//Detect and retrieve sub-query in local variable
protected override Expression VisitMember(MemberExpression node)
{
IQueryable subQuery;
if (EntityQueryUtil.CheckSubQueryInLocalVariable(node, out subQuery))
{
var newExpr = Visit(subQuery.Expression);
return(newExpr);
}
return(base.VisitMember(node));
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.ReturnsEntitySet())
{
var entType = node.Type.GetGenericArguments()[0];
var entInfo = _model.GetEntityInfo(entType, true);
_command.Info.Entities.Add(entInfo);
return(EntityQueryUtil.CreateEntitySetConstant(entType));
}
if (node.Method.DeclaringType == typeof(EntityQueryExtensions) && node.Method.Name == "Include")
{
return(Visit(node.Arguments[0])); //Include lambda was already added to Info.Includes by analyzer
}
return(base.VisitMethodCall(node));
}
private ValueKind AnalyzeMember(MemberExpression node)
{
// check if it is subquery stored in local variable; if yes, retrieve the value and convert to constant
IQueryable subQuery;
if (EntityQueryUtil.CheckSubQueryInLocalVariable(node, out subQuery))
{
AnalyzeNode(subQuery.Expression); // we need to visit it as well, to process sub-query nodes
return(ValueKind.Db);
}
//regular member access node
var exprValueKind = this.AnalyzeNode(node.Expression);
AddCacheKey(node.Member.Name);
if (node.Member.IsStaticMember())
{
return(ValueKind.Local);
}
else
{
return(exprValueKind); //same as mexp.Expression's valueKind
}
}