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Namespace:System.Linq
Assembly:System.Core.dll
Extends:IEnumerable<T>

Back to Standard Query Operator Index


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Introduction

The DefaultIfEmpty operator supplies a default element for an empty sequence. One use of this operator is when performing outer joins on two sequences as in the Outer Join Sample.

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Method Signatures

// 1 - Returns the source sequence, or the default(TSource) if the source sequence has no elements
public static IEnumerable<TSource> DefaultIfEmpty<TSource>(
    this IEnumerable<TSource> source)
 
// 2 - Returns the source sequence, or the defaultValue specified if the source sequence has no elements.
public static IEnumerable<TSource> DefaultIfEmpty<TSource>(
    this IEnumerable<TSource> source, 
    TSource defaultValue)



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Exceptions

Throws an ArgumentNullException if source is null

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Pseudo-code

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Loop Count

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Code Samples

TODO:Needs code sample.

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