NamespaceSystemLibrary.Common.Framework.Extensions SystemLibrary.Common.Framework.Net.dll

This class contains extension methods for IEnumerables

IEnumerableExtensions

public static class IEnumerableExtensions

Inheritance

object

IEnumerableExtensions

Examples

Arguments

X

Methods

Select items grouped by a property of your choice

public static IEnumerable<T> DistinctBy<T, TKey>(this IEnumerable<T> items, Func<T, TKey> selector) where T : class

X

class Car 
{
    public string Name;
}

var car1 = new Car { Name = "Vehicle" }
var car2 = new Car { Name = "Vehicle" }

var list = new List<Car> { car1, car2 }

var list = list.DistinctBy(x => x.Name).ToList();
// list contains now 1 car

X

Generic types

Name	Description
T
TKey

Methods arguments

Type	Name	Description
IEnumerable<T>	items
Func<T, TKey>	selector

X

Type	Description
IEnumerable<T>	IEnumerable filtered on the property of your choice

Check if the enumerable contains 'value', does not throw if value is null

Remarks

X

Uses Linq.Contains() internally

public static bool Has<T>(this IEnumerable<T> enumerable, object value) where T : class

X

var users = new List<User>();
var user = new User();

users.Add(user);

var result = users.Has(user);
// result is true, the list contains that specific user object

X

Generic types

Name	Description
T

Methods arguments

Type	Name	Description
IEnumerable<T>	enumerable
object	value

X

Type	Description
bool	Returns true or false

Check if the IEnumerable contains 'value'

Does not throw on null

Remarks

X

Uses Linq.Contains() internally, but does not throw on null

public static bool Has<T>(this IEnumerable<T> enumerable, T value) where T : IComparable, IConvertible

X

var texts = new string[] { "Hello", "World" };
var has = texts.Has("Abc");
//has is False

X

Generic types

Name	Description
T

Methods arguments

Type	Name	Description
IEnumerable<T>	enumerable
T	value

X

Type	Description
bool	Returns true or false

Checks if the Enumerable exists and has at least 1 item

Remarks

X

Does not throw exception on null

public static bool IsNot<T>(this IEnumerable<T> enumerable)

X

var list = new List<string>();

var result = list.IsNot();

// result is true as the list contains 0 items

List<string> list = null;
var result = list.IsNot();
// result is true as the list currently is null

X

Generic types

Name	Description
T

Methods arguments

Type	Name	Description
IEnumerable<T>	enumerable

X

Type	Description
bool	True or false

Checks if the Enumerable exists and has at least 1 item

Remarks

X

Does not throw exception on null

public static bool Is<T>(this IEnumerable<T> enumerable)

X

var list = new List<string>();
list.Add("hello world");

var result = list.Is();

// result is true as the list contains 1 item

List<string> list = null;
var result = list.Is();
// result is false as the list is null

X

Generic types

Name	Description
T

Methods arguments

Type	Name	Description
IEnumerable<T>	enumerable

X

Type	Description
bool	True or false

}