Docs Menu
Docs Home
/
MongoDB Atlas
/
Atlas Device SDKs
/
.NET SDK
/
CRUD

Create Data - .NET SDK

On this page

  • Create a Realm Object
  • Upsert a Realm Object

Create a Realm Object

When creating or updating documents, all writes must happen in a transaction.

The following code shows two methods for creating a new Realm object. In the first example, we create the object first, and then add it to the realm within a WriteAsync() method. In the second example, we create the document within the WriteAsync block, which returns a realm object we can further work with.

var testItem = new Item
{
    Name = "Do this thing",
    Status = ItemStatus.Open.ToString(),
    Assignee = "Aimee"
};
await realm.WriteAsync(() =>
{
    realm.Add(testItem);
});
// Or 
var testItem2 =
    await realm.WriteAsync(() =>
    {
        return realm.Add<Item>(new Item
        {
            Name = "Do this thing, too",
            Status = ItemStatus.InProgress.ToString(),
            Assignee = "Satya"
        });
    }
);

Upsert a Realm Object

Upserting a document is the same as creating a new one, except you set the optional update parameter to true. In this example, we create a new Item object with a unique Id. We then insert an item with the same id but a different Name value. Because we have set the update parameter to true, the existing record is updated with the new name.

var id = ObjectId.GenerateNewId();
var item1 = new Item
{
    Id = id,
    Name = "Defibrillate the Master Oscillator",
    Assignee = "Aimee"
};
// Add a new person to the realm. Since nobody with the existing Id
// has been added yet, this person is added.
await realm.WriteAsync(() =>
{
    realm.Add(item1, update: true);
});
var item2 = new Item
{
    Id = id,
    Name = "Fluxify the Turbo Encabulator",
    Assignee = "Aimee"
};
// Based on the unique Id field, we have an existing person,
// but with a different name. When `update` is true, you overwrite
// the original entry.
await realm.WriteAsync(() =>
{
    realm.Add(item2, update: true);
});
// item1 now has a Name of "Fluxify the Turbo Encabulator"
// and item2 was not added as a new Item in the collection.

Back

CRUD

Next

Read

On this page