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 IEnumerable. 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 familiar 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 IComparable.EnumerationSelectorstands forSelectorreturningIEnumerable.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 Name { get { ... } }
public int Age { get { ... } }
public IEnumerable<Person> Children { get { ... } }
...
}| Extension Method | Examples and Notes |
|---|---|
| All(Predicate) | |
| Any() | |
| Any(Predicate) | |
| Average(Selector) | |
| Concat(IEnumerable) | |
| 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) | |
| OrderByDescending(ComparableSelector) | |
| Select(Selector) | |
| SelectMany(EnumerationSelector) | |
| Single() | |
| Single(Predicate) | |
| SingleOrDefault() | |
| SingleOrDefault(Predicate) | |
| Skip(int) | |
| SkipWhile(Predicate) | |
| Sum(Selector) | |
| Take(int) | |
| TakeWhile(Predicate) | |
| Union(IEnumerable) | |
| Where(Predicate) | |
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