ReadOnlyCollection<T>.IndexOf(T) Method

Reference

Definition

Namespace:: System.Collections.ObjectModel

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: ReadOnlyCollection.cs

Source:: ReadOnlyCollection.cs

Source:: ReadOnlyCollection.cs

Important

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Searches for the specified object and returns the zero-based index of the first occurrence within the entire ReadOnlyCollection<T>.

public:
 virtual int IndexOf(T value);

public int IndexOf (T value);

abstract member IndexOf : 'T -> int
override this.IndexOf : 'T -> int

Public Function IndexOf (value As T) As Integer

Parameters

value: T

The object to locate in the List<T>. The value can be null for reference types.

Returns

Int32

The zero-based index of the first occurrence of item within the entire ReadOnlyCollection<T>, if found; otherwise, -1.

Implements

IndexOf(T)

Remarks

The ReadOnlyCollection<T> is searched forward starting at the first element and ending at the last element.

This method determines equality using the default comparer EqualityComparer<T>.Default.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Applies to

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