public QueryRequestor(BindingListView bindingListView)
{
_bindingListView = bindingListView;
// ReSharper disable once PossiblyMistakenUseOfParamsMethod
_cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(bindingListView.CancellationToken);
_queryParameters = QueryParameters.Empty;
_rowSourceWrapper = RowSourceWrapper.Empty;
}
public void SetRowsAndParameters(IEnumerable rowSource, QueryParameters queryParameters)
{
if (ReferenceEquals(RowSource, rowSource) && Equals(QueryParameters, queryParameters))
{
return;
}
_rowSourceWrapper = WrapRowSource(rowSource);
_queryParameters = queryParameters;
Requery();
}
public QueryResults SetParameters(QueryParameters newParameters)
{
var result = new QueryResults
{
Parameters = newParameters
};
if (Parameters.PivotValid(result.Parameters))
{
result.PivotedRows = PivotedRows;
result.ItemProperties = ItemProperties;
if (Parameters.FilterValid(newParameters))
{
result.FilteredRows = FilteredRows;
if (Parameters.SortValid(newParameters))
{
result.SortedRows = SortedRows;
}
else
{
result.SortedRows = null;
}
}
else
{
result.FilteredRows = result.SortedRows = null;
}
}
else
{
if (result.Parameters.ViewInfo == null)
{
result.SortedRows = result.FilteredRows = result.PivotedRows = Empty.ResultRows;
}
else
{
result.SortedRows = result.FilteredRows = result.PivotedRows = null;
}
result.ItemProperties = null;
}
return result;
}
public void Dispose()
{
_cancellationTokenSource.Cancel();
_queryParameters = null;
_rowSourceWrapper = null;
_request = null;
}
public bool PivotValid(QueryParameters that)
{
return ReferenceEquals(ViewInfo, that.ViewInfo);
}
public bool FilterValid(QueryParameters that)
{
return PivotValid(that) && Equals(RowFilter, that.RowFilter);
}
public QueryParameters(QueryParameters that)
{
ViewInfo = that.ViewInfo;
RowFilter = that.RowFilter;
SortDescriptions = that.SortDescriptions;
}
public bool SortValid(QueryParameters that)
{
return FilterValid(that) && Equals(SortDescriptions, that.SortDescriptions);
}