How to update and upsert multiple documents in MongoDB using C# Drivers

Question

I am using MongoDB 2, and I want to update multiple documents and upsert a value like processed:true into the collection. But MongoDB c# api only allows us to

Answer 1

After Mongo 2.6 you can do Bulk Updates/Upserts. Example below does bulk update using c# driver.

MongoCollection collection = database.GetCollection(collectionName);
      var bulk = collection.InitializeUnorderedBulkOperation();
      foreach (FooDoc fooDoc in fooDocsList)
      {
        var update = new UpdateDocument { {fooDoc.ToBsonDocument() } };
        bulk.Find(Query.EQ("_id", fooDoc.Id)).Upsert().UpdateOne(update);
      }
      BulkWriteResult bwr =  bulk.Execute();