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IReadOnlyDictionary<TKey, TValue>::ContainsKey Method (TKey)
.NET Framework (current version)
Determines whether the read-only dictionary contains an element that has the specified key.
Assembly: mscorlib (in mscorlib.dll)
| Exception | Condition |
|---|---|
| ArgumentNullException | key is null. |
Implementations can vary in how they determine the equality of objects; for example, the class that implements IReadOnlyDictionary<TKey, TValue> might use the Comparer<T>::Default property, or it might implement the IComparer<T> method.
Implementations can vary in whether they allow key to be null.
Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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