查询服务基于位置的分页在 MVC Web API 中不起作用

Question

我想通过 MVC WebAPI 从 Dynamics AX 2012 的查询服务中使用分页来获取记录。 当我在控制台应用程序中运行此代码时工作正常。

QueryServiceClient client = new QueryServiceClient();

            DataSet dataSet;
            Paging paging = new PositionBasedPaging() { StartingPosition = 1, NumberOfRecordsToFetch = 10 };

            QueryMetadata query = new QueryMetadata();
            QueryDataSourceMetadata customerDataSource;

            query.QueryType = QueryType.Join;
            query.DataSources = new QueryDataSourceMetadata[1];

            customerDataSource = new QueryDataSourceMetadata();
            customerDataSource.Name = "AccountNum";
            customerDataSource.Enabled = true;
            customerDataSource.FetchMode = FetchMode.OneToOne;
            customerDataSource.Table = "CustTable";
            customerDataSource.Company = "CEU";
            customerDataSource.DynamicFieldList = true;
            customerDataSource.OrderMode = OrderMode.OrderBy;

            query.DataSources[0] = customerDataSource;
            query.OrderByFields = new QueryDataOrderByMetadata[]{
                new QueryDataOrderByMetadata(){ DataSource="AccountNum", FieldName="AccountNum",SortOrder=SortOrder.Ascending}
            };

            dataSet = client.ExecuteQuery(query, ref paging);

但相同的代码在 MVC WebAPI 中运行时会报错

System.ServiceModel.FaultException`1 was unhandled by user code
  HResult=-2146233087
  Message=Page size 'PositionBasedPaging.StartingPosition' is out of range.
Parameter name: PositionBasedPaging.StartingPosition
  Source=mscorlib
  Action=http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher/fault
  StackTrace:
    Server stack trace:
       at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
       at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
       at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
       at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
       at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
    Exception rethrown at [0]:
       at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
       at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
       at SL_AX_MVC_WebAPI.QueryService.IQueryService.ExecuteQuery(ExecuteQueryRequest request)
       at SL_AX_MVC_WebAPI.QueryService.QueryServiceClient.SL_AX_MVC_WebAPI.QueryService.IQueryService.ExecuteQuery(ExecuteQueryRequest request) in d:\Projects\SL_AX_MVC\SL_AX_MVC_WebAPI\Service References\QueryService\Reference.cs:line 5269
       at SL_AX_MVC_WebAPI.QueryService.QueryServiceClient.ExecuteQuery(QueryMetadata queryMetadata, Paging& paging) in d:\Projects\SL_AX_MVC\SL_AX_MVC_WebAPI\Service References\QueryService\Reference.cs:line 5276
       at SL_AX_MVC_WebAPI.Repositories.CustomerRepository.getCustomers(Int32 skip, Int32 take) in d:\Projects\SL_AX_MVC\SL_AX_MVC_WebAPI\Repositories\CustomerRepository.cs:line 108
       at SL_AX_MVC_WebAPI.Repositories.CustomerRepository.Get(Int32 skip, Int32 take) in d:\Projects\SL_AX_MVC\SL_AX_MVC_WebAPI\Repositories\CustomerRepository.cs:line 47
       at SL_AX_MVC_WebAPI.Controllers.CustomerController.Get(Int32 skip, Int32 take) in d:\Projects\SL_AX_MVC\SL_AX_MVC_WebAPI\Controllers\CustomerController.cs:line 31
       at lambda_method(Closure , Object , Object[] )
       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass13.<GetExecutor>b__c(Object instance, Object[] methodParameters)
       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.<>c__DisplayClass5.<ExecuteAsync>b__4()
       at System.Threading.Tasks.TaskHelpers.RunSynchronously[TResult](Func`1 func, CancellationToken cancellationToken)
  InnerException:

有什么帮助吗？我浪费了我的时间来解决这个问题，但没有成功......

Answer 1

问题解决了！ 在 WebAPI 中使用时，Dynamics AX 2012 的 QueryService 需要其他属性来为给定的任何属性提供值 true。 这些属性是名称为“Specified”的后修复。这些属性必须赋值为 true，否则将抛出异常或不返回任何数据。

正确代码如下：

QueryServiceClient client = new QueryServiceClient();

        DataSet dataSet;
        Paging paging = new PositionBasedPaging() { StartingPosition = 1, NumberOfRecordsToFetch = 10, NumberOfRecordsToFetchSpecified = true, StartingPositionSpecified = true };

        QueryMetadata query = new QueryMetadata();
        QueryDataSourceMetadata customerDataSource;

        query.QueryType = QueryType.Join;
        query.DataSources = new QueryDataSourceMetadata[1];

        customerDataSource = new QueryDataSourceMetadata();
        customerDataSource.Name = "AccountNum";
        customerDataSource.Enabled = true;
        customerDataSource.FetchMode = FetchMode.OneToOne;
        customerDataSource.Table = "CustTable";
        customerDataSource.Company = "CEU";
        customerDataSource.DynamicFieldList = true;
        customerDataSource.OrderMode = OrderMode.OrderBy;

        customerDataSource.EnabledSpecified =
        customerDataSource.FetchModeSpecified =
        customerDataSource.DynamicFieldListSpecified =
        customerDataSource.OrderModeSpecified = true;

        query.DataSources[0] = customerDataSource;
        query.OrderByFields = new QueryDataOrderByMetadata[]{
            new QueryDataOrderByMetadata(){ DataSource="AccountNum", FieldName="AccountNum",SortOrder=SortOrder.Ascending}
        };

        dataSet = client.ExecuteQuery(query, ref paging);