[Question] Remote Linq sync to async

Got this synchronous code working perfectly in a Blazor server app:

    public static IQueryable<T> Create<T>(IClientSession session, ListType? mainListType = null, int? subTypeID = null)
    {
      return RemoteQueryable.Factory.CreateQueryable<T>(
        expression =>
        {
          return session.Execute(new GetExpressionResult(expression, typeof(T), mainListType, subTypeID))?.Result ?? new List<T>();
        },
        null,
        new BasicResultMapper(),
        null);
    }

I’m calling this sync code similar to this:

Helper.Create<MyDto>(ClientSession).Where(x => x.ForType == ItemType.Orders).OrderBy(x => x.Name).Take(25).ToList();

However can’t get this working async using Remote.Linq.

I can have it working by using Task, but that doesn’t feel 100% correct:

    public static IQueryable<T> Create<T>(IClientSession session, ListType? mainListType = null, int? subTypeID = null)
    {
      return RemoteQueryable.Factory.CreateQueryable<T>(
        expression =>
        {
          return session.Execute(new GetExpressionResult(expression, typeof(T), mainListType, subTypeID))?.Result ?? new List<T>();
        },
        null,
        new BasicResultMapper(),
        null);
    }

public static async Task<IQueryable<T>> CreateAsync<T>(IClientSession session, ListType? mainListType = null, int? subTypeID = null)
        {
            return await Task.Run(() =>
            {
                return Create<T>(session, mainListType, subTypeID);
            });
        }

Another attempt, but this deadlocks or doesn’t seem to work property in production:

public static async Task<IQueryable<T>> CreateAsync<T>(IClientSession session, ListType? mainListType = null, int? subTypeID = null)
        {
            return RemoteQueryable.Factory.CreateAsyncQueryable<T>(
              async expression =>
              {
                  return (await session.ExecuteAsync(new GetExpressionResult(expression, typeof(T), mainListType, subTypeID)))?.Result ?? new List<T>();
              },
              null,
              new BasicResultMapper(),
              null);
        }

Another attempt, but one that doesn’t build (complains about return type should be void, Task, Task<T>, IAsyncEnumerable<T>, … CS1983 and lacks await CS1998):

        public static async System.Linq.IAsyncQueryable<T> CreateAsync<T>(IClientSession session, ListType? mainListType = null, int? subTypeID = null)
        {
            return RemoteQueryable.Factory.CreateAsyncQueryable<T>(
              async expression =>
              {
                return (await session.ExecuteAsync(new GetExpressionResult(expression, typeof(T), mainListType, subTypeID)))?.Result ?? new List<T>();
              },
              null,
              new BasicResultMapper(),
              null);
        }

How can this sync method be written correctly async using your library?

[6bee]

Synchronous linq functions should actually work too. Please note that by adding namespace using Remote.Linq.Async; you get a set of async linq functions as well.

Have you already checked-out the sample/demo apps (Remote.Linq.Samples.sln)? There are a few showing how to work async.

[6bee]

This issue is closed due to inactivity. Feel free to re-open if needed.