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Group by in LINQ
... p in persons
group p.car by p.PersonId into g
select new { PersonId = g.Key, Cars = g.ToList() };
Or as a non-query expression:
var results = persons.GroupBy(
p => p.PersonId,
p => p.car,
(key, g) => new { PersonId = key, Cars = g.ToList() });
...
LINQ Using Max() to select a single row
I'm using LINQ on an IQueryable returned from NHibernate and I need to select the row with the maximum value(s) in a couple of fields.
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Concatenating null strings in Java [duplicate]
...ly reference values need to be considered. If the reference is null, it is converted to the string "null" (four ASCII characters n, u, l, l). Otherwise, the conversion is performed as if by an invocation of the toString method of the referenced object with no arguments; but if the result of invoking...
Git in Visual Studio - add existing project?
...
Just right click on your solution and select Add to source control. Then select Git.
Now your projects has been added to a local source control. Right click on one of your files and select Commit.
Then enter a commit message and select Commit. Then select Sync ...
How to change the blue highlight color of a UITableViewCell?
I'm wondering how to change the blue highlight/selection color of a UITableViewCell , any ideas?
11 Answers
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如何获取IE (控件)的所有链接（包括Frameset, iframe） - 其他 - 清泛IT社...
...LWindow2 -> IID_IWebBrowserApp -> IHTMLWindow2 绕过了限制。
// Converts a IHTMLWindow2 object to a IHTMLDocument2. Returns NULL in case of failure.
// It takes into account accessing the DOM across frames loaded from different domains.
CComQIPtr<IHTMLDocument2> HtmlWindowToHtmlDocu...
Grouped LIMIT in PostgreSQL: show the first N rows for each group?
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New solution (PostgreSQL 8.4)
SELECT
*
FROM (
SELECT
ROW_NUMBER() OVER (PARTITION BY section_id ORDER BY name) AS r,
t.*
FROM
xxx t) x
WHERE
x.r <= 2;
sha...
The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
...StringUtils#join also works on an Iterable, so there's probably no need to convert your collection to an array first.
– Roy
Apr 21 '15 at 7:47
add a comment
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Visual Studio : short cut Key : Duplicate Line
...ure is now built-in in VS2017: Ctrl + E, V duplicates a line if nothing is selected, or duplicates selection. You can assign it to a different key combination, or find it in the menu:
See this reference for more information.
Pre VS2017, built-in method using clipboard
As @cand mentioned, you ca...
How to get equal width of input and select fields
On the form, I have one select and two input fields. These elements are vertically aligned. Unfortunately, I can't get equal width of these elements.
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