ImmutableSortedSet<T>::ICollection<T>::Add Method (T)
Adds the specified value to the collection.
Assembly: System.Collections.Immutable (in System.Collections.Immutable.dll)
This member is an explicit interface member implementation. It can be used only when the ImmutableSortedSet<T> instance is cast to an ICollection<T> interface.
NuGet package: System.Collections.Immutable (about immutable collections and how to install)
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