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Generic List - moving an item within the list
...class has a Move method that does exactly what you want.
public void Move(int oldIndex, int newIndex)
Underneath it is basically implemented like this.
T item = base[oldIndex];
base.RemoveItem(oldIndex);
base.InsertItem(newIndex, item);
So as you can see the swap method that others have sugges...
Javascript object Vs JSON
...worth noting that a key in JSON must be enclosed in double quotes.
If I convert the above object to JSON using var jSonString = JSON.stringify(testObject);, what is the difference between the 2 (JS obj and JSON)?
JSON is a data interchange format. It's a standard which describes how ordered lis...
How does comparison operator works with null int?
I am starting to learn nullable types and ran into following behavior.
4 Answers
4
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Condition within JOIN or WHERE
...u only those records that have an order dated later than May 15, 2009 thus converting the left join to an inner join.
The second will give those records plus any customers with no orders. The results set is very different depending on where you put the condition. (Select * is for example purposes on...
Display image as grayscale using matplotlib
...s plt
from PIL import Image
fname = 'image.png'
image = Image.open(fname).convert("L")
arr = np.asarray(image)
plt.imshow(arr, cmap='gray', vmin=0, vmax=255)
plt.show()
If you want to display the inverse grayscale, switch the cmap to cmap='gray_r'.
...
How to get the selected index of a RadioGroup in Android
...
You should be able to do something like this:
int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
View radioButton = radioButtonGroup.findViewById(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);
If the RadioGroup contains other Views (...
xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false”(性能警告) 1>C: Program Files (x86) Microsoft Visual Studio 11.0 VC include xtree(1796): warning C4800: int: 将值强制为布尔值true或f...1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\inc...
Usage of protocols as array types and function parameters in swift
...
You want to create a generic class, with a type constraint that requires the classes used with it conform to SomeProtocol, like this:
class SomeClass<T: SomeProtocol> {
typealias ElementType = T
var protocols = [ElementType]()
func addElement(element: ElementT...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...et/manual/en/function.random-bytes.php
PHP 5 (outdated)
I was just looking into how to solve this same problem, but I also want my function to create a token that can be used for password retrieval as well. This means that I need to limit the ability of the token to be guessed. Because uniqid is bas...
Turning a Comma Separated string into individual rows
...ions from SQL Server:
Sample table:
CREATE TABLE Testdata
(
SomeID INT,
OtherID INT,
String VARCHAR(MAX)
)
INSERT Testdata SELECT 1, 9, '18,20,22'
INSERT Testdata SELECT 2, 8, '17,19'
INSERT Testdata SELECT 3, 7, '13,19,20'
INSERT Testdata SELECT 4, 6, ''
INSERT Testdata SELECT ...