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CA1860: Avoid using 'Enumerable.Any()' extension method

  • Article
Property Value
Rule ID CA1860
Title Avoid using 'Enumerable.Any()' extension method
Category Performance
Fix is breaking or non-breaking Non-breaking
Enabled by default in .NET 8 As suggestion

Cause

Enumerable.Any is called on a type that has a Length, Count, or IsEmpty property.

Rule description

To determine whether a collection type has any elements, it's more efficient and clearer to use the Length, Count, or IsEmpty (if possible) properties than to call the Enumerable.Any method.

Any(), which is an extension method, uses language integrated query (LINQ). It's more efficient to rely on the collection's own properties, and it also clarifies intent.

Note

This rule is similar to CA1827: Do not use Count()/LongCount() when Any() can be used. However, that rule applies to the Linq Count() method, while this rule suggests using the Count property.

How to fix violations

Replace a call to Any() with a call to the collection's Length, Count, or IsEmpty property.

Example

The following code snippet shows a violation of CA1860:

bool HasElements(string[] strings)
{
    return strings.Any();
}

Function HasElements(strings As String()) As Boolean
    Return strings.Any()
End Function

The following code snippet fixes the violation:

bool HasElements(string[] strings)
{
    return strings.Length > 0;
}

Function HasElements(strings As String()) As Boolean
    Return strings.Length > 0
End Function

When to suppress warnings

It's safe to suppress this warning if performance isn't a concern.

Suppress a warning

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA1860
// The code that's violating the rule is on this line.
#pragma warning restore CA1860

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA1860.severity = none

For more information, see How to suppress code analysis warnings.