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Validation failed for one or more entities while saving changes to SQL Server Database using Entity
...trings.
var errorMessages = ex.EntityValidationErrors
.SelectMany(x => x.ValidationErrors)
.Select(x => x.ErrorMessage);
// Join the list to a single string.
var fullErrorMessage = string.Join("; ", errorMessages);
// Combine the origin...
XAMPP, Apache - Error: Apache shutdown unexpectedly
...- From the XAMPP Control Panel, under Apache, click the Config button, and select the Apache (httpd.conf).
Inside the httpd.conf file, somehow I found a line that says:
Listen 80
And change the 80 into any number / port you want. In my scenario I’m using port 8080.
Listen 8080
Still from th...
What should every developer know about databases? [closed]
...fluence that choice;
The concept of coverage (why you shouldn't just write SELECT *);
The difference between a clustered and non-clustered index;
Why more/bigger indexes are not necessarily better;
Why you should try to avoid wrapping filter columns in functions.
Designers should also be aware of ...
Is there a way of making strings file-path safe in c#?
...id chars and an _ for invalid ones
var validFilename = new string(filename.Select(ch => invalidFileNameChars.Contains(ch) ? '_' : ch).ToArray());
To replace invalid characters (and avoid potential name conflict like Hell* vs Hell$):
static readonly IList<char> invalidFileNameChars = Path...
完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题 - 更多...
... if(!$_POST['tocatid']) showmessage(L('please_select_target_category'));
$tocatid = intval($_POST['tocatid']);
$modelid = $this->categorys[$tocatid]['modelid'];
if(!$modeli...
How To Get IPython Notebook To Run Python 3?
...led "root". In order to launch application using another environment, just select the desired environment from the list, to make it active.
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Specify pane percentage in tmuxinator project
...e preset layouts (such as main-vertical). From the man page:
In addition, select-layout may be used to apply a previously used layout -
the list-windows command displays the layout of each window in a form
suitable for use with select-layout. For example:
$ tmux list-windows
0: ks...
Is there a way to suppress warnings in Xcode?
... Easy way to get the warning code: go to the Log Navigator (Command+7), select the topmost build, expand the log (the '=' button on the right), and scroll to the bottom.
– Neal Ehardt
Jan 25 '12 at 16:46
...
Hidden features of Perl?
...
One of my favourite features in Perl is using the boolean || operator to select between a set of choices.
$x = $a || $b;
# $x = $a, if $a is true.
# $x = $b, otherwise
This means one can write:
$x = $a || $b || $c || 0;
to take the first true value from $a, $b, and $c, or a default of 0...
Landscape printing from HTML
...y seem to work in IE7 but this is because IE7 will remember the users last selection of landscape or portrait in print preview (only the browser is re-started).
This article does have some suggested work arounds using JavaScript or ActiveX that send keys to the users browser although it they are no...