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Null coalescing in powershell
...e unwanted whitespace round it:
$name = ([string]$row.td[0]).Trim()
The cast to string protects against the element being null and prevents any risk of Trim() failing.
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Is there a more elegant way of adding an item to a Dictionary safely?
... throw) and the indexer otherwise. (It's a bit like the difference between casting and using as for reference conversions.)
If you're using C# 3 and you have a distinct set of keys, you can make this even neater:
var currentViews = new Dictionary<string, object>()
{
{ "Customers", "view2...
Preserving order with LINQ
... You can map a source element by index to a result element
AsEnumerable
Cast
Concat
Select
ToArray
ToList
Preserves Order. Elements are filtered or added, but not re-ordered.
Distinct
Except
Intersect
OfType
Prepend (new in .net 4.7.1)
Skip
SkipWhile
Take
TakeWhile
Where
Zip (new in .net 4)
...
Difference between case object and object
... difference:
scala> foo.asInstanceOf[Serializable]
java.lang.ClassCastException: foo$ cannot be cast to scala.Serializable
... 43 elided
scala> foocase.asInstanceOf[Serializable]
res1: Serializable = foocase
toString difference:
scala> foo
res2: foo.type = foo$@7bf0b...
Do I have to guard against SQL injection if I used a dropdown?
... is also "involving any variable data". There are a few cases like PHP int casting maybe but it seems better to just use prepared statements. Telling (unexperienced) people that a minor performance "boost" is more important than security is way off. The answer is "incomplete" but it sends a strong m...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
...e caveat (as stated on the linked page) is that it needs to be assigned or cast into an uint8_t or there will be garbage in the upper bits.
– Arkku
Apr 8 '10 at 20:20
...
Check for column name in a SqlDataReader object
...is a working sample for Jasmin's idea:
var cols = r.GetSchemaTable().Rows.Cast<DataRow>().Select
(row => row["ColumnName"] as string).ToList();
if (cols.Contains("the column name"))
{
}
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How to easily map c++ enums to strings
...(temp.str()); \
os << enumName << "::" << strings[static_cast<int>(value)]; \
return os;}
To use it in your code, simply do:
AWESOME_MAKE_ENUM(Animal,
DOG,
CAT,
HORSE
);
auto dog = Animal::DOG;
std::cout<<dog;
...
Find size of object instance in bytes in c#
...array for data and an unmanaged proxy class to access values using pointer casting if size matters, note that would be non-aligned memory so on old computers is gonna be slow but HUGE datasets on MODERN RAM is gonna be considerably faster, as minimizing the size to read from RAM is gonna be a bigger...
Input text dialog Android
...
Remember to cast that findViewById with (ViewGroup)!
– Martin Erlic
Sep 27 '16 at 17:24
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