WCF service to SQL server Data Error

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Hello All,

I am writing a WCF service that fetches data from SQL server database and shows it in front end using Linq to Entities.

Following is Class Interface:-

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;

namespace PIAService
{
    [ServiceContract]
    public interface IPIAService
    {
        [OperationContract]
        IQueryable<DataAccountDataModel> GetDetailsUsingPatientaccountNumber(string patientAccountNumber);
    }
}

Following is DataClass

C#

public class DataAccountDataModel
  {
      [DataMember]
      public String PatientAccountNumber { get; set; }
      [DataMember]
      public String PatientName { get; set; }
      [DataMember]
      public String BARStatus_ORPH { get; set; }
      [DataMember]
      public String AdmitDate { get; set; }
}

Following is Interface Function Implementtion

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;

using System.Data.Entity;
using StoreDB;

namespace PIAService
{
    [DataContract]
    public class PIAService : IPIAService 
    {

        public IQueryable <dataaccountdatamodel> GetDetailsUsingPatientaccountNumber(string patientAccountNumber)
        {
            PIADataModel piaData = new PIADataModel();
            
            IQueryable <dataaccountdatamodel> DAdetails = (from p in piaData.DataAccounts
                                                           where p.PatientAccountNumber == patientAccountNumber &&
                                                           p.Duplicate == false 
                                                           select p);

            return DAdetails;
         }
        
    }

By compiling this program i am getting the following error. Kindly help.

XML

Error	1	Cannot implicitly convert type 'System.Linq.IQueryable<storedb.dataaccount>' to 'System.Linq.IQueryable<piaservice.dataaccountdatamodel>'. An explicit conversion exists (are you missing a cast?)

Thanks in Advance.

Chowdary.

Posted 19-Aug-12 18:31pm

Charles Shob

Updated 19-Aug-12 18:47pm

Kenneth Haugland

v2

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2 solutions

Solution 3

you missing casting, try following

C#

IQueryable<dataaccountdatamodel> DAdetails = (from p in piaData.DataAccounts
                                                           where p.PatientAccountNumber == patientAccountNumber && p.Duplicate == false select p).ToList();

Posted 19-Aug-12 19:24pm

Sangramsingh Pawar

Updated 19-Aug-12 19:25pm

v2

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Prabhakaran Soundarapandian · Accepted Answer · 2012-08-19T19:09:00

If you are using entity framework means you no need to write DTO again, instead you can use your entity class.

try this

in your PIAService class

C#

List <dataaccountdatamodel> DAdetails = (from p in piaData.DataAccounts
                                                           where p.PatientAccountNumber == patientAccountNumber &&
                                                           p.Duplicate == false
                                                           select new dataaccountdatamodel{ AAA = p.aaa,BBB=p.bbb}.tolist<dataaccountdatamodel>());</dataaccountdatamodel>

add this in your interface IPIAService

C#

[OperationContract]
List <dataaccountdatamodel> GetDetailsUsingPatientaccountNumber(string patientAccountNumber);