private Expression Expand(Expression visited)
{
if (expander == null)
{
return(visited);
}
var expanded = expander.Expand(context);
var callback = context.AfterNestedVisitCallback;
context.AfterNestedVisitCallback = null;
if (expanded != null && expanded != visited)
{
if (!visited.Type.IsAssignableFrom(expanded.Type))
{
throw new InvalidOperationException(Resources.ExpanderCannotChangeExpressionType);
}
context.PushVisitedNode(null);
expanded = Visit(expanded);
context.PopVisitedNode();
if (callback != null)
{
callback();
}
return(expanded);
}
return(visited);
}
private Expression Expand(Expression visited)
{
if (this.expander == null)
{
this.expander = this.context.QueryContext
.GetApiService <IQueryExpressionExpander>();
}
if (expander == null)
{
return(visited);
}
var expanded = expander.Expand(this.context);
var callback = this.context.AfterNestedVisitCallback;
this.context.AfterNestedVisitCallback = null;
if (expanded != null && expanded != visited)
{
if (!visited.Type.IsAssignableFrom(expanded.Type))
{
throw new InvalidOperationException(
Resources.ExpanderCannotChangeExpressionType);
}
this.context.PushVisitedNode(null);
expanded = this.Visit(expanded);
this.context.PopVisitedNode();
if (callback != null)
{
callback();
}
return(expanded);
}
return(visited);
}