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POlinq to sql list with selected column in Restful service
 

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  1. POlinq to sql list with selected column in Restful service
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    <p>I have create a restful service which returning a List an entity type:</p> <pre><code> [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class RealAgent : IRealAgent { public IList&lt;RealUser&gt; GetAll() { return UserManager.Agents(); } } </code></pre> <p>//User Manager class implementation</p> <pre><code> public static List&lt;RealUser&gt; Agents() { var q = from x in DBContextHelper.DBContext.RealUsers orderby x.CreatedOn descending select new RealUser() { FirstName = x.FirstName, LastName =x.LastName, AboutProfession = x.AboutProfession }; return q.ToList(); } </code></pre> <p>// I am fetching selected column. But it is not working. Do I need to create own class OR It is possible to implement with Entity Framework?</p> <p>Error: The server encountered an error processing the request. The exception message is 'The entity or complex type 'GharbarIndia.Data.RealUser' cannot be constructed in a LINQ to Entities query.'. See server logs for more details. The exception stack trace is:</p> <p>at System.Data.Objects.ELinq.ExpressionConverter.CheckInitializerType(Type type) at System.Data.Objects.ELinq.ExpressionConverter.MemberInitTranslator.TypedTranslate(ExpressionConverter parent, MemberInitExpression linq) at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator<code>1.Translate(ExpressionConverter parent, Expression linq) at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq) at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input) at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input, DbExpressionBinding&amp; binding) at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.OneLambdaTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, DbExpression&amp; source, DbExpressionBinding&amp; sourceBinding, DbExpression&amp; lambda) at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.SelectTranslator.Translate(ExpressionConverter parent, MethodCallExpression call) at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.SequenceMethodTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, SequenceMethod sequenceMethod) at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.TypedTranslate(ExpressionConverter parent, MethodCallExpression linq) at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator</code>1.Translate(ExpressionConverter parent, Expression linq) at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq) at System.Data.Objects.ELinq.ExpressionConverter.Convert() at System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable<code>1 forMergeOption) at System.Data.Objects.ObjectQuery</code>1.GetResults(Nullable<code>1 forMergeOption) at System.Data.Objects.ObjectQuery</code>1.System.Collections.Generic.IEnumerable.GetEnumerator() at System.Collections.Generic.List<code>1..ctor(IEnumerable</code>1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at GharbarIndia.Data.User.UserManager.Agents() in E:\Gharbarindia\Dev\GharbarIndia.Data\User\UserManager.cs:line 179 at GharbarIndia.ServiceCore.RealAgent.GetAll() in E:\Gharbarindia\Dev\GharbarIndia.ServiceCore\RealAgent.cs:line 16 at SyncInvokeGetAll(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&amp; rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</p>
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    1. This table or related slice is empty.
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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