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领域驱动设计系列（五）:事件驱动之异步事件 - 更多技术 - 清泛网 - 专注C/...
... var handlers = _eventHandlerFactory.GetHandlers<T>();
handlers.Select(h => Task.Factory.StartNew(() => HandleEvent<T>(h, @event)));
}
这段代码执行完，尽然发现Handler没有执行，好吧，原因是IQueryable的延迟执行，所以我们需要调用一下ToL...
Linq 多字段排序，二次排序 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ed = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );类似SQL：select * from t1 order by f1 d...Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByD...
C#泛型(List)中基类和子类 怎么转换？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...函数Foo，Foo支持所有子类列表。
方法一：
Foo(childList.Select(p => p as BaseClass).ToList())
上述 Select 转换是双向的，基类转子类也没问题。
方法二：
List<BaseClass> baseList = new List<BaseClass>();
baseList.AddRange(childList);
Foo(baseList);
...
C#泛型(List)中基类和子类 怎么转换？ - .NET(C#) - 清泛IT论坛，有思想、有深度
...函数Foo，Foo支持所有子类列表。
方法一：
Foo(childList.Select(p => p as BaseClass).ToList())
上述 Select 转换是双向的，基类转子类也没问题。
方法二：
List<BaseClass> baseList = new List<BaseClass>();
baseList.AddRange(childList);
Foo(b...
App Inventor 2 如何连接MySQL数据库（阿里云数据库） · App Inventor 2 中文网
...接信息
测试代码
注意事项：
返回 HTTP 代码 200 表示SELECT 查询成功
返回 HTTP 代码 201 表示不是有效的 SELECT 查询
返回 HTTP 代码 400，表示 SQL 查询错误
请注意SQL注入风险，加强php代码的检查逻辑
前端代码块
执行sql语...
【鸿蒙内核】记录一次鸿蒙内核问题跟踪历程 - C/C++ - 清泛IT社区，为创新赋能！
...言。
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在纯血鸿蒙上出现了一个网络问题，使用 select 模型，Win/Linux都运行的很好，但是鸿蒙总是失败。
根据日志，标准Linux则是自动重用FID，比如10号关闭再打开，还是10号；但是鸿蒙不是，它会一直增加，到了1024 select...
How to design a product table for many kinds of product where each product has many parameters
...urther If you would like to improve the performance of the queries you can select certain operations like for e.g. reporting or global text search and prepare for them index tables which would store required data and would be regenerated periodically, lets say every 30 minutes.
You don't even need ...
How can I see what I am about to push with git?
...etween what is on the remote and what you are about to push to the remote, select your local unpushed commit and right-click on the remote and choose "Diff this -> selected":
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javac not working in windows command prompt
...anced" tab ⇒ Environment Variables
In "System Variables", scroll down to select "PATH" ⇒ Edit
(( now read the following 3 times before proceeding, THERE IS NO UNDO ))
In "Variable value" field, INSERT "c:\Program Files\Java\jdk1.8.0_xx\bin" (Replace xx with the upgrade number and VERIFY that ...
ViewController respondsToSelector: message sent to deallocated instance (CRASH)
...e where this was performed (If this isn't working, you can examine call by selecting it and choosing its counterpart in Extended Detail pane):
This will let you examine all the retainCount lifecycle of object and probably you'll find your problem right away. All you got to do is find missing reta...