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“Items collection must be empty before using ItemsSource.”
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Armentage... you just saved me I don't know how many hours of looking for this!!! Thanks so much for posting this... voting up!
– John Fairbanks
Aug 3 '14 at 22:23
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What are the differences between Deferred, Promise and Future in JavaScript?
...nsidered writing a new answer. However, I think the OP actually wanted to know what Promises and Deferreds are for. The answer to his actual question would be, roughly, "deferreds can resolve their-self. AFAIK, the theory behind promises and deferreds comes from [Functional Reactive Programming|hask...
How can I default a parameter to Guid.Empty in C#?
...defined as static readonly not as const). Compiler can only have compiler-known values as method parameters default values (not runtime-only-known).
The root cause is that you cannot have a const of any struct, unlike enum for example. If you try it, it will not compile.
The reason once more is th...
How do I remove code duplication between similar const and non-const member functions?
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@VioletGiraffe we know that the object wasn't originally created const, as it is a non-const member of a non const object, which we know because we are in a non-const method of said object. The compiler doesn't make this inference, it follows a...
List comprehension on a nested list?
...s actually same as :
New_list=[]
for x in l:
New_list.append(x)
And now nested list comprehension :
[[float(y) for y in x] for x in l]
is same as ;
new_list=[]
for x in l:
sub_list=[]
for y in x:
sub_list.append(float(y))
new_list.append(sub_list)
print(new_list)
o...
Markdown and including multiple files
...gle link from one file to another in any version of markdown (so far as I know).
The closest you could come to this functionality is Pandoc. Pandoc allows you to merge files as a part of the transformation, which allows you to easily render multiple files into a single output. For example, if y...
Do HttpClient and HttpClientHandler have to be disposed between requests?
... Console.ReadKey();
}
}
}
With this new understanding, now we revisit that blog post,
we can clearly notice that the "fix" initializes HttpClient once but never dispose it,
that is why we can see from its netstat output that,
the connection remains at ESTABLISHED state which mean...
How can I take more control in ASP.NET?
...at you want to have the fields on the same page as the results and (to my knowledge) a Repeater is the only DataBound control that will run without a runat="server" attribute in the Form tag.
share
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Scripting Language vs Programming Language [closed]
...mentation was entirely interpreted (a "scripting" language), but there are now multiple compilers for it.
Some examples of "scripting" languages (e.g., languages that are traditionally used without an explicit compilation step):
Lua
JavaScript
VBScript and VBA
Perl
And a small smattering of one...
PHP 5: const vs static
...s 10
echo ClassName::MY_CONST; // returns 5
ClassName::$my_var = 20; // now equals 20
ClassName::MY_CONST = 20; // error! won't work.
Public, protected, and private are irrelevant in terms of consts (which are always public); they are only useful for class variables, including static variable....