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Xceed Toolkit Plus for WPF v5.1 Documentation
Xceed.Wpf.ListBox Assembly / Xceed.Wpf.Data Namespace / AsyncDataSourceProvider Class / BeginExecuteCountQuery Method
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.


In This Topic
    BeginExecuteCountQuery Method (AsyncDataSourceProvider)
    In This Topic
    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.
    Supported Frameworks

    .NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

    .NET Framework: net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

    See Also

    Reference

    AsyncDataSourceProvider Class
    AsyncDataSourceProvider Members

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