Language

ReadOnlyCollection.IndexOf(T) Method

Definition

Namespace:
System.Collections.ObjectModel
Assemblies:
mscorlib.dll, System.Runtime.dll
Assemblies:
netstandard.dll, System.Runtime.dll
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
ReadOnlyCollection.cs
Source:
ReadOnlyCollection.cs
Source:
ReadOnlyCollection.cs
Source:
ReadOnlyCollection.cs
Source:
ReadOnlyCollection.cs

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

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. The value can be null for reference types.

Returns

Int32

The zero-based index of the first occurrence of value within the entire ReadOnlyCollection, if found; otherwise, -1.

Implements

IndexOf(T)

Remarks

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

This method determines equality using the default comparer EqualityComparer.Default.

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

Applies to

See also