EF6拦截SQL并记录到db outofmemoryException

我正在尝试将记录到表中的SQL记录到日志中,但收到OutofMemoryException。我知道为什么会有例外,但我不知道如何避免。

应用程序上下文:

public class ApplicationDbContext : IdentityDbContext<ApplicationUser> {   
    public ApplicationDbContext() :
            base("IdentityDBContext", false) {
        DbInterception.Add(new InsertUpdateInterceptor());
    }
}

Web数据实体:

   public WebDataEntities()
            : base("name=WebDataEntities")
        {
        }

日志类:

 public class InsertUpdateInterceptor : IDbCommandInterceptor {
        public virtual void NonQueryExecuting(
            DbCommand command, DbCommandInterceptionContext<int> interceptionContext) {
            logCommand(command);
        }

        public virtual void ReaderExecuting(
            DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext) {
            // this will capture all SELECT queries if you care about them..
            // however it also captures INSERT statements as well 
            logCommand(command);
        }

        public virtual void ScalarExecuting(
         DbCommand command, DbCommandInterceptionContext<object> interceptionContext) {
            logCommand(command);
        }


        private void logCommand(DbCommand dbCommand) {
            StringBuilder commandText = new StringBuilder();

            commandText.AppendLine("-- New statement generated: " + System.DateTime.Now.ToString());
            commandText.AppendLine();

            // as the command has a bunch of parameters, we need to declare
            // those parameters here so the SQL will execute properly

            foreach (DbParameter param in dbCommand.Parameters) {
                var sqlParam = (SqlParameter)param;

                commandText.AppendLine(String.Format("DECLARE {0} {1} {2}",
                                                        sqlParam.ParameterName,
                                                        sqlParam.SqlDbType.ToString().ToLower(),
                                                        getSqlDataTypeSize(sqlParam)));

                var escapedValue = sqlParam.SqlValue.ToString().Replace("'", "''");
                commandText.AppendLine(String.Format("SET {0} = '{1}'", sqlParam.ParameterName, escapedValue));
                commandText.AppendLine();
            }

            commandText.AppendLine(dbCommand.CommandText);
            commandText.AppendLine("GO");
            commandText.AppendLine();
            commandText.AppendLine();

            using(var context = new WebDataEntities()) {
                context.tbl_FSV_AspNetIdentity_SQL_Log.Add(new tbl_FSV_AspNetIdentity_SQL_Log { Sql = commandText.ToString() });
                context.SaveChanges();
            }

            //System.IO.File.AppendAllText("outputfile.sql", commandText.ToString());
        }

        private string getSqlDataTypeSize(SqlParameter param) {
            if (param.Size == 0) {
                return "";
            }

            if (param.Size == -1) {
                return "(MAX)";
            }

            return "(" + param.Size + ")";
        }


        // To implement the IDbCommandInterceptor interface you need to also implement these methods like so

        public void NonQueryExecuted(
            DbCommand command, DbCommandInterceptionContext<int> interceptionContext) {
        }

        public void ReaderExecuted(
            DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext) {
        }

        public void ScalarExecuted(
            DbCommand command, DbCommandInterceptionContext<object> interceptionContext) {
        }
    }

我收到这个异常是因为当我试图记录SQL时,它会陷入一个循环,试图记录应该记录SQL到数据库的SQL。但我使用了两种不同的上下文,所以为什么它要尝试将SQL记录两次?