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Simple state machine example in C#?
... readonly Action PressSwitch;
[Trigger]
public readonly Action GotError;
// Actual state machine logic
protected override IEnumerable WalkStates()
{
off:
Console.WriteLine("off.");
yield return null;
if (Trigge...
Difference between res.send and res.json in Express.js
What is actual difference between res.send and res.json as both seems to perform same operation of responding to client.
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Angular IE Caching issue for $http
...omments
// because previous version of code introduced browser-related errors
//disable IE ajax request caching
$httpProvider.defaults.headers.get['If-Modified-Since'] = 'Mon, 26 Jul 1997 05:00:00 GMT';
// extra
$httpProvider.defaults.headers.get['Cache-Control'] = 'no-cache';
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What's the difference between subprocess Popen and call (how can I use them)?
I want to call an external program from Python. I have used both Popen() and call() to do that.
2 Answers
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What is the difference between syntax and semantics in programming languages?
...ement has no meaning (according to the C language rules) and thus it is an error even though the statement is syntactically correct.
If x is a pointer to some data type, the meaning of the statement is to "add sizeof(some data type) to the value at address x and store the result into the location at...
Spring Boot Rest Controller how to return different HTTP status codes?
... pass the int-value into response.setStatus. Also this perfectly works for error-handling using @ExceptionHandler.
– Igor
Apr 6 '18 at 11:41
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There is already an open DataReader associated with this Command which must be closed first
I have this query and I get the error in this function:
18 Answers
18
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Type or namespace name does not exist [closed]
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+1 to this. Horribly misleading error message. Probably saved me hours of trying to figure it out. Hey Microsoft how about "unable to import namespace BLAH because BLAH is an incompatible version" but then I guess it would have robbed Nathan of 184 upvote...
How to detect a loop in a linked list?
Say you have a linked list structure in Java. It's made up of Nodes:
25 Answers
25
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add column to mysql table if it does not exist
...uld be to just try the ALTER TABLE ADD COLUMN command. It should throw an error if the column already exists.
ERROR 1060 (42S21): Duplicate column name 'newcolumnname'
Catch the error and disregard it in your upgrade script.
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