EF Core FromSqlRaw not executing stored procedure - entity-framework-core

Question

I am using EF Core Version 3.1.9.
The code shown here is to execute a stored procedure - but it does not seem to work:
var test1 = "abc";
var test2 = "xyz";
EmpResponse emp = await _context.Emp
.FromSqlRaw("EXECUTE EMPS..sel_keys #param1 = 20000, #param2 = {0}, #param3 = {1}", test1, test2)
.FirstOrDefaultAsync();
I get this error:
FromSqlRaw or FromSqlInterpolated was called with non-composable SQL and with a query composing over it.
Consider calling AsEnumerable after the FromSqlRaw or FromSqlInterpolated method to perform the composition on the client side.
I found the below document and it suggest to modify using AsEnumerable().FirstOrDefault()
https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.x/breaking-changes#fromsql
But since I am using await, the above suggestion does not work.
Could someone suggest how to do it with await?

Answer 1

The simplest is to await a call to ToListAsync() and then apply {First|Single|Last}{OrDefault}, e.g.
var emp = (await _context.Emp
.FromSqlRaw("EXECUTE EMPS..sel_keys #param1 = 20000, #param2 = {0}, #param3 = {1}", test1, test2)
.ToListAsync())
.FirstOrDefault();
In general they (EF Core designers) are expecting you to just insert AsAsyncEnumerable()
var emp = await _context.Emp
.FromSqlRaw("EXECUTE EMPS..sel_keys #param1 = 20000, #param2 = {0}, #param3 = {1}", test1, test2)
.AsAsyncEnumerable() // <--
.FirstOrDefaultAsync();
but that first requires installing additionally System.Linq.Async package, and second - once you do that, you start getting a lot of ambiguous call compile-time errors when you access DbSets in queries, because they implement both IQueryable<T> and IAsyncEnumerable<T>.
So you'd better stay with the first solution until this gets resolved (I think it would be in EF Core 6).