QueryOperationResponse<T>.GetContinuation Método
Obtiene un objeto DataServiceQueryContinuation<T> que contiene el URI que se utiliza para recuperar la página de resultados siguiente.
Espacio de nombres: System.Data.Services.Client
Ensamblado: Microsoft.Data.Services.Client (en Microsoft.Data.Services.Client.dll)
Sintaxis
'Declaración
Public Function GetContinuation As DataServiceQueryContinuation(Of T)
'Uso
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>
Valor devuelto
Tipo: System.Data.Services.Client.DataServiceQueryContinuation<T>
Un objeto que contiene el URI que se utiliza para devolver la página de resultados siguiente.
Ejemplos
En este ejemplo se usa el método GetContinuation en un bucle do…while para cargar entidades Customers desde los resultados paginados del servicio de datos.
' 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);
}