Metodo QueryOperationResponse<T>.GetContinuation

Ottiene un oggetto DataServiceQueryContinuation<T> che contiene l'URI utilizzato per recuperare la successiva pagina dei risultati.

Spazio dei nomi  System.Data.Services.Client
Assembly:  Microsoft.Data.Services.Client (in Microsoft.Data.Services.Client.dll)

Sintassi

'Dichiarazione
Public Function GetContinuation As DataServiceQueryContinuation(Of T)
'Utilizzo
Dim instance As QueryOperationResponse
Dim returnValue As DataServiceQueryContinuation(Of T)

returnValue = instance.GetContinuation()

public DataServiceQueryContinuation<T> GetContinuation()

public:
DataServiceQueryContinuation<T>^ GetContinuation()

member GetContinuation : unit -> DataServiceQueryContinuation<'T> 

public function GetContinuation() : DataServiceQueryContinuation<T>

Valore restituito

Tipo: System.Data.Services.Client.DataServiceQueryContinuation<T>
Un oggetto che contiene l'URI utilizzato per restituire la successiva pagina dei risultati.

Esempi

In questo esempio viene utilizzato un metodo GetContinuation in un ciclo do…while per caricare entità Customers dai risultati di paging del servizio dati.

' Create the DataServiceContext using the service URI.
Dim context = New NorthwindEntities(svcUri)
Dim token As DataServiceQueryContinuation(Of Customer) = Nothing
Dim pageCount = 0

Try
    ' Execute the query for all customers and get the response object.
    Dim response As QueryOperationResponse(Of Customer) = _
        CType(context.Customers.Execute(), QueryOperationResponse(Of Customer))

    ' With a paged response from the service, use a do...while loop 
    ' to enumerate the results before getting the next link.
    Do
        ' Write the page number.
        Console.WriteLine("Page {0}:", pageCount + 1)

        ' If nextLink is not null, then there is a new page to load.
        If token IsNot Nothing Then
            ' Load the new page from the next link URI.
            response = CType(context.Execute(Of Customer)(token),  _
            QueryOperationResponse(Of Customer))
        End If

        ' Enumerate the customers in the response.
        For Each customer As Customer In response
            Console.WriteLine(vbTab & "Customer Name: {0}", customer.CompanyName)
        Next

        ' Get the next link, and continue while there is a next link.
        token = response.GetContinuation()
    Loop While token IsNot Nothing
Catch ex As DataServiceQueryException
    Throw New ApplicationException( _
            "An error occurred during query execution.", ex)
End Try

// Create the DataServiceContext using the service URI.
NorthwindEntities context = new NorthwindEntities(svcUri);
DataServiceQueryContinuation<Customer> token = null;
int pageCount = 0; 

try
{ 
    // Execute the query for all customers and get the response object.
    QueryOperationResponse<Customer> response =
        context.Customers.Execute() as QueryOperationResponse<Customer>;

    // With a paged response from the service, use a do...while loop 
    // to enumerate the results before getting the next link.
    do
    {
        // Write the page number.
        Console.WriteLine("Page {0}:", pageCount++);

        // If nextLink is not null, then there is a new page to load.
        if (token != null)
        {
            // Load the new page from the next link URI.
            response = context.Execute<Customer>(token)
                as QueryOperationResponse<Customer>;
        }

        // Enumerate the customers in the response.
        foreach (Customer customer in response)
        {
            Console.WriteLine("\tCustomer Name: {0}", customer.CompanyName);
        }
    }

    // Get the next link, and continue while there is a next link.
    while ((token = response.GetContinuation()) != null);
}
catch (DataServiceQueryException ex)
{
    throw new ApplicationException(
        "An error occurred during query execution.", ex);
}

Vedere anche

Riferimento

QueryOperationResponse<T> Classe

Overload GetContinuation

Spazio dei nomi System.Data.Services.Client