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ConcurrentDictionary<TKey, TValue>::GetOrAdd Method (TKey, TValue)
.NET Framework (current version)
Adds a key/value pair to the ConcurrentDictionary<TKey, TValue> if the key does not already exist.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- key
-
Type:
TKey
The key of the element to add.
- value
-
Type:
TValue
the value to be added, if the key does not already exist
Return Value
Type: TValueThe value for the key. This will be either the existing value for the key if the key is already in the dictionary, or the new value if the key was not in the dictionary.
| Exception | Condition |
|---|---|
| ArgumentNullException | key is null. |
| OverflowException | The dictionary already contains the maximum number of elements (MaxValue). |
Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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