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启动由此 SACommand 说明的 SQL 语句或存储过程的异步执行,并从数据库服务器中检索一个或多个结果集。
BeginExecuteReader() 方法BeginExecuteReader(CommandBehavior) 方法BeginExecuteReader(AsyncCallback, Object) 方法BeginExecuteReader(AsyncCallback, Object, CommandBehavior) 方法