.NET Framework LINQ Single
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Example
var oneNumber = new[] {5};
var theOnlyNumber = oneNumber.Single();
Console.WriteLine(theOnlyNumber); //5
var numbers = new[] {1,2,3,4,5};
var theOnlyNumberSmallerThanTwo = numbers.Single(n => n < 2);
Console.WriteLine(theOnlyNumberSmallerThanTwo); //1
The following throws InvalidOperationException since there is more than one element in the sequence:
var theOnlyNumberInNumbers = numbers.Single();
var theOnlyNegativeNumber = numbers.Single(n => n < 0);
