大约有 2,253 项符合查询结果（耗时：0.0128秒） [XML]
Preserving order with LINQ
... You can map a source element by index to a result element
AsEnumerable
Cast
Concat
Select
ToArray
ToList
Preserves Order. Elements are filtered or added, but not re-ordered.
Distinct
Except
Intersect
OfType
Prepend (new in .net 4.7.1)
Skip
SkipWhile
Take
TakeWhile
Where
Zip (new in .net 4)
...
Gets byte array from a ByteBuffer in java
...gned integers, only signed ones. If you want "unsigned bytes", you need to cast as int and use a bitmask: int unsigned_byte = b[k] & 0xff; for some value of k.
– Jason S
Apr 15 '17 at 2:13
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make arrayList.toArray() return more specific types
...lass[myList.size()])?
If your list is not properly typed you need to do a cast before calling toArray. Like this:
List l = new ArrayList<String>();
String[] a = ((List<String>)l).toArray(new String[l.size()]);
...
how to show progress bar(circle) in an activity having a listview before loading the listview with d
...ists. SO, in the AsyncTask's onPreExecute() I use something like this:
// CAST THE LINEARLAYOUT HOLDING THE MAIN PROGRESS (SPINNER)
LinearLayout linlaHeaderProgress = (LinearLayout) findViewById(R.id.linlaHeaderProgress);
@Override
protected void onPreExecute() {
// SHOW THE SPINNER WHILE ...
Differences between fork and exec
...he "exec" functions to create the child process
execvp (argv[0], const_cast<char**>(argv));
} else { // This is the Parent Process
//Continue executing parent process
}
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R - Concatenate two dataframes?
... Nice. I just wanted to post the same answer :-) . One improvement: @Anton casted the NA to double in his answer. It would be nice when the type of the new column was the same type as the existing column in the other data frame. Maybe via mode(d2[d2.add[i]]) <- mode(d1[d2.add[i]]). But I am not s...
Show or hide element in React
...
!!someValue && <SomeElement /> // will render nothing as we cast the value to boolean
Reasons for using this approach instead of CSS 'display: none';
While it might be 'cheaper' to hide an element with CSS - in such case 'hidden' element is still 'alive' in react world (which migh...
How to convert SecureString to System.String?
...rtainly use the unsafe keyword and a char*, just call bstr.ToPointer() and cast.
– Ben Voigt
Jun 21 '16 at 16:23
@BenV...
SQL to determine minimum sequential days of access?
...I just didn't worry about it doing it here. It wouldn't be any faster than casting it to an int, but does have the flexibility to count hours, months, whatever.
– Rob Farley
Jul 24 '09 at 23:13
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Null coalescing in powershell
...e unwanted whitespace round it:
$name = ([string]$row.td[0]).Trim()
The cast to string protects against the element being null and prevents any risk of Trim() failing.
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