大约有 7,700 项符合查询结果（耗时：0.0182秒） [XML]
What is the difference between -viewWillAppear: and -viewDidAppear:?
... whenever the view was loaded into memory. So for example, if my view is a form with 3 labels, I would add the labels here; the view will never exist without those forms.
2) ViewWillAppear: I use ViewWillAppear usually just to update the data on the form. So, for the example above, I would use this...
HTML5 form required attribute. Set custom validation message?
I've got the following HTML5 form: http://jsfiddle.net/nfgfP/
14 Answers
14
...
What is a NullReferenceException, and how do I fix it?
...es is null.
// There is no Dictionary to perform the lookup.
Range Variable (Indirect/Deferred)
public class Person
{
public string Name { get; set; }
}
var people = new List<Person>();
people.Add(null);
var names = from p in people select p.Name;
string fi...
Django admin: How to display a field that is marked as editable=False' in the model?
...option.
Original Answer
One way to do this would be to use a custom ModelForm in admin. This form can override the required field to make it editable. Thereby you retain editable=False everywhere else but Admin. For e.g. (tested with Django 1.2.3)
# models.py
class FooModel(models.Model):
fir...
Using the RUN instruction in a Dockerfile with 'source' does not work
... immediately follows. Because /bin/sh -c is the default shell, this "shell form" of RUN translates to RUN ["/bin/sh", "-c", "/bin/bash" "-c" "source /usr/local/bin/virtualenvwrapper.sh"]. You should go ahead and use the "exec form" of RUN so you can take the sh out like so RUN ["/bin/bash" "-c" "sou...
How to localize ASP.NET MVC application?
... MVC application very much in the same way you would a classic ASP.NET Web Form application.
You wouldn't use different pages/views for each language, but each page would support multiple languages using satellite assemblies.
You can look at Matt Hawley's blog entry for more explanation and exampl...
Python syntax for “if a or b or c but not all of them”
...
If you mean a minimal form, go with this:
if (not a or not b or not c) and (a or b or c):
Which translates the title of your question.
UPDATE: as correctly said by Volatility and Supr, you can apply De Morgan's law and obtain equivalent:
if (...
How do I show a Save As dialog in WPF?
...FileInfo file = new FileInfo("image.jpg");
var dialog = new System.Windows.Forms.SaveFileDialog();
dialog.FileName = file.Name;
dialog.DefaultExt = file.Extension;
dialog.Filter = string.Format("{0} images ({1})|*{1}|All files (*.*)|*.*",
file.Extension.Substring(1).Capitalize(),
file.Extens...
What is http multipart request?
...e server.
What it looks like
See Multipart Content-Type
See multipart/form-data
share
|
improve this answer
|
follow
|
...
Default value of a type at Runtime [duplicate]
...
For information (and because I ran into the problem), System.Void is considered a ValueType, but cause an exception on CreateInstance. If you use this code to get the default return value of a method, you'll need to consider System...