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“Items collection must be empty before using ItemsSource.”
I'm trying to get images to display in a WPF ListView styled like a WrapPanel as described in this old ATC Avalon Team article: How to Create a Custom View .
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Seeing escape characters when pressing the arrow keys in python shell
In shells like the interactive python shell, you can usually use the arrow keys to move around in the current line or get previous commands (with arrow-up) etc.
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How to change tab size on GitHub?
...gives some more information about the embedded IDE.
However, provided you know the url of the blob (file) you're willing to review, you can switch to the edit mode easily by changing the blob segment with an edit segment and use the dropdown to select your prefered tab size.
Standard view: http...
Converting int to bytes in Python 3
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That's the way it was designed - and it makes sense because usually, you would call bytes on an iterable instead of a single integer:
>>> bytes([3])
b'\x03'
The docs state this, as well as the docstring for bytes:
>>> help(bytes)
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bytes(in...
PHP: exceptions vs errors?
...rrors are generally unrecoverable. Lets say for instance - you have a block of code that will insert a row into a database. It is possible that this call fails (duplicate ID) - you will want to have a "Error" which in this case is an "Exception". When you are inserting these rows, you can do some...
When to use MongoDB or other document oriented database systems? [closed]
...clips, photos and vector-grafics. We started with MySQL as the database backend and recently included MongoDB for storing all meta-information of the files, because MongoDB better fits the requirements. For example: photos may have Exif information, videos may have audio-tracks where we to want ...
Switching between Android Navigation Drawer image and Up caret when using fragments
...d to implementing the lower-level fragment in a new activity.
I would think that you would then have to implement the back functionality manually: when the user pressed back you have code that pops the stack (e.g. in Activity::onBackPressed override). So, wherever you do that, you can reverse the...
C# Regex for Guid
... through a string and add single quotes around each Guid value. I was thinking I could use a Regex to do this but I'm not exactly a Regex guru.
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Removing event listener which was added with bind
...ndow, 'scroll', x);
Toolbox.removeListener(window, 'scroll', x);
This works as expected for me.
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What's the @ in front of a string in C#?
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It marks the string as a verbatim string literal - anything in the string that would normally be interpreted as an escape sequence is ignored.
So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"
There is one exception: an escape...