private Expression Filter(Expression visited, Expression processed)
{
if (this.filter == null)
{
this.filter = this.context.QueryContext.GetHookHandler <IQueryExpressionFilter>();
}
if (this.filter != null)
{
var filtered = filter.Filter(this.context);
var callback = this.context.AfterNestedVisitCallback;
this.context.AfterNestedVisitCallback = null;
if (filtered != null && filtered != visited)
{
if (!visited.Type.IsAssignableFrom(filtered.Type))
{
throw new InvalidOperationException(
Resources.FilterCannotChangeExpressionType);
}
this.processedExpressions.Add(visited, processed);
this.context.PushVisitedNode(null);
try
{
processed = this.Visit(filtered);
}
finally
{
this.context.PopVisitedNode();
this.processedExpressions.Remove(visited);
}
if (callback != null)
{
callback();
}
}
}
return(processed);
}
private Expression Filter(Expression visited, Expression processed)
{
if (this.filter == null)
{
this.filter = this.context.QueryContext.GetHookHandler<IQueryExpressionFilter>();
}
if (this.filter != null)
{
var filtered = filter.Filter(this.context);
var callback = this.context.AfterNestedVisitCallback;
this.context.AfterNestedVisitCallback = null;
if (filtered != null && filtered != visited)
{
if (!visited.Type.IsAssignableFrom(filtered.Type))
{
throw new InvalidOperationException(
Resources.FilterCannotChangeExpressionType);
}
this.processedExpressions.Add(visited, processed);
this.context.PushVisitedNode(null);
try
{
processed = this.Visit(filtered);
}
finally
{
this.context.PopVisitedNode();
this.processedExpressions.Remove(visited);
}
if (callback != null)
{
callback();
}
}
}
return processed;
}
