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How to find out if a file exists in C# / .NET?
I would like to test a string containing a path to a file for existence of that file (something like the -e test in Perl or the os.path.exists() in Python) in C#.
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In Java, how do I call a base class's method from the overriding method in a derived class?
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class test
{
void message()
{
System.out.println("super class");
}
}
class demo extends test
{
int z;
demo(int y)
{
super.message();
z=y;
System.out.println("re:"+z);
}
}...
Global variables in R
... set a global variable in a mailinglist posting via assign:
a <- "old"
test <- function () {
assign("a", "new", envir = .GlobalEnv)
}
test()
a # display the new value
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How do I set a JLabel's background color?
...set the background of a JLabel to a different color. I can see the word "Test" and it's blue, but the background doesn't change at all. How can I get it to show?
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bash string equality [duplicate]
... bash , what's the difference, if any, between the equal and double equal test operators?
1 Answer
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How to remove not null constraint in sql server using query
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Remove constraint not null to null
ALTER TABLE 'test' CHANGE COLUMN 'testColumn' 'testColumn' datatype NULL;
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Is there a MessageBox equivalent in WPF?
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In WPF it seems this code,
System.Windows.Forms.MessageBox.Show("Test");
is replaced with:
System.Windows.MessageBox.Show("Test");
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get path for my .exe [duplicate]
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This does not work in a Unit Test project. GetEntryAssembly() is null.
– Eric J.
Apr 26 '13 at 21:43
11
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Compile (but do not run) a Python script [duplicate]
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One way is to do something like this (for test.py):
python -c "__import__('compiler').parse(open('test.py').read())"
This works for Python 2.x.
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PHP prepend leading zero before single digit number, on-the-fly [duplicate]
PHP - Is there a quick, on-the-fly method to test for a single character string, then prepend a leading zero?
3 Answers
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