有没有一种方法可以查询主线程领域实例而不阻塞主线程？

Question

realm-dotnet

I'd like to pass some main-thread realm objects to some view-models, but don't want to block the UI while I retrieve them.

I need realm objects from a main-thread realm instance so that myRealmObject.PropertyChanged is called on the main thread. If no background query, is there a way to make a background-thread realm object's PropertyChanged be called on the main thread?

Answer 1

You can query on a background thread and create a ThreadSafeReference that you can pass to your VMs. For example:

var reference = await Task.Run(() =>
{
    using (var realm = Realm.GetInstance())
    {
        var modelToPass = realm.All<MyModel>().Where(...).FirstOrDefault();
        return ThreadSafeReference.Create(modelToPass);
    }
});
// Pass reference to your ViewModel

Then in your ViewModel you can have

public void Initialize(ThreadSafeReference.Object<MyModel> reference)
{
    var realm = Realm.GetInstance();
    var myModel = realm.ResolveReference(reference);
    // Do stuff with myModel - it's a main thread reference to
    // the model you resolved on the background thread
}

Check out the docs for more detailed explanation.