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How do you do a deep copy of an object in .NET? [duplicate]
...
I've seen a few different approaches to this, but I use a generic utility method as such:
public static T DeepClone<T>(this T obj)
{
using (var ms = new MemoryStream())
{
var formatter = new BinaryFormatter();
formatter.Ser...
Check if all checkboxes are selected
How do I check if all checkboxes with class="abc" are selected?
9 Answers
9
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Switch statement: must default be the last case?
...ice:
Any statement may be preceded by a
prefix that declares an identifier as
a label name. Labels in themselves do
not alter the flow of control, which
continues unimpeded across them.
Edit: The code within a switch is nothing special; it is a normal block of code as in an if-stateme...
#if Not Debug in c#?
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You would need to use:
#if !DEBUG
// Your code here
#endif
Or, if your symbol is actually Debug
#if !Debug
// Your code here
#endif
From the documentation, you can effectively treat DEBUG as a boolean. So you can do complex tests like:
...
How can I build XML in C#?
...y to an object model. In .NET 3.5, XDocument, etc. are also very friendly. If the size is very large, then XmlWriter is your friend.
For an XDocument example:
Console.WriteLine(
new XElement("Foo",
new XAttribute("Bar", "some & value"),
new XElement("Nested", "data")));
O...
What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
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@some_var.is_a?(Hash)
It's worth noting that the "is_a?" method is true if the class is anywhere in the objects ancestry tree. for instance:
@some_var.is_a?(Object) # => true
the above is true if @some_var is an instance of a hash or other class that stems from Object. So, if you want a st...
Remove all values within one list from another list? [duplicate]
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>>> a = range(1, 10)
>>> [x for x in a if x not in [2, 3, 7]]
[1, 4, 5, 6, 8, 9]
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What happens if a finally block throws an exception?
If a finally block throws an exception, what exactly happens?
11 Answers
11
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When to throw an exception?
...a function which is supposed to examine an arbitrary class and return true if that class inherits from List<>. This function asks the question, "Is this object a descendant of List?" This function should never throw an exception, because there are no gray areas in its operation - every single ...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...that uses a lockfile and echoes a PID into it. This serves as a protection if the process is killed before removing the pidfile:
LOCKFILE=/tmp/lock.txt
if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
echo "already running"
exit
fi
# make sure the lockfile is removed when w...