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LINQ Group By into a Dictionary Object
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answered Jun 15 '11 at 17:42
Yuriy FaktorovichYuriy Faktorovich
59.8k1313 gold badges9999 silver badges133133 bronze badges
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SQL UPDATE all values in a field with appended string CONCAT not working
...; select * from t;
+------+-------+
| id | data |
+------+-------+
| 1 | max |
| 2 | linda |
| 3 | sam |
| 4 | henry |
+------+-------+
4 rows in set (0.02 sec)
mysql> update t set data=concat(data, 'a');
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnin...
Difference between “git checkout ” and “git checkout -- ”
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216
The special "option" -- means "treat every argument after this point as a file name, no matter ...
Rsync copy directory contents but not directory itself
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196
Try rsync -av ~/foo/ user@remote.com:/var/www/bar/
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How do I stop a Git commit when VI is on the screen waiting for a commit message?
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edited May 11 '15 at 13:15
answered Dec 1 '10 at 11:21
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Renaming a branch while on pull request
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119
"Renaming" a remote branch in git, as indicated by the link you provided, is really just delet...
Undoing a git bisect mistake
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210
From the git-bisect documentation:
Bisect log and bisect replay
After having marked re...
Convert a string to regular expression ruby
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150
Looks like here you need the initial string to be in single quotes (refer this page)
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How do I force detach Screen from another SSH session?
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edited Jul 8 '15 at 18:39
lazyreader
4888 bronze badges
answered May 2 '14 at 21:10
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Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
...essing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way to do this is to use TryGetValue
obj item;
if(!dict.TryGetValue(name, out item))
return null;
return item;
This accesses the dictionary only once instead of twice.
If you really want...