IMapTKey, TValueReplace Method (TKey, TValue)Hazelcast .Net Client Class Library
Replaces the entry for a key only if currently mapped to some value.

Namespace: Hazelcast.Core
Assembly: Hazelcast.Net (in Hazelcast.Net.dll) Version: 3.5.0.6
Syntax

TValue Replace(
	TKey key,
	TValue value
)

Parameters

key
Type: TKey
key
value
Type: TValue
value

Return Value

Type: TValue
previous value associated with key or null if there was no mapping for key .
Remarks

Replaces the entry for a key only if currently mapped to some value. This is equivalent to
if (map.ContainsKey(key))
    return map.put(key, value);
else 
    return null;
> except that the action is performed atomically.

Warning:

This method uses GetHashCode and Equals of binary form of the key, not the actual implementations of GetHashCode and Equals defined in key's class.
See Also

Reference