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X509Certificate2Collection.Contains Method (X509Certificate2)

Determines whether the X509Certificate2Collection object contains a specific certificate.

Namespace:  System.Security.Cryptography.X509Certificates
Assembly:  System (in System.dll)

public bool Contains(
	X509Certificate2 certificate
)

Parameters

certificate
Type: System.Security.Cryptography.X509Certificates.X509Certificate2

The X509Certificate2 object to locate in the collection.

Return Value

Type: System.Boolean
true if the X509Certificate2Collection contains the specified certificate; otherwise, false.

ExceptionCondition
ArgumentNullException

certificate is null.

This method performs a linear search; therefore, the average execution time is proportional to the Count property. That is, this method is an O(n) operation, where n is Count.

This method determines equality by calling the Object.Equals method.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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