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ASP.NET MVC Conditional validation
...onResult> Validate(ValidationContext validationContext)
{
if (IsSenior && string.IsNullOrEmpty(Senior.Description))
yield return new ValidationResult("Description must be supplied.");
}
}
Read more at Introducing ASP.NET MVC 3 (Preview 1).
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add a string prefix to each value in a string column using Pandas
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thank you. if of interest, dataframe indexes also support such string manipulations.
– tagoma
Jul 10 '17 at 21:30
2
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Changing one character in a string
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Don't modify strings.
Work with them as lists; turn them into strings only when needed.
>>> s = list("Hello zorld")
>>> s
['H', 'e', 'l', 'l', 'o', ' ', 'z', 'o', 'r', 'l', 'd']
>>> s[6] = 'W'
>>>...
How can I determine the type of an HTML element in JavaScript?
... element name capitalized and without the angle brackets, which means that if you want to check if an element is an <div> element you could do it as follows:
elt.nodeName == "DIV"
While this would not give you the expected results:
elt.nodeName == "<div>"
...
Why CancellationToken is separate from CancellationTokenSource?
... to encourage successful patterns and discourage anti-patterns without sacrificing performance.
If the door was left open for misbehaving APIs, then the usefulness of the cancellation design could quickly be eroded.
CancellationTokenSource == "cancellation trigger", plus generates linked listene...
Pointer arithmetic for void pointer in C
... ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to data of size x is incremented, how does it get to point x bytes ahead? How does the compiler know to add x to value of the pointer?
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What is the difference between a User Control Library and a Custom Control Library?
...but more limited than a full custom control.
These controls have a small difference from a runtime point of view. When building an application and placing an UserControl into it, the control tree will have a concrete UserControl template inside of it. So if we consider a lame example of a specializ...
How to copy a file from one directory to another using PHP?
...) function :
// Will copy foo/test.php to bar/test.php
// overwritting it if necessary
copy('foo/test.php', 'bar/test.php');
Quoting a couple of relevant sentences from its manual page :
Makes a copy of the file source to
dest. If the destination
file already exists, it will be
overw...
In Django, how does one filter a QuerySet with dynamic field lookups?
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A simplified example:
In a Django survey app, I wanted an HTML select list showing registered users. But because we have 5000 registered users, I needed a way to filter that list based on query criteria (such as just people who co...
Is AngularJS just for single-page applications (SPAs)?
...e not.. that's like saying "Jquery is only for projects with animations".
If it fits your project, use it.
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