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When to use ref and when it is not necessary in C#

...mean it's good. It would have been better if rather than if (int.TryParse("123", out var theInt) { /* use theInt */ } we had var candidate = int.TrialParse("123"); if (candidate.Parsed) { /* do something with candidate.Value */ } It is more code, but is much more consistent with the C# language desi...
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整合phpcms v9和discuz X3.2实现同步登陆、退出免激活 - 更多技术 - 清泛网...

...程《phpcms_v9与ucenter整合屏幕录制资料》,介绍了详细的操作步骤,简单易懂。 原理:phpcms中的phpsso类似于康盛的ucenter软件,也是一个整合多系统同步通信的解决方案,不过这里以ucenter为主(服务端),phpsso为辅助(客户端...
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Hide options in a select list using jQuery

...Nov 17 '10 at 13:17 enthusiastic123enthusiastic123 14111 silver badge33 bronze badges ...
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How to make connection to Postgres via Node.js

... single user name from id: db.one('SELECT name FROM users WHERE id = $1', [123]) .then(user => { console.log(user.name); // print user name; }) .catch(error => { console.log(error); // print the error; }); // alternative - new ES7 syntax with 'await': // await ...
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How can I send large messages with Kafka (over 15MB)?

...roperties. Now also bigger messages work :). – Sonson123 Feb 3 '14 at 15:37 3 Are there any known...
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How do you build a Singleton in Dart?

...sible way: void main() { var s1 = Singleton.instance; s1.somedata = 123; var s2 = Singleton.instance; print(s2.somedata); // 123 print(identical(s1, s2)); // true print(s1 == s2); // true //var s3 = new Singleton(); //produces a warning re missing default constructor and breaks on ...
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Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...法执行,因为所有的线程都很忙。 在为时间可能很长的操作使用合用的线程时要小心。如果程序必须等待诸如 I/O 完成这样的某个资源,那么请指定最长的等待时间,以及随后是失效还是将任务重新排队以便稍后执行。这样做...
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网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...BD DA”。 我们知道,“春”和“节”的GB2312编码(我的操作系统“Windows XP”中文版的默认编码)分别是“B4 BA”和“BD DA”。因此,IE实际上就是将查询字符串,以GB2312编码的格式发送出去。 Firefox的处理方法,略有不同。它...
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Flask-SQLAlchemy how to delete all rows in a single table

...e query. ex. #for specific value db.session.query(Model).filter(Model.id==123).delete() db.session.commit() Delete Single Record by Object record_obj = db.session.query(Model).filter(Model.id==123).first() db.session.delete(record_obj) db.session.commit() https://flask-sqlalchemy.palletsprojec...
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开源跳板机(堡垒机)Jumpserver v2.0.0 使用说明 - 开源 & Github - 清泛网 ...

... connect.py脚本登录自启动,部署文档后面有说明, 下面的操作为试了方便测试 # cd /opt/jumpserver # python connect.py 输入p或P 查看所有授权主机 输入g或G 查看授权主机组 输入g或G加上组的ID,查看该组下的主机 输入e 可以进入...