ServerVersion异常,无效操作。连接被关闭。解决方案

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问题在于：State Closed System.Data.ConnectionState
连接没有open().
在try中加入
if (oleDbConnection1.State != ConnectionState.Open)
    oleDbConnection1.Open();
加上
finally
{
    if (oleDbConnection1.State != ConnectionState.Close)
    {
        oleDbConnection1.Close();
    }
}

 

详见http://bbs.csdn.net/topics/90347542

 

/// <summary>
        /// 添加实体
        /// </summary>
        /// <param name="sysCompany"></param>
        /// <param name="sysUser"></param>
        public bool InsertEntities(TSysCompany sysCompany, TSysUser sysUser)
        {
            using (teaCRMDBContext db = new teaCRMDBContext())
            {
                if (db.Connection.State != ConnectionState.Open)
                {
                    db.Connection.Open();
                }
                var tran = db.Connection.BeginTransaction();
                try
                {
                    db.TSysCompanies.Insert(sysCompany);
                    db.TSysUsers.Insert(sysUser);
                    tran.Commit();
                    return true;
                }
                catch (Exception ex)
                {
                    tran.Rollback();
                    throw new Exception(ex.Message);
                    return false;

                }
                finally
                {
                    if (db.Connection.State != ConnectionState.Closed)
                    {
                        db.Connection.Close();
                    }
                }
            }
        }