大约有 40,000 项符合查询结果（耗时：0.0390秒） [XML]
Why can't I have abstract static methods in C#?
...also for something like class Car {public static virtual Car Build(PurchaseOrder PO);}, where every class deriving from Car would have to define a method which could build an instance given a purchase order.
– supercat
Jun 16 '13 at 20:23
...
Why is lock(this) {…} bad?
...enerally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock entry points hinders this. For example, any one with a reference to the o...
Difference Between Select and SelectMany
...
I understand SelectMany to work like a join shortcut.
So you can:
var orders = customers
.Where(c => c.CustomerName == "Acme")
.SelectMany(c => c.Orders);
share
|
...
Check synchronously if file/directory exists in Node.js
...t the top, followed by the various answers over the years in chronological order:
Current Answer
You can use fs.existsSync():
const fs = require("fs"); // Or `import fs from "fs";` with ESM
if (fs.existsSync(path)) {
// Do something
}
It was deprecated for several years, but no longer is. F...
What are enums and why are they useful?
...tants, which may override methods).
Implementing an interface (or more) in order to not bind the client code to the enum (which should only provide a set of default implementations).
The simplest example would be a set of Comparator implementations:
enum StringComparator implements Comparator<...
Parsing a CSV file using NodeJS
... NodeCSV is also well supported and happens to have approximately one order of magnitude more users. npmjs.com/package/csv
– steampowered
Jun 16 '15 at 16:21
4
...
How can I extract embedded fonts from a PDF as valid font files?
...o follow a few specific steps which are not necessarily straightforward in order to save the extracted font data as a file which is re-usable.
Using mupdf
Next, MuPDF. This application comes with a utility called pdfextract (on Windows: pdfextract.exe) which can extract fonts and images from PDFs. ...
accepting HTTPS connections with self-signed certificates
...server certificate". Are there any extra permissions that I have to set in order to make it work?
– Juriy
Feb 24 '11 at 21:59
1
...
How can I make setuptools install a package that's not on PyPI?
...name lets you specify what the project is as a dependency for others.
The order must always be @tag#egg=name.
Private Repositories
You can also install from private repositories by changing the protocol to SSH (ssh://) and adding an appropriate user (git@):
git+ssh://git@github.com/username/my_p...
How can I test an AngularJS service from the console?
...u the function itself or a new'ed version of it. Which is not the case. In order to get a constructor you would either have to do
app.factory('ExampleService',function(){
return function(){
this.f1 = function(world){
return 'Hello' + world;
}
...