DataServiceQueryContinuation<T>-Klasse
Kapselt einen URI, der die nächste Seite eines ausgelagerten WCF Data Services-Abfrageergebnisses zurückgibt.
Vererbungshierarchie
System.Object
System.Data.Services.Client.DataServiceQueryContinuation
System.Data.Services.Client.DataServiceQueryContinuation<T>
Namespace: System.Data.Services.Client
Assembly: Microsoft.Data.Services.Client (in Microsoft.Data.Services.Client.dll)
Syntax
'Declaration
Public NotInheritable Class DataServiceQueryContinuation(Of T) _
Inherits DataServiceQueryContinuation
'Usage
Dim instance As DataServiceQueryContinuation(Of T)
public sealed class DataServiceQueryContinuation<T> : DataServiceQueryContinuation
generic<typename T>
public ref class DataServiceQueryContinuation sealed : public DataServiceQueryContinuation
[<SealedAttribute>]
type DataServiceQueryContinuation<'T> =
class
inherit DataServiceQueryContinuation
end
JScript unterstützt keine generischen Typen und Methoden.
Typparameter
- T
Der Typ des Fortsetzungs-Tokens.
Der DataServiceQueryContinuation<T>-Typ macht folgende Elemente verfügbar.
Eigenschaften
Name | Beschreibung | |
---|---|---|
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NextLinkUri | Ruft den URI ab, der zum Zurückgeben der nächsten Datenseite aus einem ausgelagerten Abfrageergebnis verwendet wird. (Geerbt von DataServiceQueryContinuation.) |
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Methoden
Name | Beschreibung | |
---|---|---|
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Equals | (Geerbt von Object.) |
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Finalize | (Geerbt von Object.) |
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GetHashCode | (Geerbt von Object.) |
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GetType | (Geerbt von Object.) |
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MemberwiseClone | (Geerbt von Object.) |
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ToString | Gibt den nächsten Link-URI als Zeichenfolge zurück. (Geerbt von DataServiceQueryContinuation.) |
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Beispiele
Dieses Beispiel verwendet eine Schleife mit do…while zum Laden von Customers Entitäten aus einem Seitenergebnis vom Datendienst.
' 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);
}
Threadsicherheit
Alle öffentlichen static (Shared in Visual Basic)-Elemente dieses Typs sind Threadsicher. Für Instanzelemente wird die Threadsicherheit nicht gewährleistet.
Siehe auch
Verweis
System.Data.Services.Client-Namespace