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LINQ Single vs First
...if it finds more than one record matching the criteria.
First will always select the first record from the list. If the query returns just 1 record, you can go with First().
Both will throw an InvalidOperationException exception if the collection is empty.
Alternatively you can use SingleOrDefau...
SqlDataAdapter vs SqlDataReader
...
If your goal is to get data using a select query on db, and only access this data at different rows, go to rpevious row, etc, then you can use the SQLDatareader and load it into a datatable using dtable.Load(rdr). Then browse up and down within this datatable. ...
How would you count occurrences of a string (actually a char) within a string?
...want to be able to search for whole strings, and not just characters:
src.Select((c, i) => src.Substring(i))
.Count(sub => sub.StartsWith(target))
Read as "for each character in the string, take the rest of the string starting from that character as a substring; count it if it starts wi...
Prevent onmouseout when hovering child element of the parent absolute div WITHOUT jQuery
...ring, but for me it also prevents the actual child from being clicked as a selection in the menu, which is the point of the menu.
– johnbakers
May 17 '15 at 9:06
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Can I hide the HTML5 number input’s spin box?
...you can just use display: none; as the only thing inside the selector
– philfreo
Sep 11 '12 at 18:19
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What is an Android PendingIntent?
... decide whether application B is trustworthy for the contact data the user selected.
– Lie Ryan
Nov 3 '14 at 10:04
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Undo git update-index --assume-unchanged
...will print all files with their status
grep '^[a-z]' will filter files and select only assume unchanged
cut -c 3- will remove status and leave only paths, cutting from the 3-rd character to the end
tr '\012' '\000' will replace end of line character (\012) to zero character (\000)
xargs -0 git updat...
Is there an eval() function in Java? [duplicate]
... Java class or method that will do what you want. Your options include:
Select and use some third-party expression evaluation library. For example JEL or any of the half dozen libraries listed here.
Wrap the expression in the Java source code for a class with an eval method, send that to the Jav...
How to check if a file contains a specific string using Bash
...matched.
(-F is specified by POSIX.)
-x, --line-regexp
Select only those matches that exactly match the whole line. (-x is specified by
POSIX.)
-q, --quiet, --silent
Quiet; do not write anything to standard output. Exit immediately with zero
status if any match...
How can I transition height: 0; to height: auto; using CSS?
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You can further refine it by selecting all child elements with * and applying other changes. Buttons should've been affected by my above code, however, if they were correctly styled with em.
– Steven Vachon
Oct 24 '...