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Collection was modified; enumeration operation may not execute
...irectly changing the subscribers dictionary under the hood during the loop and leading to that message. You can verify this by changing
foreach(Subscriber s in subscribers.Values)
To
foreach(Subscriber s in subscribers.Values.ToList())
If I'm right, the problem will disappear.
Calling subscribers...
How do I parse a string to a float or int?
...
You should handle ValueError if you want to be safe
– Joe Bobson
Sep 9 '18 at 13:20
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Package Manager Console Enable-Migrations CommandNotFoundException only in a specific VS project
I tried to run the command 'Enable-Migrations' in a new project and I got the message:
26 Answers
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Git push error: Unable to unlink old (Permission denied)
...ll have the file opened this error will appear as well. Had the same error and that was why i was not able to push my changes in.
– Matias
Nov 3 '16 at 14:05
1
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Vagrant's port forwarding not working [closed]
... with a simple HTTP server you can use -- go to the folder with index.html and run sudo python -m SimpleHTTPServer 80, then try hitting that with curl from both boxes. If that works, then it's probably an Apache configuration issue. I don't have enough experience with Apache to help if that's the ...
text-overflow:ellipsis in Firefox 4? (and FF5)
...TextBox').val().length > limit) {
// -4 to include the ellipsis size and also since it is an index
var trimmedText = $('#limitedWidthTextBox').val().substring(0, limit - 4);
trimmedText += ellipsis;
$('#limitedWidthTextBox').val(trimmedText);
}
I understand that there should be som...
100% Min Height CSS layout
In particular if you have a layout with a header and footer of fixed height ,
13 Answers
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Is there a recommended format for multi-line imports?
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Personally I go with parentheses when importing more than one component and sort them alphabetically. Like so:
from Tkinter import (
Button,
Canvas,
DISABLED,
END,
Entry,
Frame,
LEFT,
NORMAL,
RIDGE,
Text,
Tk,
)
This has the added advantage of easily ...
How to avoid java.util.ConcurrentModificationException when iterating through and removing elements
...ould have mentioned that i remove the elements in another part of the code and not the loop itself.
– RoflcoptrException
Nov 12 '11 at 13:28
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What is an API key? [closed]
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What "exactly" an API key is used for depends very much on who issues it, and what services it's being used for. By and large, however, an API key is the name given to some form of secret token which is submitted alongside web service (or similar) requests in order to identify the origin of the req...