Creating and Modifying Counters

void Increment(string counterName, long incrementValue = 1);

• Flow:

  • Open a session
  • Create an instance of CountersFor.
    • Either pass CountersFor an explicit document ID, -or-
    • Pass it an entity tracked by the session, e.g. a document object returned from session.query or from session.Load.
  • Execute CountersFor.Increment
  • Execute session.SaveChanges for the changes to take effect

• Note:

  • Modifying a Counter using Increment only takes effect when session.SaveChanges() is executed.
  • To decrease a Counter's value, pass the method a negative number to Increment.
    

// 1. Open a session
using (var session = docStore.OpenSession())
{
    // 2. pass CountersFor's constructor a document ID  
    var documentCounters = session.CountersFor("products/1-C");

    // 3. Use `CountersFor.Increment`
    documentCounters.Increment("ProductLikes"); // Increase "ProductLikes" by 1, or create it with a value of 1
    documentCounters.Increment("ProductDislikes", 1); // Increase "ProductDislikes" by 1, or create it with a value of 1
    documentCounters.Increment("ProductPageViews", 15); // Increase "ProductPageViews" by 15, or create it with a value of 15
    documentCounters.Increment("DaysLeftForSale", -10); // Decrease "DaysLeftForSale" by 10, or create it with a value of -10

    // 4. Save changes to the session
    session.SaveChanges();
}