.NET Framework Tutorial => Single

Download .NET Framework (PDF)

Fastest Entity Framework Extensions

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);

PDF - Download .NET Framework for free

Previous Next

Get monthly updates about new articles, cheatsheets, and tricks.