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How to check if IEnumerable is null or empty?
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Count() only iterates the enumeration if it can't be cast to an ICollection. In other words, when you call this method, if there's already a Count property on the object, it will just return that and the performance should be identical. Check out the implementation here: refere...
Android and in TextView
...review in XML) nor by setting them in Java with setText(). Tried both with Android 4.1 and 4.2
– Stephan Wiesner
Feb 20 '13 at 6:08
1
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How can I put strings in an array, split by new line?
...h line breaks in my database. I want to convert that string into an array, and for every new line, jump one index place in the array.
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Kill a Process by Looking up the Port being used by it from a .BAT
In Windows what can look for port 8080 and try to kill the process it is using through a .BAT file?
14 Answers
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Insert a row to pandas dataframe
... as both objects are of the same type. Maybe the issue is that you need to cast your second vector to a dataframe? Using the df that you defined the following works for me:
df2 = pd.DataFrame([[2,3,4]], columns=['A','B','C'])
pd.concat([df2, df])
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How do I create a Bash alias?
I'm on OSX and I need to put something like this, alias blah="/usr/bin/blah" in a config file but I don't know where the config file is.
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When should a class be Comparable and/or Comparator?
...he compile-time error) ; your implementation has to cope with objects, and cast as needed but in a robust way.
Comparable<Itself> is very strict on the contrary.
Funny, when you subclass Itself to Subclass, Subclass must also be Comparable and be robust about it (or it would break Liskov ...
How to create a button programmatically?
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As of Swift 1.2 downcasts can no longer be done with "as", they must be “forced failable” with "as!".
– TenaciousJay
May 1 '15 at 16:38
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Using ConfigurationManager to load config from an arbitrary location
...e following exception on accessing the AppSettings property:
Unable to cast object of type 'System.Configuration.DefaultSection' to type 'System.Configuration.AppSettingsSection'.
Here is the correct solution:
System.Configuration.ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap(...
Can you make valid Makefiles without tab characters?
...that Makefiles have a tab character preceding the the content of each command line, or it throws a syntax error.
10 Answe...