHost(typeof(Demo.Services.HotelService), new Uri("http://192.168.1.101/HotelService"));
ServiceEndpoint endpoint = serviceHost.AddServiceEndpoint(typeof(Demo.Contracts.IHotel), new WebHttpBinding(), "");
ServiceDebugBehavior sdb = serviceHost.Description.Behaviors.Find<ServiceDebugBehavior>();
sdb.HttpHelpPageEnabled = false;
Console.WriteLine("Starting Service...");
// start service
serviceHost.Open();
Console.WriteLine("Started, press RETURN to exit.");
Console.ReadLine();
serviceHost.Close();
Client(Winform)
Caller
public bool BuildHotel(string json)
{
WebRequest request = HttpWebRequest.Create("http://192.168.1.101/HotelService");
request.ContentType = "application/json";
byte[] data = Encoding.UTF8.GetBytes(json);
request.ContentLength = data.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();
WebResponse response = request.GetResponse(); // 400 throwed here
Stream responseStream = response.GetResponseStream();
StreamReader responseStreamReader = new StreamReader(responseStream);
string result = responseStreamReader.ReadToEnd();
return true;
}
Json String for 'bool BuildHotel(string)' upon
{
"Guid":"ea59c011-d656-4870-b29b-30a44e668560",
"Receptions":[
{"Floor":1,"Number":1},
{"Floor":2,"Number":2}
],
"Rooms":[
{
"Number":"c",
"Furnitures":[
{"Name":"1","Manufacturer":{"Name":"1","Telephone":"1"}},
{"Name":"2","Manufacturer":{"Name":"2","Telephone":"2"}}
],
"Manufacturer":{"Name":"c","Telephone":"c"}
}
],
"Name":"x",
"Address":"x",
"Manufacturer":{"Name":"x","Telephone":"x"}
}
it expects such kind of JSON:
{"k_BackingField":{"k_BackingField":"4","k_BackingField":"4"},"k_BackingField":"x","k_BackingField":"ea59c011-d656-4870-b29b-30a44e668560","k_BackingField":"x","k_BackingField":[{"k_BackingField":1,"k_BackingField":1},{"k_BackingField":2,"k_BackingField":2}],"k_BackingField":[{"k_BackingField":{"k_BackingField":"3","k_BackingField":"3"},"k_BackingField":[{"k_BackingField":{"k_BackingField":"1","k_BackingField":"1"},"k_BackingField":"1"},{"k_BackingField":{"k_BackingField":"2","k_BackingField":"2"},"k_BackingField":"2"}],"k__BackingField":null}]}
To change it you can mark all your data contracts with DataContract and DataMember attribute:
[DataContract]
public abstract class Building
{
[DataMember]
public Manufacturer Manufacturer { get; set; }
}
In this case it will understand json as you have given us in the question and will process it successfully.

ServiceStack - calling 3rd party web service with class

I am trying to call a 3rd party web service
Their REST API uses the following URL style.
http://www.VoiceBase.com/services?version=1.0&apikey=your-apikey&password=secret&action=list&status=processing
All of their service calls go to the same /services
How do I create a class so the following would work?
var client = new JsonServiceClient("http://www.voicebase.com");
var response = client.Get<ResponseVoiceBaseListClass>(new VoiceBaseListClass());
Additional classes I have created but I am not quite there yet
public class VoiceBaseBaseClass
{
public string version { get; set; }
public string apikey { get; set; }
public string password { get; set; }
public VoiceBaseBaseClass()
{
this.version = "1.0";
this.apikey = "API";
this.password = "password";
}
}
public class VoiceBaseListClass : VoiceBaseBaseClass, IReturn<ResponseVoiceBaseListClass>
{
public string action { get; set; }
public string status { get; set; }
public VoiceBaseListClass()
: base()
{
this.action = "list";
this.status = "processing";
}
}
public class ResponseVoiceBaseListClass
{
public string requestStatus { get; set; }
public string statusMessage { get; set; }
public string fileStatus { get; set; }
public List<string> mediaIds { get; set; }
public ResponseVoiceBaseListClass()
{
this.mediaIds = new List<string>();
}
}
Using the above classes the call that goes to the server is
/json/syncreply/VoiceBaseListClass?action=list&status=processing&version=1.0&apikey=API&Password=password
Is there a way I can force the service stack client to go to the
/Services
instead of
/json/syncreply/VoiceBaseListClass
I found a way to do this and it is working great for me.
[RestService("/services", "GET")]
public class VoiceBaseListClass : VoiceBaseBaseClass, IReturn<ResponseVoiceBaseListClass>
{
}
Although this is a deprecated attribute - the new attribute is called Route
https://github.com/ServiceStack/ServiceStack/wiki/Release-Notes
Chris

WCF with Entity Framework Code First relationship

I'm learning WCF, and tried to make a small service that exposes a Project and its tasks (the standard Entity Framework hello world).
The class structure is the following:
public class Project
{
public int ProjectId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public DateTime CreationDate { get; set; }
public virtual ICollection<Task> Tasks { get; set; }
}
public class Task
{
public int TaskId { get; set; }
public string Title { get; set; }
public virtual Project RelatedProject { get; set; }
}
The DB context comes after:
public class ProjectContext : DbContext
{
public DbSet<Project> Projects { get; set; }
public DbSet<Task> Tasks { get; set; }
}
Finally, the service endpoint:
public IEnumerable<Project> getProjects()
{
ProjectContext p = new ProjectContext();
return p.Projects.AsEnumerable();
}
The problem is that this model will throw a System.ServiceModel.CommunicationException, but, If I remove the virtual properties from the model, It would work, but I would loose the entity framework links between Project and Task.
Anyone with a similar setup?
I banged my head against the wall several hours with this one. After extensive debugging, google gave the answer and I feel right to post it here since this was the first result I got in google.
Add this class on top of your [ServiceContract] interface declaration (typically IProjectService.cs
public class ApplyDataContractResolverAttribute : Attribute, IOperationBehavior
{
public void AddBindingParameters(OperationDescription description, BindingParameterCollection parameters)
{
}
public void ApplyClientBehavior(OperationDescription description, System.ServiceModel.Dispatcher.ClientOperation proxy)
{
var dataContractSerializerOperationBehavior =
description.Behaviors.Find<DataContractSerializerOperationBehavior>();
dataContractSerializerOperationBehavior.DataContractResolver =
new ProxyDataContractResolver();
}
public void ApplyDispatchBehavior(OperationDescription description, System.ServiceModel.Dispatcher.DispatchOperation dispatch)
{
var dataContractSerializerOperationBehavior =
description.Behaviors.Find<DataContractSerializerOperationBehavior>();
dataContractSerializerOperationBehavior.DataContractResolver =
new ProxyDataContractResolver();
}
public void Validate(OperationDescription description)
{
// Do validation.
}
}
Requirements are
using System.ServiceModel.Description;
using System.Data.Objects;
using System.ServiceModel.Channels;
Then under the [OperationContract] keyword add [ApplyDataContractResolver] keyword and you are set!
Big thanks to http://blog.rsuter.com/?p=286
For sending data trough WCF you should disable lazy loading (dataContext.ContextOptions.LazyLoadingEnabled = false;).
To be sure the data you want is loaded you need to use eager loading ( trough the Include method).
You need to change your function to:
public IEnumerable<Project> getProjects()
{
ProjectContext p = new ProjectContext();
p.ContextOptions.LazyLoadingEnabled = false;
return p.Projects.Include("Tasks").AsEnumerable();
}