大约有 42,000 项符合查询结果（耗时：0.0512秒） [XML]
How to tell whether a point is to the right or left side of a line
...
Use the sign of the determinant of vectors (AB,AM), where M(X,Y) is the query point:
position = sign((Bx - Ax) * (Y - Ay) - (By - Ay) * (X - Ax))
It is 0 on the line, and +1 on one side, -1 on the other side.
...
How do I run a shell script without using “sh” or “bash” commands?
I have a shell script which I want to run without using the "sh" or "bash" commands. For example:
11 Answers
...
How do I use reflection to call a generic method?
...generic = method.MakeGenericMethod(myType);
generic.Invoke(this, null);
For a static method, pass null as the first argument to Invoke. That's nothing to do with generic methods - it's just normal reflection.
As noted, a lot of this is simpler as of C# 4 using dynamic - if you can use type infere...
Why is using 'eval' a bad practice?
I am using the following class to easily store data of my songs.
8 Answers
8
...
How to loop through a directory recursively to delete files with certain extensions
I need to loop through a directory recursively and remove all files with extension .pdf and .doc . I'm managing to loop through a directory recursively but not managing to filter the files with the above mentioned file extensions.
...
When to use IList and when to use List
...on't know when to use each one. What I'm doing now is if I don't need the Sort or FindAll methods I use the interface. Am I right? Is there a better way to decide when to use the interface or the concrete type?
...
How do ACID and database transactions work?
...
Atomicity means that you can guarantee that all of a transaction happens, or none of it does; you can do complex operations as one single unit, all or nothing, and a crash, power failure, error, or anything else won't allow you to be in a state in which only some of the related changes have happene...
Should I use tag for icons instead of ? [closed]
Facebook's HTML and Twitter Bootstrap HTML (before v3) both use the <i> tag to display icons.
7 Answers
...
C++11 range based loop: get item by value or reference to const
...tems as well as want to avoid making copies, then auto const & is the correct choice:
for (auto const &x : vec)
Whoever suggests you to use auto & is wrong. Ignore them.
Here is recap:
Choose auto x when you want to work with copies.
Choose auto &x when you want to work with or...
Single script to run in both Windows batch and Linux Bash?
... character sequence “:;”. If you’re writing mostly one-liner scripts or, as may be the case, can write one line of sh for many lines of cmd, the following might be fine. Don’t forget that any use of $? must be before your next colon : because : resets $? to 0.
:; echo "Hi, I’m ${SHELL}.";...