Xceed DataGrid for Silverlight Documentation
BeginExecuteCountQuery Method (AsyncDataSourceProvider)


A CountQueryParameters that contains information about the operations that must be executed by the query on the underlying data source.
The AsyncCallback delegate to be called when the operation is complete.
An object containing state information for the operation.
Begins the asynchronous operation of querying the underlying data source for its count.
Syntax
'Declaration
 
Protected MustOverride Function BeginExecuteCountQuery( _
   ByVal queryParameters As CountQueryParameters, _
   ByVal callback As AsyncCallback, _
   ByVal state As Object _
) As IAsyncResult
'Usage
 
Dim instance As AsyncDataSourceProvider
Dim queryParameters As CountQueryParameters
Dim callback As AsyncCallback
Dim state As Object
Dim value As IAsyncResult
 
value = instance.BeginExecuteCountQuery(queryParameters, callback, state)
protected abstract IAsyncResult BeginExecuteCountQuery( 
   CountQueryParameters queryParameters,
   AsyncCallback callback,
   object state
)

Parameters

queryParameters
A CountQueryParameters that contains information about the operations that must be executed by the query on the underlying data source.
callback
The AsyncCallback delegate to be called when the operation is complete.
state
An object containing state information for the operation.

Return Value

An IAsyncResult representing the result of the operation.
Remarks
This method will only be called if CanCount is true. If the count is not known, CanCount should be set to false rather than returning a a null reference (Nothing in Visual Basic) or invalid value.
Requirements

Target Platforms: Windows 7, Windows Vista, Windows XP SP3, Windows Server 2008 family

See Also

Reference

AsyncDataSourceProvider Class
AsyncDataSourceProvider Members

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