DataServiceRequest<TElement> 클래스

정의

generic <typename TElement>
public ref class DataServiceRequest sealed : System::Data::Services::Client::DataServiceRequest

public sealed class DataServiceRequest<TElement> : System.Data.Services.Client.DataServiceRequest

type DataServiceRequest<'Element> = class
    inherit DataServiceRequest

Public NotInheritable Class DataServiceRequest(Of TElement)
Inherits DataServiceRequest

형식 매개 변수

상속

Object

DataServiceRequest

DataServiceRequest<TElement>

예제

반환될 때 ExecuteBatch 일괄 처리 요청에 대한 전체 HTTP 응답은 네트워크 스트림에서 읽어왔지만 응답은 처리되지 않았습니다. ID 확인 및 개체 구체화는 다음 예제와 같이 반복될 때까지 응답에서 지정된 엔터티에 대해 발생하지 않습니다.

DataServiceContext service = new DataServiceContext(new
                                                    Uri("http://myserviceroot"));

// Create query batches.
DataServiceRequest[] reqs = new DataServiceRequest[] {
    new DataServiceRequest<Category>(
            new Uri("http://myserviceroot/Categories")),
            new DataServiceRequest<Customer>(
            new Uri("http://myserviceroot/Customers"))
};

DataServiceResponse dsr;
try
{
    // Client will not throw an exception on ExecuteBatch because the
    // entire response has not been processed yet to know
    // whether an exception should be thrown.

    dsr = service.ExecuteBatch(reqs);

    if (dsr.IsBatchResponse)
    {
        /*inspect HTTP artifacts associated with the entire batch:
                      dsr.BatchHeaders, dsr.BatchStatusCode*/ }

    foreach (QueryOperationResponse qr in dsr)
    {
        if (IsErrorStatusCode(qr.StatusCode))
        {
            //q.Error.Message contains the full contents of the error.
            /* process any part of the Error Contract (<error> element)
                      sent from the service.  */
            }
        }
        else
        {
            if (qr.Query.ElementType == typeof(Customer))
            {
                //process customers
                foreach (Customer c in qr){ /*process the customer*/ }

                // the DataServiceContext does not materialize, resolve
                // identity on Customer until it is enumerated.
            }
            else if (qr.Query.ElementType == typeof(Category))
            {
                // Process categories.
                foreach (Category cat in qr)
                {
                    /*process the category*/
                 }
                // the DataServiceContext does not materialize or
                // resolve identity on the Category until
                // it is enumerated.
                // This means that instream errors will be thrown
                // during iteration.
            }
        }
    }
}
catch (DataServiceRequestException e)
{
    // This error is thrown if the data service returns with
    // a response code < 200 or >299 or the top level element.
    // If neither of the above or true, this exception is not
    // thrown.

    dsr = e.Response;

    if (dsr.IsBatchResponse)
    {
        /*inspect HTTP artifacts associated with the entire batch:
                        dsr.BatchHeaders, dsr.BatchStatusCode*/
    }

    /* There will always only be one of these because if the top level
     status code was >=200 and =<299 and the first element was not an
     error, the call to start the query will not throw. */

    foreach (QueryOperationResponse qr in dsr)
    {
        if (qr.Error != null)
        {
            // Process error.
        }
    }
}

설명

데이터 서비스에 일괄 처리로 제출된 쿼리 그룹에서 쿼리는 인스턴스로 DataServiceRequest<TElement> 지정됩니다. 일괄 처리 요청의 응답을 전체적으로 나타내는 A DataServiceResponse 가 반환됩니다. 개별 쿼리 응답은 인스턴스를 열거하여 DataServiceResponse 액세스할 수 있는 개체로 QueryOperationResponseOperationResponse표시됩니다.