| Leadtools.Dicom.AddIn Namespace > ThreadSafeDictionary<TKey,TValue> Class : ContainsKey Method | 
'Usage Dim instance As ThreadSafeDictionary(Of TKey,TValue) Dim key As TKey Dim value As Boolean value = instance.ContainsKey(key)
| Exception | Description | 
|---|---|
| System.ArgumentNullException | key is null. |