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How can I make an asynchronous insert/update to MongoDB in C#? What is the terminology for lazy-persistence?

  • write-behind
shA.t
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Serhat Dincel
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2 Answers2

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MongoDB inserts are by default kind of asynchronous since it's fire-and-forget. The error check is an explicit operation or you have to enable the safe mode on the driver level. If you need true asynchronous operations: use a message queue.

  • Not sure that *"inserts are by default kind of asynchronous"* was true as of the time this answer was written. According to this [official blog post](https://www.mongodb.com/blog/post/introducing-20-net-driver) from 2015, async operations were introduced only in the 2.0 driver version, which was followed by SO questions such as [this one](https://stackoverflow.com/questions/30091922/understanding-the-changes-in-mongodb-new-c-sharp-driver-async-and-await). – OfirD Oct 02 '19 at 09:25
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In caching world 'lazy-persistence' would be called write-behind. Check this out: Cache/Wikipedia

Probably the easiest way is to use the C# async method calls. This will tell you how:

The code would look something like:

  • define your own delegate:

        private delegate void InsertDelegate(BsonDocument doc);

  • use it

        MongoCollection<BsonDocument> books = database.GetCollection<BsonDocument>("books");
    BsonDocument book = new BsonDocument {
        { "author", "Ernest Hemingway" },
        { "title", "For Whom the Bell Tolls" }
    };

    var insert = new InsertDelegate(books.Insert);

    // invoke the method asynchronously
    IAsyncResult result = insert.BeginInvoke(book, null, null);

    //  DO YOUR OWN WORK HERE

    // get the result of that asynchronous operation
    insert.EndInvoke(result);

Hope that helps.

grzeg
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