default

new DateTime() vs default(DateTime)

核能气质少年 提交于 2019-12-03 01:18:09
问题 Is there a reason to choose one of these over the other? DateTime myDate = new DateTime(); or DateTime myDate = default(DateTime); Both of them are equal 1/1/0001 12:00:00 AM . 回答1: No, they are identical. default() , for any value type ( DateTime is a value type) will always call the parameterless constructor. 回答2: If you want to use default value for a DateTime parameter in a method, you can only use default(DateTime). The following line will not compile: private void MyMethod(DateTime

Boostrap multiselect select all checked by default

萝らか妹 提交于 2019-12-03 01:17:50
i use bootstrap-multiselect (v0.9.8) with option includeSelectAllOption: true it is posible that select all to be checked by default when page is loaded? thx. The following is taken from http://davidstutz.github.io/bootstrap-multiselect/ , and I am currently using this solution with bootstrap 3.3.1 and bootstrap-multiselect v0.9.8 Be sure to add the false parameter to the 'selectAll' function as that permits you to select all the options without first opening the dropdown. Example HTML: <select class="multiselect" id="my-multi-select" name="options[]" multiple="multiple"> <option>1</option>

WPF: reverting brush to default/original

ε祈祈猫儿з 提交于 2019-12-03 01:09:51
I'm a complete newbie at WPF. At the moment I'm making a usercontrol for form elements called "LabeledTextbox" which contains a label, a textbox and a textblock for errormessages. When the using code adds an errormessage, I want to put the border of the textbox in red. But, when the errormessage gets removed, I'd like to turn back to the default bordercolor of the textbox. I feel there must be a very easy way to do this. My code: (in public partial class LabeledTextbox : UserControl) public string ErrorMessage { set { if (string.IsNullOrEmpty(value)) { _textbox.BorderBrush = Brushes.Black; /

How do I set the default schema for a user in MySQL

情到浓时终转凉″ 提交于 2019-12-03 00:56:51
Is there a way to set a default schema for each user in MySQL and if so how? Where user x would default to schema y and user z would default to schema a. There is no default database for user. There is default database for current session. You can get it using DATABASE() function - SELECT DATABASE(); And you can set it using USE statement - USE database1; You should set it manually - USE db_name , or in the connection string. If your user has a local folder e.g. Linux, in your users home folder you could create a .my.cnf file and provide the credentials to access the server there. for example:

iOS - Allow default row movement in `UITableView` without editing mode

本秂侑毒 提交于 2019-12-03 00:41:49
I want to allow the default row movement in a UITableView without it being in editing mode, and without compromising the default behaviour of the UITableView . The image above displays a cell in editing mode, with movement enabled. I tried simply running for (UIView *subview in cell.subviews) (while my UITableView was in editing mode), but the button didn't turn up: <UITableViewCellScrollView: 0x8cabd80; frame = (0 0; 320 44); autoresize = W+H; gestureRecognizers = <NSArray: 0x8c9ba20>; layer = <CALayer: 0x8ca14b0>; contentOffset: {0, 0}> How can allow/add the movement "button" without

Which encoding does Java uses UTF-8 or UTF-16?

ⅰ亾dé卋堺 提交于 2019-12-03 00:37:45
I've already read the following posts: What is the Java's internal represention for String? Modified UTF-8? UTF-16? https://docs.oracle.com/javase/8/docs/api/java/lang/String.html Now consider the code given below: public static void main(String[] args) { printCharacterDetails("最"); } public static void printCharacterDetails(String character){ System.out.println("Unicode Value for "+character+"="+Integer.toHexString(character.codePointAt(0))); byte[] bytes = character.getBytes(); System.out.println("The UTF-8 Character="+character+" | Default: Number of Bytes="+bytes.length); String

WPF : Define binding's default

扶醉桌前 提交于 2019-12-02 22:08:43
In WPF, I would like to be able to template how my bindings are applied by default. For instance, I want to write : Text="{Binding Path=PedigreeName}" But it would be as if I had typed : Text="{Binding Path=PedigreeName, Mode=TwoWay, UpdateSourceTrigger=LostFocus, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}" Any idea ? Thanks, Patrick In addition to Joe White's good answer, you could also create a class that inherits from Binding and sets the default property values you need. For instance : public class TwoWayBinding : Binding { public TwoWayBinding()

Clear laucher defaults programmatically

两盒软妹~` 提交于 2019-12-02 21:40:58
问题 I am trying to delete default laucher parameters (to let user choose another app) with android.permission.SET_PREFERRED_APPLICATIONS . I googled that this is not possible, but there is a kidzone app (http://www.kidzoneapp.com/ see youtube video) that uses this technology. I am trying now to clear defaults with pm.clearPackagePreferredActivities("com.fede.launcher"); but getting this error: 04-20 16:05:50.272: E/AndroidRuntime(6926): Caused by: java.lang.SecurityException: Neither user 10070

How do I get the default value for a field in a Django model?

喜夏-厌秋 提交于 2019-12-02 21:08:44
I have a Django model with some fields that have default values specified. I am looking to grab the default value for one of these fields for us later on in my code. Is there an easy way to grab a particular field's default value from a model? You can get the field like this: myfield = MyModel._meta.get_field_by_name('field_name') and the default is just an attribute of the field: myfield.default TheModel._meta.get_field('the_field').get_default() As of Django 1.9.x you may use: field = TheModel._meta.get_field('field_name') default_value = field.get_default() If you need the default values

How to Re-Execute Log4j “Default Initialization Procedure”?

人盡茶涼 提交于 2019-12-02 20:31:32
At runtime I often create/modify log4j Loggers, Appenders, Levels, Layouts, and time to time need to reset everything back to defaults. Log4j system has well defined Default Initialization Procedure that is executed when log4j classes are loaded into memory. Is there any way to re-execute the entire Procedure programmatically later at runtime? I found several resetConfiguration() methods in log4j documentation, but not sure if any of them will do what the Default Initialization Procedure does: BasicConfigurator.resetConfiguration(); Hierarchy.resetConfiguration(); LogManager.resetConfiguration