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Creating a URL in the controller .NET MVC
...lper:
UrlHelper u = new UrlHelper(this.ControllerContext.RequestContext);
string url = u.Action("About", "Home", null);
if you want to create a hyperlink:
string link = HtmlHelper.GenerateLink(this.ControllerContext.RequestContext, System.Web.Routing.RouteTable.Routes, "My link", "Root", "About"...
JQuery .on() method with multiple event handlers to one selector
...e:
$("table.planning_grid").on({
mouseenter: function() {
// Handle mouseenter...
},
mouseleave: function() {
// Handle mouseleave...
},
click: function() {
// Handle click...
}
}, "td");
...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
...y this, it will work for sure.
When writing Rails migrations to convert a string column to an integer you'd usually say:
change_column :table_name, :column_name, :integer
However, PostgreSQL will complain:
PG::DatatypeMismatch: ERROR: column "column_name" cannot be cast automatically to type i...
How to find Unused Amazon EC2 Security groups
...AWS CLI tool, I found an easy way to get what I need:
First, get a list of all security groups
aws ec2 describe-security-groups --query 'SecurityGroups[*].GroupId' --output text | tr '\t' '\n'
Then get all security groups tied to an instance, then piped to sort then uniq:
aws ec2 describe-instance...
How to check if a json key exists?
...p://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
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PHP Timestamp into DateTime
...
You don't need to turn the string into a timestamp in order to create the DateTime object (in fact, its constructor doesn't even allow you to do this, as you can tell). You can simply feed your date string into the DateTime constructor as-is:
// Assu...
Android: How to change the ActionBar “Home” Icon to be something other than the app icon?
...
<application
android:icon="@drawable/launcher"
android:label="@string/app_name"
android:name="com..."
android:theme="@style/Theme">...</Application>
In styles.xml: (See android:icon)
<style name="Theme" parent="@android:style/Theme.Holo.Light">
<item name...
How to find nth occurrence of character in a string?
...
If your project already depends on Apache Commons you can use StringUtils.ordinalIndexOf, otherwise, here's an implementation:
public static int ordinalIndexOf(String str, String substr, int n) {
int pos = str.indexOf(substr);
while (--n > 0 && pos != -1)
pos...
What is the difference between IEqualityComparer and IEquatable?
...
A better example would be comparisons between strings. It makes sense to have a string comparison method which regards strings as equal only if they contain the same sequence of bytes, but there are other useful comparison methods which also constitute equivalence relat...
How to convert from System.Enum to base integer?
...responding integer value, without casting and preferably without parsing a string.
8 Answers
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