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If my interface must return Task what is the best way to have a no-operation implementation?
...mprove performance even more if you cache the already completed task since all instances of completed tasks are the same:
public static class TaskExtensions
{
public static readonly Task CompletedTask = Task.FromResult(false);
}
With TaskExtensions.CompletedTask you can use the same instance ...
生物识别使用指导 · App Inventor 2 中文网
...Initialize() {
生物识别1.AllowDeviceCredential = false
垂直布局_隐私.Visible = false
}
when 按钮_解锁.Click() {
生物识别1.Authenticate("解锁私人内容", "请验证本机身份")
}
when 生物识别1.AuthSucceeded() {
垂直布局_隐私.Visible = true
}
设备必须...
Android -Starting Service at Boot Time
...
The link to the article is dead but the sample code is all you need anyway, so +1 :)
– Alex
Jan 3 '14 at 9:50
3
...
How do I instantiate a Queue object in java?
...n't want to do this, but it's listed as an option for the sake of covering all the bases.
new Queue<Tree>() {
public Tree element() {
...
};
public boolean offer(Tree element) {
...
};
...
};
...
Why should a function have only one exit-point? [closed]
...p massively indented to the right, and it becomes very difficult to follow all the nested scopes.
Another is that you can check preconditions and exit early at the start of a method, so that you know in the body of the method that certain conditions are true, without the entire body of the method b...
How to write a caption under an image?
...line-block;
}
figcaption {
margin: 10px 0 0 0;
font-variant: small-caps;
font-family: Arial;
font-weight: bold;
color: #bb3333;
}
figure {
padding: 5px;
}
img:hover {
transform: scale(1.1);
-ms-transform: scale(1.1);
-webkit-transform: scale(1.1);
...
Use of alloc init instead of new
...
Jeremy StanleyJeremy Stanley
5,62611 gold badge2525 silver badges2121 bronze badges
...
jQuery validate: How to add a rule for regular expression validation?
... || re.test(value);
},
"Please check your input."
);
now all you need to do to validate against any regex is this:
$("#Textbox").rules("add", { regex: "^[a-zA-Z'.\\s]{1,40}$" })
Additionally, it looks like there is a file called additional-methods.js that contains the method "pa...
What does enumerable mean?
...his condition is in place because objects have many more properties, especially from inheritance:
console.log(Object.getOwnPropertyNames(Object.prototype));
// ["constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable", /* etc. */]
Each of t...
How do I format a number in Java?
...
Actually, String.format is like C's printf. It can format several kinds of data types.
– cesarse
Jul 2 '13 at 13:36
...