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Dictionary<TKey, TValue>.Count Property

Gets the number of key/value pairs contained in the Dictionary<TKey, TValue>.

Namespace:  System.Collections.Generic
Assemblies:   mscorlib (in mscorlib.dll)
  System.Collections (in System.Collections.dll)

public int Count { get; }

Property Value

Type: System.Int32
The number of key/value pairs contained in the Dictionary<TKey, TValue>.

Implements

ICollection<T>.Count
ICollection.Count
IReadOnlyCollection<T>.Count

The capacity of a Dictionary<TKey, TValue> is the number of elements that the Dictionary<TKey, TValue> can store. The Count property is the number of elements that are actually in the Dictionary<TKey, TValue>.

The capacity is always greater than or equal to Count. If Count exceeds the capacity while adding elements, the capacity is increased by automatically reallocating the internal array before copying the old elements and adding the new elements.

Getting the value of this property is an O(1) operation.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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