C# Enumerable Single(IEnumerable, Func)

Description

Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.

Syntax

public static TSource Single<TSource>(
  this IEnumerable<TSource> source,
  Func<TSource, bool> predicate
)

Parameters

• TSource - The type of the elements of source.
• source - An IEnumerable to return a single element from.
• predicate - A function to test an element for a condition.

Example

The following code example demonstrates how to use Single to select the only element of an array that satisfies a condition.

// w ww  . j a  v  a2  s.co m
using System;
using System.Linq;
using System.Collections.Generic;
public class MainClass{
  public static void Main(String[] argv){  
     string[] fruits = { "apple", "banana", "mango"};

     string fruit1 = fruits.Single(fruit => fruit.Length > 3);

     Console.WriteLine(fruit1);


  }
}