Who can convert this code to linq. Thank you in advance.

Question

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please comvert this code to linq. i have a problem with this in my linq code

SELECT top 15 * FROM (
    SELECT *, 
        (
            (
                (
                    acos(
                        sin((15.391861273433282 * pi() / 180))
                        *
                        sin(( X * pi() / 180)) + cos((15.391861273433282 * pi() /180 ))
                        *
                        cos(( X * pi() / 180)) * cos(((121.05844856778678 - y) * pi()/180)))
                ) * 180/pi()
            ) * 60 * 1.1515 * 1.609344
        )
    as distance FROM table
) table
WHERE distance <= 2

What I have tried:

please comvert this code to linq. i have a problem with this in my linq code

Posted 8-Jun-21 21:35pm

Member 12960626

Updated 8-Jun-21 22:35pm

v3

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Comments

Maciej Los 9-Jun-21 3:39am

Why?

Member 12960626 9-Jun-21 3:40am

i want to integrate a full linq to sql coded.

i run that code in sql server to get the location within the specific radius. it run properly. but i cant do it in c# behind the code. im using Linq

CHill60 9-Jun-21 4:04am

Fair question :laugh:

CHill60 9-Jun-21 4:04am

What have you tried in Linq and what was the problem?

Member 12960626 9-Jun-21 4:08am

DataContext phil= new DataContext();
var ss= (from x in phil.table
select new
{
distance = ((SqlFunctions.Acos(SqlFunctions.Sin((15.391861273433282 * SqlFunctions.Pi() / 180))
*
SqlFunctions.Sin((Convert.ToDouble(x.X) * SqlFunctions.Pi() / 180)) + SqlFunctions.Cos((15.391861273433282 * SqlFunctions.Pi() / 180))
*
SqlFunctions.Cos((Convert.ToDouble(x.X) * SqlFunctions.Pi() / 180)) + SqlFunctions.Cos(((121.05844856778678 - Convert.ToDouble(x.y))))
) * 180 / SqlFunctions.Pi()
) * 60 * 1.1515 * 1.609344
)
}).AsQueryable();

var getcoor = from p in ss
where p.distance <= 20
select p;

Response.Write(getcoor.ToArray());

the error is
This function can only be invoked from LINQ to Entities.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotSupportedException: This function can only be invoked from LINQ to Entities

Maciej Los 9-Jun-21 4:21am

I'd suggest to add above content to your question. Use Improve Question widget.

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Maciej Los · Answer 1 · 2021-06-08T22:35:00

I'm guessing...

Try this:

C#

using (DataContext phil= new DataContext())
{
    var ss= phil.table
        .ToList() //obligatory
        .Select(p => ((Math.Acos(
				Math.Sin((15.391861273433282 * Math.PI / 180.0))
		 		* Math.Sin(( p.X * Math.PI / 180.0)) + Math.Cos((15.391861273433282 * Math.PI /180.0 ))
	            * Math.Cos(( p.X * Math.PI / 180.0)) * Math.Cos(((121.05844856778678 - p.Y) * Math.PI/180.0)))
				* 180.0/Math.PI) * 60.0 * 1.1515 * 1.609344)
	    )
        .Where(d => d<20)
	    .ToList();

    return ss;
}

More at: Querying data via the DbSet | Learn Entity Framework Core[^]