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Overriding fields or properties in subclasses
... Another option is to have a read-only property in the base class which is set from a constructor parameter:
abstract class Mother
{
private readonly int myInt;
public int MyInt { get { return myInt; } }
protected Mother(int myInt)
{
this.myInt = myInt;
}
}
class Daugh...
How to run a PowerShell script from a batch file
...
Otherwise PowerShell considers the arguments a line to execute and while Set-ExecutionPolicy is a cmdlet, it has no -File parameter.
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Check if table exists without using “select from”
...HOW TABLES
SHOW TABLES LIKE 'yourtable';
If there is a row in the resultset, table exists.
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How to make an element in XML schema optional?
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Set the minOccurs attribute to 0 in the schema like so:
<?xml version="1.0"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:element name="reques...
How to create a SQL Server function to “join” multiple rows from a subquery into a single delimited
... play tricks like this with a temporary variable:
declare @s varchar(max)
set @s = ''
select @s = @s + City + ',' from Locations
select @s
It's definitely less code than walking over a cursor, and probably more efficient.
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Separation of business logic and data access in django
...mail server, your system log, etc.
Such scenario's also really help you in setting up a Test Driven Development environment.
And finally, thinking in commands really helps you create a task-oriented application. Your users will appreciate this :-)
Expressing Commands
Django provides two easy ways of...
href image link download on click
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The easiest way of creating download link for image or html is setting download attribute, but this solution works in modern browsers only.
<a href="/path/to/image" download="myimage"><img src="/path/to/image" /></a>
"myimage" is a name of file to download. Extension...
Center image in table td in CSS
...een trying to align an image to the center of the table td. It worked with setting margin-left to a specific value but it also increased the size of td too and that isn't exactly what I wanted
...
Difference between std::system_clock and std::steady_clock?
...@Charles: Also, POSIX time is not "steady" -- if the user changes the time setting on their computer POSIX time will change. If you are cooking an egg, and need a timer that lasts 4 minutes, then you need it to last 4 minutes even if the current time is changed. If you've got a timer set for a meeti...
Truncating long strings with CSS: feasible yet?
...erflow: ellipsis;
-o-text-overflow: ellipsis;
-moz-binding: url('assets/xml/ellipsis.xml#ellipsis');
}
ellipsis.xml file contents
<?xml version="1.0"?>
<bindings
xmlns="http://www.mozilla.org/xbl"
xmlns:xbl="http://www.mozilla.org/xbl"
xmlns:xul="http://www.mozilla.org/keym...