Sense/net using content query in web application - sensenet

Question

I try to use content query in web application but it throw an exception " Lucene.Net.Store.AlreadyClosedException: this IndexReader is closed". Please give help me resolve that problem.
var startSettings = new RepositoryStartSettings
{
Console = Console.Out,
StartLuceneManager = true, // <-- this is necessary
IsWebContext = false,
PluginsPath = AppDomain.CurrentDomain.BaseDirectory,
};
using (Repository.Start(startSettings))
{
var resultQuery = ContentQuery.Query("+InTree:#0 + DisplayName:*#1*", null, folderPath, q);
}

Answer 1

The recommended way to connect to Sense/Net from a different application (app domain) is through the REST API. It is much easier to maintain and involves less configuration (the only exception is where you are working inside the Sense/Net application itself, or you only have a single application and you do not want to access Sense/Net from anywhere else, and you are willing to deal with a local index of Sense/Net and all the config values it needs, etc).
Connecting through the REST API does not mean you have to send HTTP requests manually (although that is also not complicated at all): there is a .Net client library which does that for you. You can access all content metadata or binaries through the client, you can upload files, query content, manage permissions, etc.
// loading a content
dynamic content = await Content.LoadAsync(id);
DateTime date = content.BirthDate;
// querying
var results = await Content.QueryAsync(queryText);
Install: https://www.nuget.org/packages/SenseNet.Client
Source and examples: https://github.com/SenseNet/sn-client-dotnet
To use it in a web application, you have to do the following:
initialize the client context once, at the beginning of the application life cycle (e.g. app start)
if you need to make requests to Sense/Net in the name of the currently logged in user (e.g. because you want to query for documents accessible by her), than you have to create a new ServerContext object for every user with the username/password of that user, and provide this object to any client call (e.g. load or save content methods).
var sc = new ServerContext
{
Url = "http://example.com",
Username = "user1",
Password = "asdf"
};
var content = await Content.LoadAsync(id, sc);