public BackgroundQuery(RowSourceWrapper rowSource, TaskScheduler backgroundTaskScheduler, IQueryRequest queryRequest)
{
RowSource = rowSource;
BackgroundTaskScheduler = backgroundTaskScheduler;
QueryRequest = queryRequest;
_rootCancellationToken = QueryRequest.CancellationToken;
}
public Request(QueryRequestor queryRequestor, QueryLock queryLock, RowSourceWrapper rowSourceWrapper)
{
_queryRequestor = queryRequestor;
RowSourceWrapper = rowSourceWrapper;
QueryParameters = _queryRequestor.QueryParameters;
// ReSharper disable PossiblyMistakenUseOfParamsMethod
_cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(queryLock.CancellationToken);
// ReSharper restore PossiblyMistakenUseOfParamsMethod
QueryLock = queryLock;
}
public void Requery()
{
using (var lastRequest = _request)
{
_request = null;
if (null == QueryParameters || null == QueryParameters.ViewInfo)
{
return;
}
RowSourceWrapper rowSourceWrapper;
if (lastRequest != null && ReferenceEquals(lastRequest.RowSourceWrapper.WrappedRowSource,
_bindingListView.RowSource))
{
rowSourceWrapper = lastRequest.RowSourceWrapper;
}
else
{
rowSourceWrapper = new RowSourceWrapper(_bindingListView.RowSource);
}
_request = new Request(this, _bindingListView.QueryLock, rowSourceWrapper);
_request.StartQuery();
}
}
public ForegroundQuery(RowSourceWrapper rowSource, IQueryRequest queryRequest)
{
RowSource = rowSource;
QueryRequest = queryRequest;
}
public BackgroundQuery(RowSourceWrapper rowSource, IQueryRequest queryRequest)
{
RowSource = rowSource;
QueryRequest = queryRequest;
_rootCancellationToken = QueryRequest.CancellationToken;
}