In previous article, we had discussed about Win Forms validation using VAB adapter. In this article, we will look into WCF adapter.
Create a new WCF Service Library project in VS 2008 and name it as WCFAdapterVAB. Now add the following dlls present in Enterprise Library installation folder:
- Microsoft.Practices.EnterpriseLibrary.Common,
- Microsoft.Practices.EnterpriseLibrary.Validation.Validators and
- Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF
Now, delete all the existing class files in the project. We need to add DataContract, ServiceContract for Service. Add a class file named as Employee.cs for DataContract with below code:
using Microsoft.Practices.EnterpriseLibrary.Common;
using Microsoft.Practices.EnterpriseLibrary.Validation;
using Microsoft.Practices.EnterpriseLibrary.Validation.Validators;
using Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF;
namespace WCFAdapterVAB
{
[DataContract]
public class Employee
{
[DataMember]
public int EmpID { get; set; }
[DataMember]
[StringLengthValidator(1, RangeBoundaryType.Inclusive, 10, RangeBoundaryType.Inclusive, MessageTemplate = "Name must be between 1 and 10.")]
public string EmpName { get; set; }
[DataMember]
public double Salary { get; set; }
[DataMember]
public string EmpMailID { get; set; }
}
}
Add another class named as IEmpService.cs for ServiceContract with below code:
namespace WCFAdapterVAB
{
[ServiceContract]
[ValidationBehavior]
public interface IEmpService
{
[OperationContract]
[FaultContract(typeof(ValidationFault))]
void AddEmployee(Employee objEmp);
[OperationContract]
[FaultContract(typeof(ValidationFault))]
Employee GetEmpDetails([RangeValidator(1,RangeBoundaryType.Inclusive,100, RangeBoundaryType.Inclusive,MessageTemplate="ID should be between 1-100")]int id);
}
}
We need to specify FaultContract property for methods throwing validation errors.
Now, we will implement the service methods in another class file named as EmpService.cs with below code:
namespace WCFAdapterVAB
{
public class EmpService : IEmpService
{
#region IEmpService Members
private List<Employee> empList = new List<Employee>();
public void AddEmployee(Employee objEmp)
{
empList.Add(objEmp);
}
public Employee GetEmpDetails(int id)
{
return empList.Find(e => e.EmpID.ToString().Equals(id.ToString()));
}
#endregion
}
}
Here, we are validating parameter range for GetEmpDetails and attribute-based validation on EmpName.
Build the solution and run/deploy the service. Now, we need to create a client for testing this service. So, create a new console application and name it as WCFAdapterVABClient. Add service reference of the WCFAdapterVAB and write the below code in Program.cs:
using Microsoft.Practices.EnterpriseLibrary.Validation;
using Microsoft.Practices.EnterpriseLibrary.Validation.Validators;
using Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF;
using System.ServiceModel;
namespace WCFAdapterVABClient
{
class Program
{
static void Main(string[] args)
{
try
{
EmpService1.EmpServiceClient service1 = new
WCFAdapterVABClient.EmpService1.EmpServiceClient();
EmpService1.Employee objemp =
new WCFAdapterVABClient.EmpService1.Employee();
objemp.EmpID = 15;
objemp.EmpName = "c-sharpcorner";
service1.AddEmployee(objemp);
EmpService1.Employee emp = service1.GetEmpDetails(15);
EmpService1.Employee objemp1 = service1.GetEmpDetails(150);
}
catch (FaultException<ValidationFault> ex)
{
ValidationFault fault = ex.Detail;
foreach (ValidationDetail validationResult in fault.Details)
{
Console.WriteLine(validationResult.Message);
}
Console.ReadLine();
}
}
}
}
Run the client application, the output will be like this:
![]()
Suggestion:
When we debug WCF service having VAB validation, sometimes we may get unhandled user exceptions; to handle that goto VS ![]()
Debug ![]()
Exceptions ![]()
Uncheck User-unhandled checkbox under CLR Exceptions for ServiceModel and other required classes.
I am ending the things here. I am attaching source code for reference. In coming articles, we will go deep into this Application block. I hope this article will be helpful for all.