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App Inventor 2 模拟器不能正常朗读文本的解决方法 · App Inventor 2 中文网
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How can I check a C# variable is an empty string “” or null? [duplicate]
...
Since .NET 2.0 you can use:
// Indicates whether the specified string is null or an Empty string.
string.IsNullOrEmpty(string value);
Additionally, since .NET 4.0 there's a new method that goes a bit farther:
// Indicates whether a ...
How do you find the last day of the month? [duplicate]
... @BenJenkinson: It's definitely still the best way at the moment. In 2.0 you could use a DateAdjuster - there isn't one for LastDayOfMonth at the moment, but I might add one tonight :)
– Jon Skeet
Jan 30 '15 at 18:11
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Why is “using namespace std;” considered bad practice?
...from Bar without problems. But one day you upgrade to a new version of Foo 2.0, which now offers a function called Quux(). Now you've got a conflict: Both Foo 2.0 and Bar import Quux() into your global namespace. This is going to take some effort to fix, especially if the function parameters happen ...
In what cases could `git pull` be harmful?
...d decide the best course of action (merge, rebase, reset, etc.).
With Git 2.0 and newer, you can run:
git config --global pull.ff only
to alter the default behavior to only fast-forward. With Git versions between 1.6.6 and 1.9.x you'll have to get into the habit of typing:
git pull --ff-only
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Programmatically scroll a UIScrollView
...ation and style of the animation, you can do:
[UIView animateWithDuration:2.0f delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
scrollView.contentOffset = CGPointMake(x, y);
} completion:NULL];
Adjust the duration (2.0f) and options (UIViewAnimationOptionCurveLinear) to taste!
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How to generate .NET 4.0 classes from xsd?
...owever, that most of the intrinsic options here haven't changed much since 2.0
For the options, use xsd /? or see MSDN; for example /enableDataBinding can be useful.
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How do I set up email confirmation with Devise?
...atabase_authenticatable
t.confirmable
...
end
If you're using devise 2.0+ this fails because devise no longer provides migration helpers, and so t.confirmable raises an error. Instead, copy the block labeled "Confirmable" from their migration guide.
3. Generate the devise views, with either o...
UIlabel layer.cornerRadius not working in iOS 7.1
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//works perfect in Swift 2.0 for a circular or round image
@IBOutlet var theImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
//Make sure the width and height are same
self.theImage....
Convert a row of a data frame to vector
... recommend unlist, which keeps the names.
unlist(df[1,])
a b c
1.0 2.0 2.6
is.vector(unlist(df[1,]))
[1] TRUE
If you don't want a named vector:
unname(unlist(df[1,]))
[1] 1.0 2.0 2.6
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