usign LINQ to SQL in web service

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I need to return this query result from web service, how can I do that ?
notice : without looping on result data or filling another datatable.

C#

var query = from usr in BCM.Users
                    join usrgrp in BCM.UsersGroups
                    on usr.userID equals usrgrp.userID
                    where usrgrp.groupID == ID
                    select new { usr.firstName, usr.FamilyName, usr.userName,
                    usrgrp.Group.groupName, usrgrp.Group.groupDescription };

Posted 23-May-11 2:54am

M.Behery

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Kim Togo 23-May-11 9:21am

Is it "query" that you want to return as an array ?

M.Behery 23-May-11 10:37am

yes its a query but I need to return the result as a class or an serializable object.

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Christoph Keller · Accepted Answer · 2011-05-23T04:26:00

Hello,

One possible way would be that you define a data-entity which you can fill-in in your select statement:

The entity:

C#

public class UserEntity
{
    public string Firstname { get; set; }
    public string Familyname { get; set; }
    public string Username { get; set; }
    public string GroupName { get; set; }
    public string GroupDescription { get; set; }
}

The select block:

var query = from usr in BCM.Users
	join usrgrp in BCM.UsersGroups
	on usr.userID equals usrgrp.userID
	where usrgrp.groupID == ID
	select new UserEntity {
		Firstname = usr.firstName, Familyname = usr.FamilyName, Username = usr.userName,
		GroupName = usrgrp.Group.groupName, GroupDescription = usrgrp.Group.groupDescription
	};

Then you could return the value as:

return query.FirstOrDefault();

(This returns a strong-typed UserEntity object)
or

return query.ToList();

(This returns a strong-typed List<UserEntity>)

Another way would be that you directly convert the resulting anonymous object to a Xml or Json representation (depends on what you can use as output of your webservice) and returns the serialized string.

Hope this helps.

Best regards and happy coding,
Stops