Marten

Loading Documents by Id

Documents can be loaded by id from the IQuerySession interface (and so also IDocumentSession), either one at a time or by an enumerable of id values. The load by id functionality supports GUIDs, integers, long integers, and strings. If the document cannot be found, null is returned.

Synchronous Loading 

public void LoadById(IDocumentSession session)
{
    var userId = Guid.NewGuid();

    // Load a single document identified by a Guid
    var user = session.Load<User>(userId);

    // There's an overload of Load for integers and longs
    var doc = session.Load<IntDoc>(15);

    // Another overload for documents identified by strings
    var doc2 = session.Load<StringDoc>("Hank");

    // Load multiple documents by a group of id's
    var users = session.LoadMany<User>(Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid());

    var ids = new Guid[] { Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid() };

    // If you already have an array of id values
    var users2 = session.LoadMany<User>(ids);
}

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Asynchronous Loading 

public async Task LoadByIdAsync(IQuerySession session, CancellationToken token = default (CancellationToken))
{
    var userId = Guid.NewGuid();

    // Load a single document identified by a Guid
    var user = await session.LoadAsync<User>(userId, token);

    // There's an overload of Load for integers and longs
    var doc = await session.LoadAsync<IntDoc>(15, token);

    // Another overload for documents identified by strings
    var doc2 = await session.LoadAsync<StringDoc>("Hank", token);

    // Load multiple documents by a group of ids
    var users = await session.LoadManyAsync<User>(token, Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid());

    var ids = new Guid[] { Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid() };

    // If you already have an array of id values
    var users2 = await session.LoadManyAsync<User>(token, ids);
}

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