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Extension methods cannot be dynamically dispatched
...
You also get this error if you use uppercase @Model instead of lowercase model.
– Timothy Kanski
May 26 '16 at 2:53
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Representing null in JSON
...ifference may be significant. In many cases though, the benefits of making errors look wrong far outweighs the benefits of minor optimizations.
– Scott Smith
May 23 '16 at 21:35
11...
rails 3 validation on uniqueness on multiple attributes
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You probably want to add a custom error msg like , :message => ' is taken for this recorded date'
– laffuste
May 15 '14 at 9:01
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How to kill a child process after a given timeout in Bash?
...e same process ID (although it's probably impossible to avoid this kind of error completely).
run_with_timeout ()
{
t=$1
shift
echo "running \"$*\" with timeout $t"
(
# first, run process in background
(exec sh -c "$*") &
pid=$!
echo $pid
# the timeout shell
(sleep $t ; e...
You need to use a Theme.AppCompat theme (or descendant) with this activity
...from @MarkKeen in the comments above as I had the same problem.
I had the error stated at the top of the post and happened after I added an alert dialog. I have all the relevant style information in the manifest. My problem was cured by changing a context reference in the alert builder - I changed:...
T-SQL: Opposite to string concatenation - how to split string into multiple records [duplicate]
... How can I call this function from a select query? I get the following error: Cannot find either column "dbo" or the user-defined function or aggregate "dbo.fn_Split", or the name is ambiguous.
– Lajos Arpad
Dec 21 '12 at 15:36
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entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding relat
...r;
contextTwo.Groups.Add(group);
contextTwo.SaveChanges();
Code without error:
var context = new EntityContext();
var user = context.Users.FirstOrDefault();
var group = new Group();
group.User = user; // Be careful when you set entity properties.
// Be sure that all objects came from the same...
How do I declare a namespace in JavaScript?
...
this gives me an error in IE7. var your_namespace = (typeof your_namespace == "undefined" || !your_namespace ) ? {} : your_namespace ; works better.
– mjallday
Nov 5 '10 at 7:28
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Get average color of image via Javascript
...xt.getImageData(0, 0, width, height);
} catch(e) {
/* security error, img on diff domain */
return defaultRGB;
}
length = data.data.length;
while ( (i += blockSize * 4) < length ) {
++count;
rgb.r += data.data[i];
rgb.g += data.data[i+1];
...
How to define a two-dimensional array?
...
You can now add items to the list:
Matrix[0][0] = 1
Matrix[6][0] = 3 # error! range...
Matrix[0][6] = 3 # valid
Note that the matrix is "y" address major, in other words, the "y index" comes before the "x index".
print Matrix[0][0] # prints 1
x, y = 0, 6
print Matrix[x][y] # prints 3; be ca...