ReadOnlyDictionary<TKey,TValue>.IDictionary.Contains(Object) Method

Reference

Definition

Namespace:: System.Collections.ObjectModel

Assemblies:: mscorlib.dll, System.ObjectModel.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assemblies:: netstandard.dll, System.ObjectModel.dll

Assembly:: System.ObjectModel.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: ReadOnlyDictionary.cs

Source:: ReadOnlyDictionary.cs

Source:: ReadOnlyDictionary.cs

Important

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Determines whether the dictionary contains an element that has the specified key.

 virtual bool System.Collections.IDictionary.Contains(System::Object ^ key) = System::Collections::IDictionary::Contains;

bool IDictionary.Contains(object key);

abstract member System.Collections.IDictionary.Contains : obj -> bool
override this.System.Collections.IDictionary.Contains : obj -> bool

Function Contains (key As Object) As Boolean Implements IDictionary.Contains

Parameters

key: Object

The key to locate in the dictionary.

Returns

Boolean

true if the dictionary contains an element that has the specified key; otherwise, false.

Implements

Contains(Object)

Exceptions

ArgumentNullException

key is null.

Remarks

This member is an explicit interface member implementation. It can be used only when the ReadOnlyDictionary<TKey,TValue> instance is cast to an IDictionary interface.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1
UWP	10.0

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