大约有 44,500 项符合查询结果（耗时：0.0544秒） [XML]
How to automatically generate N “distinct” colors?
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82
You can use the HSL color model to create your colors.
If all you want is differing hues (likel...
Quick and easy file dialog in Python?
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208
Tkinter is the easiest way if you don't want to have any other dependencies.
To show only the ...
How to read multiple text files into a single RDD?
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edited Aug 21 '19 at 23:06
ChrisWue
16.5k33 gold badges4545 silver badges7272 bronze badges
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How do I know that the UICollectionView has been loaded completely?
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62
// In viewDidLoad
[self.collectionView addObserver:self forKeyPath:@"contentSize" options:NSKeyV...
Why can I change value of a constant in javascript
...nst x = {};
x.foo = 'bar';
console.log(x); // {foo : 'bar'}
x.foo = 'bar2';
console.log(x); // {foo : 'bar2'}
and this:
const y = [];
y.push('foo');
console.log(y); // ['foo']
y.unshift("foo2");
console.log(y); // ['foo2', 'foo']
y.pop();
console.log(y); // ['foo2']
but neither of...
Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
...tiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a good rea...
how to create a Java Date object of midnight today and midnight tomorrow?
...pare against dates from today at 00:00am (midnight early this morning) to 12:00pm (midnight tonight).
19 Answers
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LINQ Using Max() to select a single row
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233
I don't see why you are grouping here.
Try this:
var maxValue = table.Max(x => x.Status)
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Set operations (union, intersection) on Swift array?
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Yes, Swift has the Set class.
let array1 = ["a", "b", "c"]
let array2 = ["a", "b", "d"]
let set1:Set<String> = Set(array1)
let set2:Set<String> = Set(array2)
Swift 3.0+ can do operations on sets as:
firstSet.union(secondSet)// Union of two sets
firstSet.intersection(secondSet)...