本文整理匯總了VB.NET中System.Data.Services.Client.DataServiceContext.BeginExecute方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET DataServiceContext.BeginExecute方法的具體用法？VB.NET DataServiceContext.BeginExecute怎麽用？VB.NET DataServiceContext.BeginExecute使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Data.Services.Client.DataServiceContext的用法示例。
在下文中一共展示了DataServiceContext.BeginExecute方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: BeginExecuteCustomersQuery
Public Shared Sub BeginExecuteCustomersQuery()
' Create the DataServiceContext using the service URI.
Dim context = New NorthwindEntities(svcUri)
' Define the delegate to callback into the process
Dim callback As AsyncCallback = AddressOf OnCustomersQueryComplete
' Define the query to execute asynchronously that returns
' all customers with their respective orders.
Dim query As DataServiceQuery(Of Customer) = _
context.Customers.Expand("Orders")
Try
' Begin query execution, supplying a method to handle the response
' and the original query object to maintain state in the callback.
query.BeginExecute(callback, query)
Catch ex As DataServiceQueryException
Throw New ApplicationException( _
"An error occurred during query execution.", ex)
End Try
End Sub
' Handle the query callback.
Private Shared Sub OnCustomersQueryComplete(ByVal result As IAsyncResult)
' Get the original query from the result.
Dim query As DataServiceQuery(Of Customer) = _
CType(result.AsyncState, DataServiceQuery(Of Customer))
' Complete the query execution.
For Each customer As Customer In query.EndExecute(result)
Console.WriteLine("Customer Name: {0}", customer.CompanyName)
For Each order As Order In customer.Orders
Console.WriteLine("Order #: {0} - Freight $: {1}", _
order.OrderID, order.Freight)
Next
Next
End Sub