public AsyncTypeAwaitable FirstOrDefaultAsync(QueryAdapterBase queryAdapter, IQueryable source, CancellationToken cancellation)
{
if (source is not IQueryable <T> typedQueryable)
{
typedQueryable = source.Cast <T>();
}
var task = queryAdapter.FirstOrDefaultAsync(typedQueryable, cancellation);
return(task.AsTypeAwaitable());
}
public AsyncTypeAwaitable FirstOrDefaultAsync(
QueryAdapterBase queryAdapter,
IQueryable source,
Expression predicate,
CancellationToken cancellation)
{
if (source is not IQueryable <T> typedQueryable)
{
typedQueryable = source.Cast <T>();
}
if (predicate is UnaryExpression unaryExpression && unaryExpression.NodeType == ExpressionType.Quote)
{
predicate = unaryExpression.Operand;
}
// TODO: Can we convert the selector if it is not of the appropriate type?
var task = queryAdapter.FirstOrDefaultAsync(typedQueryable, (Expression <Func <T, bool> >)predicate, cancellation);
return(task.AsTypeAwaitable());
}