DataServiceQueryContinuation<T> Classe

Definição

Namespace:

System.Data.Services.Client

Assembly:

System.Data.Services.Client.dll

Encapsula um URI que retorna a próxima página de um resultado paginado da consulta do WCF Data Services.

generic <typename T>
public ref class DataServiceQueryContinuation sealed : System::Data::Services::Client::DataServiceQueryContinuation

public sealed class DataServiceQueryContinuation<T> : System.Data.Services.Client.DataServiceQueryContinuation

type DataServiceQueryContinuation<'T> = class
    inherit DataServiceQueryContinuation

Public NotInheritable Class DataServiceQueryContinuation(Of T)
Inherits DataServiceQueryContinuation

Parâmetros de tipo

T

O tipo de token de continuação.

Herança

Object

DataServiceQueryContinuation

DataServiceQueryContinuation<T>

Exemplos

Este exemplo usa um do…while loop para carregar Customers entidades de um resultado paginado do serviço de dados.

// 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);
}

' 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

Propriedades

NextLinkUri

Obtém o URI usado para retornar a próxima página de dados de um resultado paginado da consulta. (Herdado de DataServiceQueryContinuation)

Métodos

Equals(Object)	Determina se o objeto especificado é igual ao objeto atual. (Herdado de Object)
GetHashCode()	Serve como a função de hash padrão. (Herdado de Object)
GetType()	Obtém o Type da instância atual. (Herdado de Object)
MemberwiseClone()	Cria uma cópia superficial do Object atual. (Herdado de Object)
ToString()	Retorna o próximo URI de link como uma cadeia de caracteres. (Herdado de DataServiceQueryContinuation)

Confira também

• Carregando conteúdo adiado (WCF Data Services)