System.Collections.Hashtable.ContainsValue Method

Determines whether the Hashtable contains a specific value.


public virtual bool ContainsValue (object value)


The value to locate in the Hashtable. The value can be null.


true if the Hashtable contains an element with the specified value; otherwise, false.


The values of the elements of the Hashtable are compared to the specified value using the object.Equals(object) method.

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

Starting with the .NET Framework 2.0, this method uses the collection’s objects’ object.Equals(object) and IComparable.CompareTo(object) methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the object.Equals(object) and IComparable.CompareTo(object) methods of the item parameter on the objects in the collection.


Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0,,