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Should I avoid 'async void' event handlers?
I know it is considered generally a bad idea to use fire-and-forget async void methods to start tasks, because there is no track of the pending task and it is tricky to handle exceptions which might be thrown inside such a method.
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Change Image of ImageView programmatically in Android
...ricyicy says, the problem is that the xml is defining the background image and the code is changing the resource image. Those are not the same. Setting the resource image is what is actually desired here, so the xml should be fixed.
– Martin Epsz
Oct 20 '15 at ...
git revert back to certain commit [duplicate]
... answered Jul 22 '11 at 18:12
AndyAndy
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Calling Java varargs method with single null argument?
If I have a vararg Java method foo(Object ...arg) and I call foo(null, null) , I have both arg[0] and arg[1] as null s. But if I call foo(null) , arg itself is null. Why is this happening?
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Remove characters from C# string
...must at some point iterate through the string to perform their operations, and they can be much slower with the overheads from the regex itself. They really excel when it comes to extremely complex manipulation, where dozens of lines of code and multiple loops would be needed. Testing the compiled...
How do I iterate through the alphabet?
... addition to string.ascii_lowercase you should also take a look at the ord and chr built-ins. ord('a') will give you the ascii value for 'a' and chr(ord('a')) will give you back the string 'a'.
Using these you can increment and decrement through character codes and convert back and forth easily eno...
String.Empty versus “” [duplicate]
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As the duplicate say, its not different in .NET 2 and above.
– JoeBilly
May 28 '10 at 12:27
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Is there any way to view the currently mapped keys in Vim?
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You can do that with the :map command. There are also other variants.
:nmap for normal mode mappings
:vmap for visual mode mappings
:imap for insert mode mappings
The above list is not complete. Typing :help map in Vim will give you more info.
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Django optional url parameters
...to rename the product kwarg to product_id, you only have to change line 4, and it will affect the below URLs.
Edited for Django 1.8 and above
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Splitting a Java String by the pipe symbol using split(“|”)
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You need
test.split("\\|");
split uses regular expression and in regex | is a metacharacter representing the OR operator. You need to escape that character using \ (written in String as "\\" since \ is also a metacharacter in String literals and require another \ to escape it).
You...