DataServiceRequest<TElement> Class


Represents request objects submitted as a batch to the data service.

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

Type Parameters



When ExecuteBatch returns, the entire HTTP response for the batch request has been read from the network stream, but the responses have not been processed. Identity resolution and object materialization do not occur for a specified entity in the response until it is iterated as shown in the following example.

DataServiceContext service = new DataServiceContext(new   

// 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;  
    // 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.  */  
            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.  


In a group of queries submitted as a batch to the data service, the queries are specified as DataServiceRequest<TElement> instances. A DataServiceResponse is returned that represents the response of the batch request as a whole. Individual query responses are represented as QueryOperationResponse objects, derived from OperationResponse, that are accessible by enumerating the DataServiceResponse instance.



Initializes a new instance of the DataServiceRequest<TElement> class.



Gets the type of the object used to create the DataServiceRequest<TElement> instance.


Gets the URI object that contains the request string.



Determines whether the specified object is equal to the current object.

(Inherited from Object)

Serves as the default hash function.

(Inherited from Object)

Gets the Type of the current instance.

(Inherited from Object)

Creates a shallow copy of the current Object.

(Inherited from Object)

Represents the URI of the query to the data service.

(Inherited from DataServiceRequest)

Applies to