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Cleaner way to do a null check in C#? [duplicate]
...public static class Helper
{
public static bool IsNull<T>(this T root,Expression<Func<T, object>> getter)
{
var visitor = new IsNullVisitor();
visitor.CurrentObject = root;
visitor.Visit(getter);
return visitor.IsNull;
}
}
class Program
...
How to select rows that have current day's timestamp?
... the `` are important because timestamp (and date as in my case) is a MySQL reserved word
– Victor Ferreira
Jan 10 '15 at 19:39
...
How do I change the root directory of an apache server? [closed]
Does anyone know how to change the document root of the Apache server? I basically want localhost to come from /users/spencer/projects directory instead of /var/www .
...
Configure Log4net to write to multiple files
...sage%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="File1Appender" />
<appender-ref ref="File2Appender" />
</root>
</log4net>
...
SQL - find records from one table which don't exist in another
I've got the following two SQL tables (in MySQL):
8 Answers
8
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JavaScript Regular Expression Email Validation [duplicate]
...his is invalid too. Look at list of highest level domains iana.org/domains/root/db
– Daniel
Apr 22 '18 at 20:25
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Convert JS Object to form data
...hould work on IE11 and evergreen browsers.
function objectToFormData(obj, rootName, ignoreList) {
var formData = new FormData();
function appendFormData(data, root) {
if (!ignore(root)) {
root = root || '';
if (data instanceof File) {
formDat...
What data is stored in Ephemeral Storage of Amazon EC2 instance?
...f you "stop" an instance that is backed by EBS then the information on the root volume will still be in the same state when you "start" the machine again. According to the documentation, "By default, the root device volume and the other Amazon EBS volumes attached when you launch an Amazon EBS-back...
Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...自己的操作系统，到最初Linux 内核0.01 版公布，以及从此如何艰难地一步一个脚印地在全世界hacker 的帮助下最后推出比较完善的1.0 版本这段时间的发展经过，也即对Linux 的早期发展历史进行详细介绍。
对于Linux的一般发...
/etc/apt/sources.list" E212: Can't open file for writing
...
That happens to me all the time, I open a root file for writing:
Instead of losing all your changes and re-opening with sudo. See this demo of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.t...