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.
The first index of the System.Xml.Serialization.XmlArrayItemAttribute in the collection or -1 if the attribute is not found in the collection.