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Super-simple example of C# observer/observable with delegates
...re's an example:
using System;
class Observable
{
public event EventHandler SomethingHappened;
public void DoSomething() =>
SomethingHappened?.Invoke(this, EventArgs.Empty);
}
class Observer
{
public void HandleEvent(object sender, EventArgs args)
{
Console.Wri...
The type initializer for 'MyClass' threw an exception
...ception; it is likely to contain information about the underlying problem, and exactly where it occurred.
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Adding the little arrow to the right side of a cell in an iPhone TableView Cell
...ply click click on the Table View, go to Prototype Cells on the right side and make it 1. Then click that Prototype Cell and on the right look for Accessory. In the drop-down, click Disclosure Indicator.
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Better way to check variable for null or empty string?
...
// Function for basic field validation (present and neither empty nor only white space
function IsNullOrEmptyString($str){
return (!isset($str) || trim($str) === '');
}
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DROP IF EXISTS VS DROP?
...
Standard SQL syntax is
DROP TABLE table_name;
IF EXISTS is not standard; different platforms might support it with different syntax, or not support it at all. In PostgreSQL, the syntax is
DROP TABLE IF EXISTS table_name;
...
Loaded nib but the 'view' outlet was not set
I added a new nib file to my project, and tried to load it.
32 Answers
32
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How to get string width on Android?
... edited Oct 6 '16 at 22:03
Andrii Abramov
7,20566 gold badges4848 silver badges7070 bronze badges
answered Sep 2 '10 at 19:05
...
Recursive file search using PowerShell
...ntinue -fo -inc "filename.txt" | % { $_.fullname }
– Andrew
Nov 4 '17 at 7:34
...
cd into directory without having permission
...
Enter super user mode, and cd into the directory that you are not permissioned to go into. Sudo requires administrator password.
sudo su
cd directory
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YAML Multi-Line Arrays
...['string1', 'string2', 'string3',
'string4', 'string5',
'string6']
and even have multi-line strings in single-line arrays:
key: ['string1', 'long
string', 'string3', 'string4', 'string5', 'string6']
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