Convert Linq Query Result to Dictionary

Question

Hi, I want to add some rows to a database using Linq to SQL, but I want to make a "custom check" before adding the rows to know if I must add, replace or ignore the incomming rows. I'd like to keep the trafic between the client and the DB server as low as possible and minimize the number of queries.

To do this, I want to fetch as little information as required for the validation, and only once at the beginning of the process.

I was thinking of doing something like this, but obviously, it doesn't work. Anyone have an idea?

Dictionary<int, DateTime> existingItems = 
    (from ObjType ot in TableObj
        select (new KeyValuePair<int, DateTime>(ot.Key, ot.TimeStamp))
    )

What I'd like to have at the end would be a Dictionary, without having to download the whole ObjectType objects from TableObject.

I also taught about the following code, but I was trying to find a proper way :

List<int> keys = (from ObjType ot in TableObj orderby ot.Key select ot.Key).ToList<int>();
List<DateTime> values = (from ObjType ot in TableObj orderby ot.Key select ot.Value).ToList<int>();
Dictionary<int, DateTime> existingItems = new Dictionary<int, DateTime>(keys.Count);
for (int i = 0; i < keys.Count; i++)
{
    existingItems.Add(keys[i], values[i]);
}

Answer 1

Try the following

Dictionary<int, DateTime> existingItems = 
    (from ObjType ot in TableObj).ToDictionary(x => x.Key);

Or the fully fledged type inferenced version

var existingItems = TableObj.ToDictionary(x => x.Key);

Answer 2

Looking at your example, I think this is what you want:

var dict = TableObj.ToDictionary(t => t.Key, t=> t.TimeStamp);

Answer 3

Since @Talljoe hasn't added his answer from the comment thread, I'm putting it in here so that people can clearly see what solved @Tipx's problem. @Talljoe -- comment here if you do post your answer and I'll delete this one.

var dict = TableObj.Select( t => new { t.Key, t.TimeStamp } )
                   .ToDictionary( t => t.Key, t => t.TimeStamp );