大约有 40,000 项符合查询结果（耗时：0.0498秒） [XML]
Linq: GroupBy, Sum and Count
....
I think you just want:
List<ResultLine> result = Lines
.GroupBy(l => l.ProductCode)
.Select(cl => new ResultLine
{
ProductName = cl.First().Name,
Quantity = cl.Count().ToString(),
Price = cl.Sum(c => c.Price).ToSt...
@ character before a function call
...ered Jan 4 '10 at 22:08
solidgumbysolidgumby
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...
Make maven's surefire show stacktrace in console
...is that surefire in recent versions apparently sets trimStackTrace to true by default (rendering most stack trace in failed tests useless), which is quite inconvenient.
Setting -DtrimStackTrace=false or defining
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<art...
.bashrc at ssh login
...ry with Ubuntu 12.04 LTS server, since .bashrc is sourced when you SSH in, by default.
– orokusaki
Dec 15 '12 at 2:53
...
Bootstrap control with multiple “data-toggle”
... There's some difference though: a data-toggle="tooltip" inside the main (button) element will show neatly outside of that element whereas it will overlap with that element if set inside a span wrapper.
– Benjamin
Aug 23 '15 at 9:04
...
How is “mvn clean install” different from “mvn install”?
...hanyangqu Sadly, no. clean is in a separate lifecycle, so it's not called by default.
– Powerlord
Mar 17 '15 at 16:01
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What is the difference between an ORM and an ODM?
...planation! I am still not clear if ODM/ORM are abstraction layers provided by the underlying database or by the driver libraries, or are they a separate layer between the driver and the DB? Can there be an ORM driver for a Document Database and vice versa?
– pooya13
...
How to set UICollectionViewDelegateFlowLayout?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
What is resource-ref in web.xml used for?
...
You can always refer to resources in your application directly by their JNDI name as configured in the container, but if you do so, essentially you are wiring the container-specific name into your code. This has some disadvantages, for example, if you'll ever want to change the name late...
Calling constructor from other constructor in same class
...nt:
private Test(bool a, int b)
{
// ... remember that this is called by the public constructor
// with `this(...`
if (hasValue(this.C))
{
// ...
}
this.A = a;
this.B = b;
}
Above, I have added a bogus function call that determines whether property C has ...