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Determines whether the Hashtable contains a specific key.
Assembly: mscorlib (in mscorlib.dll)
Return ValueType: System..::..Boolean
true if the Hashtable contains an element with the specified key; otherwise, false.
key is nullNothingnullptrunita null reference (Nothing in Visual Basic).
implements IDictionary..::..Contains. It behaves exactly as .
This method is an O(1) operation.
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see dd66cd4c-b087-415f-9c3e-94e3a1835f74.