大约有 16,000 项符合查询结果（耗时：0.0260秒） [XML]
Convert a List into an ObservableCollection
I have a List<T> which is being populated from JSON. I need to convert it into an ObservableCollection<T> to bind it to my GridView .
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SQL order string as number
...version to number
select col from yourtable
order by col + 0
BTW MySQL converts strings from left to right. Examples:
string value | integer value after conversion
--------------+--------------------------------
'1' | 1
'ABC' | 0 /* the string does not contain a number, ...
GCC dump preprocessor defines
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gcc exists on systems where /dev/null means nothing.
– Pavel P
Jan 12 '14 at 1:29
4
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How to ignore deprecation warnings in Python
...s an argument to Python. Better though to resolve the issue, by casting to int.
(Note that in Python 3.2, deprecation warnings are ignored by default.)
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Fastest way to check if a file exist using standard C++/C++11/C?
...s, half on files that existed and half on files that didn't.
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <fstream>
inline bool exists_test0 (const std::string& name) {
ifstream f(name.c_str());
return f.good();
}
inline bool exists_test...
What is an alternative to execfile in Python 3?
... is better, since it takes the globals and locals from the caller:
import sys
def execfile(filename, globals=None, locals=None):
if globals is None:
globals = sys._getframe(1).f_globals
if locals is None:
locals = sys._getframe(1).f_locals
with open(filename, "r") as fh:...
How to cast int to enum in C++?
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MSDN: The static_cast operator can explicitly convert an integral value to an enumeration type. If the value of the integral type does not fall within the range of enumeration values, the resulting enumeration value is undefined.
– Kirill Kobelev
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Android: Difference between Parcelable and Serializable?
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How about converting objects to json string instead with gson?
– F.O.O
Sep 10 '16 at 8:51
add a comment
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Re-raise exception with a different type and message, preserving existing information
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You can use sys.exc_info() to get the traceback, and raise your new exception with said traceback (as the PEP mentions). If you want to preserve the old type and message, you can do so on the exception, but that's only useful if whatever...
How to convert comma-delimited string to list in Python?
...",")
>>> print my_list
['A', 'B', 'C', 'D', 'E']
If you want to convert it to a tuple, just
>>> print tuple(my_list)
('A', 'B', 'C', 'D', 'E')
If you are looking to append to a list, try this:
>>> my_list.append('F')
>>> print my_list
['A', 'B', 'C', 'D', 'E...