大约有 42,000 项符合查询结果（耗时：0.0605秒） [XML]
Direct casting vs 'as' operator?
...1
Throws InvalidCastException if o is not a string. Otherwise, assigns o to s, even if o is null.
string s = o as string; // 2
Assigns null to s if o is not a string or if o is null. For this reason, you cannot use it with value types (the operator could never return null in that case). Otherwi...
How do you close/hide the Android soft keyboard using Java?
I have an EditText and a Button in my layout.
108 Answers
108
...
What is the difference between Trap and Interrupt?
...used by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended and continues afterwards). In a sense they are "active" - most of the ...
How to map and remove nil values in Ruby
I have a map which either changes a value or sets it to nil. I then want to remove the nil entries from the list. The list doesn't need to be kept.
...
Any way to select without causing locking in MySQL?
...
Just a note to future readers that you may wish to eliminate SESSION and thus have the transaction level apply only to the next transaction. Then, simply replace the third statement above with COMMIT. This will be a noop in this case, bu...
Force to open “Save As…” popup open at text link click for PDF in HTML
I have some big size PDF catalogs at my website, and I need to link these as download. When I googled, I found such a thing noted below. It should open the " Save As... " popup at link click...
...
How to resolve the C:\fakepath?
This is my upload button.
12 Answers
12
...
Sync data between Android App and webserver [closed]
I want to sync data (such as db record, media) between an Android App and a Server. If you've seen Evernote or similar Applications, you certainly understand what I mean.
...
Make XAMPP/Apache serve file outside of htdocs [closed]
Is it possible to configure xampp to serve up a file outside of the htdocs directory?
6 Answers
...
Conditional Variable vs Semaphore
...
Locks are used for mutual exclusion. When you want to ensure that a piece of code is atomic, put a lock around it. You could theoretically use a binary semaphore to do this, but that's a special case.
Semaphores and condition variables build on top of the mutual exclusion p...