C# Enumerable Empty
Description
Returns an empty IEnumerable that has the specified type argument.
Syntax
public static IEnumerable<TResult> Empty<TResult>()
Parameters
TResult- The type to assign to the type parameter of the returned generic IEnumerable.
Returns
Returns an empty IEnumerable that has the specified type argument.
Example
The following code example demonstrates a possible application of the Empty() method.
/*from w w w.j ava 2 s . c om*/
using System;
using System.Linq;
using System.Collections.Generic;
public class MainClass{
public static void Main(String[] argv){
string[] names1 = { "A" };
string[] names2 = { "B", "C","D", "Java" };
string[] names3 = { "XML", "C#","VB","HTML", "Javascript" };
List<string[]> namesList = new List<string[]> { names1, names2, names3 };
IEnumerable<string> allNames =namesList.Aggregate(Enumerable.Empty<string>(),
(current, next) => next.Length > 3 ? current.Union(next) : current);
foreach (string name in allNames)
{
Console.WriteLine(name);
}
}
}
The code above generates the following result.
