Returns the zero-based index of the first occurrence of the specified System.Xml.Serialization.XmlArrayItemAttribute in the collection or -1 if the attribute is not found in the collection.
- attribute
The System.Xml.Serialization.XmlArrayItemAttribute to locate in the collection.
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The first index of the System.Xml.Serialization.XmlArrayItemAttribute in the collection or -1 if the attribute is not found in the collection.