| Overload | Description |
|---|---|
| IndexOf(String) | Returns the index of the item in the collection that has the passed in key or -1 if the key is not found. |
| IndexOf(IKeyedObject) | Returns the index of the item in the collection |
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2