问题描述

运行实体框架的种子方法时出现以下异常.我只得到一次异常，如果我在数据库已经更改时第二次运行种子方法，代码就可以工作.我该怎么做才能在第一次创建数据库时不必运行两次代码?我不想使用种子，也不想使用自定义迁移来更改数据库.

I get the following exception when running the seed method for Entity Framework. I only get the exception once, if I run the seed method a second time when the database has already been altered the code works. What can I do so that I don't have to run the code twice when creating the database the first time? I wan't to use seed and not alter the database using a custom migration.

SqlException:重置连接会导致不同的状态比初始登录.登录失败.用户 '' 登录失败.无法继续执行，因为会话处于终止状态状态.

SqlException: Resetting the connection results in a different state than the initial login. The login fails. Login failed for user ''. Cannot continue the execution because the session is in the kill state.

protected override void Seed(Repositories.EntityFramework.ApplicationDbContext context)
{
    context.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction, 
        string.Format("ALTER DATABASE [{0}] COLLATE Latin1_General_100_CI_AS", context.Database.Connection.Database));

    //Exception here
    context.Roles.AddOrUpdate(
           role => role.Name,
           new ApplicationRole() { Name = RoleConstants.SystemAdministrator }
    );
}

如果我不使用 TransactionalBehavior.DoNotEnsureTransaction 我会在 context.Database.ExecuteSqlCommand

If I don't use TransactionalBehavior.DoNotEnsureTransaction I get the exception on context.Database.ExecuteSqlCommand

多语句中不允许使用 ALTER DATABASE 语句交易.

ALTER DATABASE statement not allowed within multi-statement transaction.

推荐答案

您可以通过使用普通的 ADO.Net 连接来解决此问题，因此不会重置上下文的连接:

You can fix this issue by using a plain ADO.Net connection, so the context's connection won't be reset:

using (var conn = new SqlConnection(context.Database.Connection.ConnectionString))
{
    using (var cmd = conn.CreateCommand())
    {
        cmd.CommandText = 
            string.Format("ALTER DATABASE [{0}] COLLATE Latin1_General_100_CI_AS",
                context.Database.Connection.Database));
        conn.Open();
        cmd.ExecuteNonQuery();
    }
}

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