大约有 45,000 项符合查询结果（耗时：0.0829秒） [XML]
How can I return NULL from a generic method in C#?
...
Two options:
Return default(T) which means you'll return null if T is a reference type (or a nullable value type), 0 for int, '\0' for char, etc. (Default values table (C# Reference))
Restrict T to be a reference type with the where T : class constraint and then return null as normal
...
How to send an email with Python?
... following example (reproduced from the Python documentation). Notice that if you follow this approach, the "simple" task is indeed simple, and the more complex tasks (like attaching binary objects or sending plain/HTML multipart messages) are accomplished very rapidly.
# Import smtplib for the act...
Determining the last changelist synced to in Perforce
...:
p4 changes -m1 @clientname
they note a few gotchas:
This only works if you have not submitted anything from the workspace in question.
It is also possible that a client workspace is not synced to any specific changelist.
and there's an additional gotcha they don't mention:
If the highes...
I just discovered why all ASP.Net websites are slow, and I am trying to work out what to do about it
...
If your page does not modify any session variables, you can opt out of most of this lock.
<% @Page EnableSessionState="ReadOnly" %>
If your page does not read any session variables, you can opt out of this lock entir...
Java array reflection: isArray vs. instanceof
Is there a preference or behavior difference between using:
8 Answers
8
...
Should one use < or
If you had to iterate through a loop 7 times, would you use:
39 Answers
39
...
Add primary key to existing table
...ption in the case of composite PKs for performance on insertion date basis if that is important for you.
– Shiv
Feb 10 '17 at 5:23
add a comment
|
...
Copy/duplicate database without using mysqldump
...
If you don't want to save the password plaintext in your terminals history, you need to split the command: mysqldump -h [server] -u [user] -p db1 > db1, mysql -h [server] -u [user] -p db2 < db1 Otherwise the password p...
How do I disable right click on my web page?
...ing of the right click (context) menu anyway.
Not sure why you'd want to. If it's out of some misplaced belief that you can protect your source code or images that way, think again: you can't.
share
|
...
What is the difference between onPause() and onStop() of Android Activites?
...
No, if some activity comes into foreground, that doesn't necessarily mean that the other activity is completely invisible. Consider the following case:
Here we see both activities at the same time. The first activity with the ...