大约有 7,400 项符合查询结果（耗时：0.0264秒） [XML]
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 can I reset a react component including all transitively reachable state?
...mention and state of children is reset, you can add a key attribute to the root-level component returned by render; when it changes, that component will be thrown away and created from scratch.
render: function() {
// ...
return <div key={uniqueId}>
{children}
</div>...
Maven project.build.directory
...
...so project.base.dir points to the root directory of the project where the pom.xml is. That's why after that, project.build.directory defined by Maven is ${project.basedir}/target. Thanks guys, I didn't know this.
– evaldeslacasa
...
Should the folders in a solution match the namespace?
...ough.
The rules we follow are:
Project/assembly name is the same as the root namespace, except for the .dll ending
Only exception to the above rule is a project with a .Core ending, the .Core is stripped off
Folders equals namespaces
One type per file (class, struct, enum, delegate, etc.) makes i...
How do I design a class in Python?
...ormat but could easily convert to other formats when outputting (Postgres, MySQL, MongoDB).
Now let's think through the Database object. What does this hide and store? Well clearly it can't store the full contents of the database, since that is why we have a database! So what is the point? The goal...
java.util.Date vs java.sql.Date
...
My mysql column is a datetime, but doing ps.setDate(new java.sql.Date(myObject.getCreatedDate().getTime())); I am loosing the milliseconds portion, how to fix this?
– Blankman
Apr 23 '12 at...
Should I be concerned about excess, non-running, Docker containers?
... those files which are required to run that piece of software (for example mysql, redis etc.) with basic configurations in a container environment.
When you create a container using an image, a small section of resources from your system are isolated with the help of namespacing and cgroups, and the...
Get generated id after insert
...
I had quite a bit of problems with this on mySQL, the LAST_INSERT_ID is not reliable way to get the ID, if you have users hammering the database, the ID returned may not be the ID that was inserted by the query you have run, several other users might impact on the ret...
Linux/Unix command to determine if process is running?
...l/bash command that will determine if a specific process is running. e.g. mysqld , httpd ...
What is the simplest way/command to do this?
...
What is the best way to compare floats for almost-equality in Python?
...operation (notably multiplication, division, addition, subtraction, square root). (In case of tie, round so the low bit is even.) (Be particularly careful about square root and division; your language implementation might use methods that do not conform to IEEE 754 for those.) Because of this requir...