SqlBulkCopy from a List<>

Question

How can I make a big insertion with SqlBulkCopy from a List<> of simple object ?

Do I implement my custom IDataReader ?

Answer 1

Late to the party, but if you add this EntityDataReader class from Microsoft, there's an AsDataReader() extension method that does exactly that: https://github.com/matthewschrager/Repository/blob/master/Repository.EntityFramework/EntityDataReader.cs

(example [List].AsDataReader() implementation:)

var connStr = "";
using (var connection = new SqlConnection(connStr)) 
{
    var startTime = DateTime.Now;
    connection.Open();
    var transaction = connection.BeginTransaction();
    try
    {
        //var connStr = connection.ConnectionString;
        using (var sbCopy = new SqlBulkCopy(connection, SqlBulkCopyOptions.Default, transaction))
        {
            sbCopy.BulkCopyTimeout = 0;
            sbCopy.BatchSize = 10000;
            sbCopy.DestinationTableName = "Foobars";
            var reader = Foobars.AsDataReader();
            sbCopy.WriteToServer(reader);
        }
        transaction.Commit();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        transaction.Rollback();
    }
    finally
    {
        transaction.Dispose();
        connection.Close();
        var endTime = DateTime.Now;
        Console.WriteLine("Upload time elapsed: {0} seconds", (endTime - startTime).TotalSeconds);
    }
}