ICollection<T>.IsReadOnly Property

Definition

Gets a value indicating whether the ICollection<T> is read-only.

C#
public bool IsReadOnly { get; }

Property Value

true if the ICollection<T> is read-only; otherwise, false.

Remarks

A collection that is read-only does not allow the addition or removal of elements after the collection is created. Note that read-only in this context does not indicate whether individual elements of the collection can be modified, since the ICollection<T> interface only supports addition and removal operations. For example, the IsReadOnly property of an array that is cast or converted to an ICollection<T> object returns true, even though individual array elements can be modified.

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