Sense/net using content query in console application - sensenet

Question

I try to use content query in console application but it throw an exception "Object reference not set to an instance of an object".
Please give help me resolve that problem.
var startSettings = new RepositoryStartSettings
{
Console = Console.Out,
StartLuceneManager = false,
IsWebContext = false,
PluginsPath = AppDomain.CurrentDomain.BaseDirectory,
};
using (Repository.Start(startSettings))
{
try
{
string path = "/Root/Sites/Default_Site/workspaces/Document/HACCP/Document_Library/SanXuat/ChonLocChuanBiDiaDiemSXRau";
string fieldName1 = "Name";
var content = Content.Load(path);
int count = ContentQuery.Query(".AUTOFILTERS:OFF .COUNTONLY Infolder:" + path).Count;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}

Answer 1

if you want to execute a content query, you have to enable LuceneManager when you start the repository, because that component is responsible for querying.
new RepositoryStartSettings
{
Console = Console.Out,
StartLuceneManager = true, // <-- this is necessary
IsWebContext = false,
PluginsPath = AppDomain.CurrentDomain.BaseDirectory,
}
Please make sure that all the config values are in place (e.g. index directory path, enable outer search engine). You can copy them from the Export or Import tool's config file.
A few more notes:
in a content query please always enclose path expressions in quotes, because if there is a space in the path, it causes a query error that is hard to find (because it would return a different result set). For example:
InTree:'/Root/My Folder'
Or you can use the built-in parameter feature that makes sure the same:
// note the #0 parameter, which is a 0-based index
ContentQuery.Query("+TypeIs:Article +InTree:#0", null, containerPath);