IList<T>.IndexOf(T) Method

Definition

Determines the index of a specific item in the IList<T>.

public int IndexOf (T item);

Parameters

item
T

The object to locate in the IList<T>.

Returns

The index of item if found in the list; otherwise, -1.

Remarks

If an object occurs multiple times in the list, the IndexOf method always returns the first instance found.

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0