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

For those using version 2.0 of the MongoDB.Driver, you can make use of the BulkWriteAsync method.

// our example list
List products = GetProductsFromSomewhere();  

var collection = YourDatabase.GetCollection("products"); 

// initialise write model to hold list of our upsert tasks
var models = new WriteModel[products.Count];

// use ReplaceOneModel with property IsUpsert set to true to upsert whole documents
for (var i = 0; i < products.Count; i++){
    var bsonDoc = products[i].ToBsonDocument();
    models[i] = new ReplaceOneModel(new BsonDocument("aw_product_id", products[i].aw_product_id), bsonDoc) { IsUpsert = true };
};

await collection.BulkWriteAsync(models);