实体框架6数据库优先-如何与ADO共享连接和事务

Question

Is it possible to share one connection (and transaction as well) between operations made in EF6 DB First approach and some ADO operations?

As I read here: https://msdn.microsoft.com/en-us/data/dn456843.aspx#existing it is possible to share connection and transactions since EF v6, but I have to pass SqlConnection object as a parameter to the constructor of context class. But if I do that in DB First approach , I've got UnintentionalCodeFirstException.

As I read here: https://msdn.microsoft.com/en-us/data/jj592674 I have to use instance of EntityConnection as a parameter to the constructor of context class when DB First approach is used. But EntityConnection class constructor accept only CLOSED connections. And therefore I cannot share transaction, because connection has to be closed before passed to context class.

Am I right and it is impossible to share one connection in this scenario, or maybe there is some other way?

Is TransactionScope still the only way to wrap operations in EF 6 DB First and ADO in a transaction (with separate connections) ?

Answer 1

I can not remember where I did get this from, but it helped me with running EF and SqlBulkCopy in same transaction. Here is how to grab transaction with reflection from Entity Framework :

EntityConnection ec = (EntityConnection)Context.Connection;
SqlConnection sc = (SqlConnection)ec.StoreConnection;
SqlTransaction sqlTransaction = null;

var parserProp = sc.GetType().GetProperty("Parser", BindingFlags.NonPublic | BindingFlags.Instance);

if (parserProp != null)
{
    var parser = parserProp.GetValue(sc, null);
    var sqltxProp = parser.GetType().GetProperty("CurrentTransaction", BindingFlags.NonPublic | BindingFlags.Instance);
    var currentTransaction = sqltxProp.GetValue(parser, null);
    sqlTransaction = currentTransaction as SqlTransaction;

    if (sqlTransaction == null)
    {
        var parentProp = currentTransaction.GetType().GetProperty("Parent", BindingFlags.NonPublic | BindingFlags.Instance);
        currentTransaction = parentProp.GetValue(currentTransaction, null);
        sqlTransaction = currentTransaction as SqlTransaction;
    }
}