Insert entity to MongoDb async not working

Question

could somebody tell me why this code not working ? It compiles, it runs but the Mongo database is still empty. It is working when doing it synchronously.

class Program
{
    static void Main(string[] args)
    {
        var client = new MongoClient();
        var db = client.GetDatabase("Mongo");
        var collection = db.GetCollection<User>("Users");

        User user = new User("Denis", "Chang", "China", 21);
        AddUserAsync(user, collection);
    }

    static async void AddUserAsync(User user, IMongoCollection<User> collection)
    {
        await collection.InsertOneAsync(user);
    }
}

Kirk Larkin · Accepted Answer · 2018-10-10 14:57:53Z

2

You're not waiting for AddUserAsync to complete. In order to do so, you have a couple of options:

Use AddUserAsync(user, collection).GetAwaiter().GetResult(), which will block until the asynchronous function completes.

If you're using C# 7.1, you can use an async Main, like so:

static async Task Main()
{
    ...
    await AddUserAsync(user, collection);
}

In order for either of these approaches to work, you'll also need to update your AddUserAsync function to return a Task, simply by changing the signature:

static async Task AddUserAsync(User user, IMongoCollection<User> collection)

answered Oct 10, 2018 at 14:57

Kirk Larkin

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1 Comment

Kirk Larkin Over a year ago

Stephen Cleary wrote an excellent article on this stuff, which you might find interesting.

smolchanovsky · Accepted Answer · 2018-10-10 14:57:53Z

0

The method is asynchronous but you do not wait for the completion of the operation. Try this

static async Task AddUserAsync(User user, IMongoCollection<User> collection)
{
    await collection.InsertOneAsync(user);
}

and then

AddUserAsync(user, collection).Wait();

edited Oct 10, 2018 at 14:57

answered Oct 10, 2018 at 14:52

smolchanovsky

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1 Comment

john.kernel Over a year ago

Settings are correct.It is working when doing it synchronously.

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