Enumeration Extension Methods Leave feedback
LINQ Reporting Engine enables you to perform common manipulations on a sequential data through the engine’s built-in extension methods for Iterable. These extension methods mimic some extension methods of IEnumerable<T> providing the same signatures and behavior features. Thus, you can group, sort, and perform other sequential data manipulations in template expressions in a common way.
The following table describes these built-in extension methods. The following notation conventions are used within the table:
Selectorstands for a lambda function returning a value and taking an enumeration item as its single argument. See “Using Lambda Functions” for more information.ComparableSelectorstands forSelectorreturning Comparable.EnumerationSelectorstands forSelectorreturningIterable.Predicatestands forSelectorreturning a Boolean value.
Examples in the following table are given using persons and otherPersons, enumerations of instances of the Person class that is defined as follows.
public class Person
{
public String getName() { ... }
public int getAge() { ... }
public Iterable<Person> getChildren() { ... }
...
}| Extension Method | Examples and Notes |
|---|---|
| all(Predicate) | |
| any() | |
| any(Predicate) | |
| average(Selector) | |
| concat(Iterable) | |
| contains(Object) | |
| count() | |
| count(Predicate) | |
| distinct() | |
| first() | |
| first(Predicate) | |
| firstOrDefault() | |
| firstOrDefault(Predicate) | |
| groupBy(Selector) | |
| last() | |
| last(Predicate) | |
| lastOrDefault() | |
| lastOrDefault(Predicate) | |
| max(ComparableSelector) | |
| min(ComparableSelector) | |
| orderBy(ComparableSelector) | - thenBy(ComparableSelector) - thenByDescending(ComparableSelector) |
| orderByDescending(ComparableSelector) | |
| select(Selector) | |
| selectMany(EnumerationSelector) | |
| single() | |
| single(Predicate) | |
| singleOrDefault() | |
| singleOrDefault(Predicate) | |
| skip(int) | |
| skipWhile(Predicate) | |
| sum(Selector) | |
| take(int) | |
| takeWhile(Predicate) | |
| union(Iterable) | |
| where(Predicate) | |
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