last record in LINQ

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Hi All

How can i retrieve the last record from database using LINQ method? And how a handle the error if the LINQ table has no records?

Posted 7-Dec-10 22:02pm

Starlene

Updated 7-Dec-10 22:40pm

TweakBird

v2

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3 solutions

Solution 2

For last record :

1. See This[^] (the answer is below the advertisements at this link, you will have to scroll a lot).

2. See This[^]

To handle the error, if table has no records:

Its just on the top of my head, i cant check it at present, so syntax error may be there:

C#

if(tablename.Records.Count >0) //something like this will do
    {
         //write your code
    }

OR

See this[^]

BTW, some googling by you may have saved your and mine lots of time.
(Please accept answer or provide votes if I was helpful)

Anurag

Posted 7-Dec-10 22:53pm

@nuraGGupta@

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Simon P Stevens 8-Dec-10 8:02am

Your first link doesn't have any answers - Experts exchange only displays answers for free when the referrer is google.

@nuraGGupta@ 15-Dec-10 2:14am

Yes, i noticed that later on. Apologies for not considering it.

Solution 3

DBs are technically unordered (OK records pretty much come out in the order they went in, but this isn't guaranteed) so if you need a specific order, you must add some way to do this (identity column [e.g. on an integer surrogate key], a custom ordering column, date column etc).
If you do this, you just need the linq to get the record containing the Max value for your ordering column: How to: Find the Maximum Value in a Numeric Sequence
[^].
Note that there should not be any errors if you have no records: the list of entries will merely be empty, unless you call Single(), in which case SingleOrDefault() will be better, and check for "default"

Posted 7-Dec-10 23:01pm

Keith Barrow

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Simon P Stevens · Accepted Answer · 2010-12-07T22:52:00

Just call Last()[^]:

var lastItem = yourQuery.Last()

If you think there is a chance your table may be empty, use LastOrDefault()[^] instead. This will return null if nothing is found.

var lastItem = yourQuery.LastOrDefault();
if(lastItem == null)
{
    //Table was empty.
}

Obviously, if your query isn't actually ordered by anything, then the "last" item could be anything.