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Cleaner way to do a null check in C#? [duplicate]
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In a generic way, you may use an expression tree and check with an extension method:
if (!person.IsNull(p => p.contact.address.city))
{
//Nothing is null
}
Full code:
public class IsNullVisitor : ExpressionVisitor
{
public bool IsNull { get; private set; }
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Different ways of clearing lists
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Why the first one will only affect a? I thought a and b reference to the same object... Just wanna know why. Thanks.
– Alston
Nov 22 '14 at 9:48
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Detect element content changes with jQuery
change() function works and detects changes on form elements, but is there a way of detecting when a DOM element's content was changed?
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Using @include vs @extend in Sass?
...I can't quite discern the difference between using @include with a mixin and using @extend with a placeholder class. Don't they amount to the same thing?
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How to truncate milliseconds off of a .NET DateTime
...ue. SQL Server of course keeps some precision of milliseconds on the time, and when read into a .NET DateTime, it includes those milliseconds. The incoming request to the system, however, does not offer that precision, so I need to simply drop the milliseconds.
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Reuse Cucumber steps
...de in like so: steps %Q{Given I am logged in}
– BrendanDean
Aug 9 '11 at 18:42
1
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Difference between `const shared_ptr` and `shared_ptr`?
...const T> p; ---> const T * const p; <=> T const * const p; : p and *p are const.
The same holds for weak_ptr and unique_ptr.
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How to initialize a vector in C++ [duplicate]
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With the new C++ standard (may need special flags to be enabled on your compiler) you can simply do:
std::vector<int> v { 34,23 };
// or
// std::vector<int> v = { 34,23 };
Or even:
std::vector<int> v(2);
v = { 34,23 };
O...
How to create a fixed-size array of objects
...st to initialize it empty, then I would put Sprites in the first 16 cells, and the last 16 cells (simulating an chess game).
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What's the significance of Oct 12 1999? [closed]
.... The dev who wrote THAT line of code, we think, is gone. We asked The Gu, and he wasn't sure.
Stefan Schackow, from the team, said, after speaking with Manu Vasandani:
"The ASP.NET developers were being
chased by a pack of feral ninjas on
fire and thus were under intense
pressure to com...