Parameters

key

The key of the entry to locate in the current instance.

Returns

true if the current instance contains an entry with key; otherwise, false.

Exceptions

Type	Reason
ArgumentNullException	key is null.

Remarks

Operation

As described above.

This method uses Hashtable.KeyEquals(object, object) to compare key to the keys in the current instance.

Note: For the default implementation, this method has a constant (O(1)) lookup time.

Requirements

Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0