大约有 30,000 项符合查询结果（耗时：0.0501秒） [XML]
How to determine if a record is just created or updated in after_save
...king to use this for an after_save callback.
A simpler solution is to use id_changed? (since it won't change on update) or even created_at_changed? if timestamp columns are present.
Update: As @mitsy points out, if this check is needed outside of callbacks then use id_previously_changed?. See docs...
List OrderBy Alphabetical Order
...ean an in-place sort (i.e. the list is updated):
people.Sort((x, y) => string.Compare(x.LastName, y.LastName));
If you mean a new list:
var newList = people.OrderBy(x=>x.LastName).ToList(); // ToList optional
shar...
Getting the filenames of all files in a folder [duplicate]
...irectory, and then call the getName() method to get the filename.
List<String> results = new ArrayList<String>();
File[] files = new File("/path/to/the/directory").listFiles();
//If this pathname does not denote a directory, then listFiles() returns null.
for (File file : files) {
...
When to use .First and when to use .FirstOrDefault with LINQ?
... @driis - I'd imagine we can use the mantra of the exceptional exception guideline when choosing between First and FirstOrDefault. Thanks for the clear answer.
– Metro Smurf
Jun 21 '09 at 21:21
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How to detect which one of the defined font was used in a web page?
...ty reliable way. Basically, an element is set to use a specific font and a string is set to that element. If the font set for the element does not exist, it takes the font of the parent element. So, what they do is measure the width of the rendered string. If it matches what they expected for the...
How do you pass multiple enum values in C#?
...vate static void AddEntryToList(DaysOfWeek days, DaysOfWeek match, List<string> dayList, string entryText) {
if ((days& match) != 0) {
dayList.Add(entryText);
}
}
internal static string[] EnumToArray(DaysOfWeek days) {
Li...
Removing path and extension from filename in powershell
I have a series of strings which are full paths to files. I'd like to save just the filename, without the file extension and the leading path. So from this:
...
Check if checkbox is checked with jQuery
How can I check if a checkbox in a checkbox array is checked using the id of the checkbox array?
23 Answers
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How to declare a variable in a PostgreSQL query
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This is ideal for when I have a migration script where I want to import some relational data. Obviously I won't know the sequence id the relational data is given.
– Relequestual
Feb 13 '15 at 9:...
Jenkins Host key verification failed
...tal: The remote end hung up unexpectedly
– A. M. Mérida
Mar 4 '13 at 8:40
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