Remove and add record to IQueryable LINQ

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Hey guys, I have a small issue which maybe some one can help me with.

I have an IQuerable<subscription> which I populate from a table in the database. My question is how do I add the sub to the IQuerable object i.e an Object of type Subscription to the IQueryable<subscription>? Obviously the below code is taken from different places in the application.

C#

//Declaration
IQueryable<Subscription> subscriptions;

//Populate
subscriptions = db.GetTable<Subscription>().Where(s => s.SubscriptionLinkTypeId == (byte)SubscriptionLinkType.Alarm);

 var sub = _lstOfSubscriptions.Where(         
s => s.SubscriptionLinkId == subscriptionLinkId && s.SubscriptionLinkTypeId == subscriptionLinkTypeId && s.SubscriberLinkId == subscriberLinkId && s.SubscriberLinkTypeId == subscriberLinkTypeId && s.NotificationMethodId == notificationMethodId).First();

Thanks for your help guys...

Posted 19-Aug-13 5:12am

frostcox

Updated 19-Aug-13 5:18am

v3

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Jameel VM · Accepted Answer · 2013-08-19T05:32:00

You should first convert it to List.IQueryble does not have a method for adding
//Declaration

C#

IQueryable<Subscription> subscriptions;

//Populate

C#

subscriptions = db.GetTable<Subscription>().Where(s => s.SubscriptionLinkTypeId == (byte)SubscriptionLinkType.Alarm);

 var sub = _lstOfSubscriptions.First(
s => s.SubscriptionLinkId == subscriptionLinkId && s.SubscriptionLinkTypeId == subscriptionLinkTypeId && s.SubscriberLinkId == subscriberLinkId && s.SubscriberLinkTypeId == subscriberLinkTypeId && s.NotificationMethodId == notificationMethodId);

subscriptions.ToList().Add(sub);

Don't use Where and First together.
_lstOfSubscriptions.Where.First == _lstOfSubscriptions.First()

karlodegrano · Accepted Answer · 2013-08-19T05:51:00

Easiest way is to use generic List<t></t> which implements IList.

C#

List<subscription> subscriptions;</subscription>

Then you can add the selected subs to the list.

C#

subscriptions.Add(subs);

And then you can convert it back to generic IQueryable<subscription></subscription>

C#

var newSubs = subscriptions.AsQueryable();

Remove and add record to IQueryable LINQ

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