大约有 19,600 项符合查询结果（耗时：0.0400秒） [XML]
How unique is UUID?
...(I'm using it for files uploaded to the server)? As I understand it, it is based off random numbers. However, it seems to me that given enough time, it would eventually repeat it self, just by pure chance. Is there a better system or a pattern of some type to alleviate this issue?
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A type for Date only in C# - why is there no Date type?
...want to make explicit that certain variables and method-arguments are date-based . Hence I can't use the DateTime.Date property
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Why use 'virtual' for class properties in Entity Framework model definitions?
..., which is why it requires certain properties to be marked virtual in your base class POCOs. It literally creates new types that derive from your POCO types. So your POCO is acting as a base type for the Entity Framework's dynamically created subclasses. That's what I meant by "create a proxy around...
Getting the count of unique values in a column in bash
...t column
* Sort the values by the number of occurrences
* Secondary sort based on the value (for example b vs g vs m vs z)
* Iterate through the result hash, using the sorted list
* Print the value and number of each occurrence
Results based on the sample input files provided by @Dennis
colu...
How to hide only the Close (x) button?
...rride CreateParams CreateParams
{
get
{
CreateParams myCp = base.CreateParams;
myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON ;
return myCp;
}
}
Source: http://www.codeproject.com/KB/cs/DisableClose.aspx
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pyplot scatter plot marker size
...dth is double the previous one so for the area this is an exponential with base 4. Similarly the second example each circle has area double the last one which gives an exponential with base 2.
However it is the second example (where we are scaling area) that doubling area appears to make the circle...
Get characters after last / in url
...
I am wondering why the $str = basename($url) is not getting more upvotes, works perfectly fine for me.
– redanimalwar
Nov 2 '15 at 16:39
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Swift equivalent for MIN and MAX macros
...upport macros and it seems that there are no equivalents in the language / base library. Should one go with a custom solution, maybe based on generics like this one ?
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How to get duration, as int milli's and float seconds from ?
...n<long long, nano>. So there's an implicit conversion from integral-based nanoseconds to float-based seconds happening on that line, only because the destination type is specified with fsec.
– Howard Hinnant
Jan 18 '13 at 17:45
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What is the exact problem with multiple inheritance?
...ects in memory.
Languages like C++ and Java and C# create a fixed address-based layout for each type of object. Something like this:
class A:
at offset 0 ... "abc" ... 4 byte int field
at offset 4 ... "xyz" ... 8 byte double field
at offset 12 ... "speak" ... 4 byte function pointer
c...