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Help with C# generics error - “The type 'T' must be a non-nullable value type”
...le<T> itself. In other words, you could try to call:
CoalesceMax<string>(...)
which wouldn't make sense, as Nullable<string> isn't valid.
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Warn user before leaving web page with unsaved changes
...ou can do this by handling the beforeunload event and returning a non-null string:
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = 'It looks like you have been editing something. '
+ 'If you leave before saving, your changes will be l...
How to write trycatch in R
...
Given that the first string in your paste functions ends with a space, why not omit the space and the sep=""?
– seancarmody
Aug 30 '12 at 11:56
...
Set inputType for an EditText Programmatically?
...ATETIME_VARIATION_TIME));
}
class InputTypeItem {
private String name;
private int value;
InputTypeItem(String name, int value) {
this.name = name;
this.value = value;
}
}
}
See also
Getting the current InputType
...
Do I have to guard against SQL injection if I used a dropdown?
...less, you must use Prepared Statements (recommended) or mysqli_real_escape_string. Also properly escape the values when outputting them (e.g. use htmlspecialchars() in a HTML document).
– ComFreek
Mar 20 '14 at 18:12
...
How do I use itertools.groupby()?
... # equivalent
>>> def islower(s):
... """Return True if a string is lowercase, else False."""
... return s.islower()
>>> print_groupby(sorted("bCAaCacAADBbB"), keyfunc=islower)
key: 'False'--> group: ['A', 'A', 'A', 'B', 'B', 'C', 'C', 'D']
key: 'True'--> group...
How do you implement a private setter when using an interface?
...terface you can define only getter for your property
interface IFoo
{
string Name { get; }
}
However, in your class you can extend it to have a private setter -
class Foo : IFoo
{
public string Name
{
get;
private set;
}
}
...
Url.Action parameters?
...ntroller action passing the two parameters:
public ActionResult GetByList(string name, string contact)
{
...
}
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How to 'insert if not exists' in MySQL?
...ique($table, $vars)
{
if (count($vars)) {
$table = mysql_real_escape_string($table);
$vars = array_map('mysql_real_escape_string', $vars);
$req = "INSERT INTO `$table` (`". join('`, `', array_keys($vars)) ."`) ";
$req .= "SELECT '". join("', '", $vars) ."' FROM DUAL ";
$req .=...
Running bash script from within python
...eep.sh', 0o755) then you could read the script as a text file and pass the string to subprocess module instead:
with open('sleep.sh', 'rb') as file:
script = file.read()
rc = call(script, shell=True)
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