ReadOnlyCollection(Of T).IndexOf Method
Searches for the specified object and returns the zero-based index of the first occurrence within the entire ReadOnlyCollection(Of T).
Assembly: mscorlib (in mscorlib.dll)
Return ValueType: System.Int32
The zero-based index of the first occurrence of item within the entire ReadOnlyCollection(Of T), if found; otherwise, -1.
The ReadOnlyCollection(Of T) is searched forward starting at the first element and ending at the last element.
This method determines equality using the default comparer EqualityComparer(Of T).Default.
This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.