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Distinct not working with LINQ to Objects
...ithout implementing IEquatable, Equals and GetHashCode is to use the LINQs GroupBy method and to select the first item from the IGrouping.
var temp = books.SelectMany(book => book.Authors)
.GroupBy (y => y.FirstName + y.LastName )
.Select (y => y.First ());
...
Squid做透明代理，3.0以上不支持--enable-auth=\"basic,nltm\"配置项了吗？...
...cal squid --enable-auth="basic,ntlm" --enable-external-acl-helpers="wbinfo_group" --enable-arp-acl..../configure --prefix=/usr/local/squid --enable-auth="basic,ntlm" --enable-external-acl-helpers="wbinfo_group" --enable-arp-acl
在2.7可以configure 完成，在3.0以上有问题，报“configure...
Android notification is not showing
...nantaPrasad CHANNEL_ID is meant to be an identifier for you. It's what you group notifications by, like a chat conversation or group chat.
– Casey Daniel
Mar 13 '19 at 13:44
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Xcode 6 Bug: Unknown class in Interface Builder file
...n" of the file showed a path "Relative to Project" instead of "Relative to Group". Removing the file reference AND the group and re-adding it in the project root worked for me.
– knl
Oct 20 '14 at 20:14
...
Open link in new tab or window [duplicate]
...tings). Typing anything except one of the ones below will create a new tab group (I'm not sure how these work):
_blank Opens the linked document in a new window or tab
_self Opens the linked document in the same frame as it was clicked (this is default)
_parent Opens the linked document in the p...
What is WebKit and how is it related to CSS?
...
-webkit- is simply a group that Chrome, Safari, Opera and iOS browsers fit into. They all have a common ancestor, so often their capabilities/limitations (when it comes to running CSS and Javascript) are confined to the group.
A developer will p...
Using column alias in WHERE clause of MySQL query produces an error
...
You can only use column aliases in GROUP BY, ORDER BY, or HAVING clauses.
Standard SQL doesn't allow you to
refer to a column alias in a WHERE
clause. This restriction is imposed
because when the WHERE code is
executed, the column value may not yet...
What is the difference between partitioning and bucketing a table in Hive ?
...Effective for low volume data for a given partition. But some queries like group by on high volume of data still take long time to execute. e.g. Grouping of population of China will take long time compared to grouping of population in Vatican city. Partition is not solving responsiveness problem in ...
Regular Expression for alphanumeric and underscores
...s well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter
0-9 : any digit
_ : underscore
] : end of character group
* : zero or more of the given characters
$ : end of string
If you don't want to allow empty strings, use ...
A CSS selector to get last visible div
...
It works for me in a css file like this .btn-group > .btn.d-none + .btn (used for bootstrap's input groups"
– Jean-Charbel VANNIER
Jul 25 '19 at 9:03
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