public static IIncludeQuery <TEntity, TNewProperty> Include <TEntity, TPreviousProperty, TNewProperty>(
this IIncludeQuery <TEntity, TPreviousProperty> query,
Expression <Func <TEntity, TNewProperty> > selector)
{
query.Visitor.Visit(selector);
var includeQuery = new IncludeQuery <TEntity, TNewProperty>(query.PathMap);
query.PathMap[includeQuery] = query.Visitor.Path;
return(includeQuery);
}
public IncludeQuery <TEntity, TProperty> Include <TProperty>(Expression <Func <TEntity, TProperty> > selector)
{
var visitor = new IncludeVisitor();
visitor.Visit(selector);
var pathMap = new Dictionary <IIncludeQuery, string>();
var query = new IncludeQuery <TEntity, TProperty>(pathMap);
if (!string.IsNullOrEmpty(visitor.Path))
{
pathMap[query] = visitor.Path;
}
return(query);
}
public static IIncludeQuery <TEntity, TNewProperty> ThenInclude <TEntity, TPreviousProperty, TNewProperty>(
this IIncludeQuery <TEntity, IEnumerable <TPreviousProperty> > query,
Expression <Func <TPreviousProperty, TNewProperty> > selector)
{
query.Visitor.Visit(selector);
// If the visitor did not generate a path, return a new IncludeQuery with an unmodified PathMap.
if (string.IsNullOrEmpty(query.Visitor.Path))
{
return(new IncludeQuery <TEntity, TNewProperty>(query.PathMap));
}
var pathMap = query.PathMap;
var existingPath = pathMap[query];
pathMap.Remove(query);
var includeQuery = new IncludeQuery <TEntity, TNewProperty>(query.PathMap);
pathMap[includeQuery] = $"{existingPath}.{query.Visitor.Path}";
return(includeQuery);
}