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ConfigurationElementCollection.ThrowOnDuplicate Property

Gets a value indicating whether an attempt to add a duplicate ConfigurationElement to the ConfigurationElementCollection will cause an exception to be thrown.

Namespace:  System.Configuration
Assembly:  System.Configuration (in System.Configuration.dll)

protected virtual bool ThrowOnDuplicate { get; }

Property Value

Type: System.Boolean
true if an attempt to add a duplicate ConfigurationElement to this ConfigurationElementCollection will cause an exception to be thrown; otherwise, false.

When you add a duplicate element, an exception is thrown if the CollectionType value of the element is either AddRemoveClearMap or AddRemoveClearMapAlternate.

Note that elements with identical keys and values are not considered duplicates, and are accepted silently. Only elements with identical keys but different values are considered duplicates. For more information, see the Remarks section for the BaseAdd 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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