Insert list<T> entity framework and check duplicates

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Hello,
Please how do I insert multiple rows using entity framework and check for duplicates and remove them into another table?'

i want to do DBContext.AddRange(List<t>) and push the duplicates into another table.
Thank you.

What I have tried:

dbSet.AddRange(bindingModel);
     var result = await _Context.SaveChangesAsync();

Posted 3-Aug-20 11:18am

Enobong Adahada

Updated 3-Aug-20 21:13pm

BillWoodruff

v2

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BillWoodruff 3-Aug-20 18:34pm

Hi, Do you mean you want to create another Table to hold duplicates ?

Afzaal Ahmad Zeeshan 3-Aug-20 21:35pm

Normally, Entity Framework should be able to check for a duplicate based on the primary key.

But, if you do not have the primary keys and you want to "INSERT" the records but ignore the duplicates, then the first query which records are available.

I would recommend using a stored procedure to improve performance.

Enobong Adahada 6-Aug-20 11:37am

Yes, I have Primary key and yes I want to put the duplicates in a separate table nd save only the duplicate free records

Enobong Adahada 6-Aug-20 11:38am

Yes, I have Primary key and yes I want to put the duplicates in a separate table and save only the duplicate free records

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Sandesh M Patil · Answer 1 · 2020-08-03T21:13:00

Solution 1

You can find duplicate values by using following

List<String> duplicates = lst.GroupBy(x => x)
                             .Where(g => g.Count() > 1)
                             .Select(g => g.Key)
                             .ToList();

Posted 3-Aug-20 21:13pm

Sandesh M Patil

Comments

Enobong Adahada 6-Aug-20 11:42am

Thus will slow down things as my table is quite large, about 15million records.