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IDictionary Interface

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

Represents a nongeneric collection of key/value pairs.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

public interface IDictionary : ICollection, 

The IDictionary type exposes the following members.

Public propertyCountGets the number of elements contained in the ICollection. (Inherited from ICollection.)
Public propertyIsFixedSizeGets a value indicating whether the IDictionary object has a fixed size.
Public propertyIsReadOnlyGets a value indicating whether the IDictionary object is read-only.
Public propertyIsSynchronizedGets a value indicating whether access to the ICollection is synchronized (thread safe). (Inherited from ICollection.)
Public propertyItemGets or sets the element with the specified key.
Public propertyKeysGets an ICollection object containing the keys of the IDictionary object.
Public propertySyncRootGets an object that can be used to synchronize access to the ICollection. (Inherited from ICollection.)
Public propertyValuesGets an ICollection object containing the values in the IDictionary object.

Public methodAddAdds an element with the provided key and value to the IDictionary object.
Public methodClearRemoves all elements from the IDictionary object.
Public methodContainsDetermines whether the IDictionary object contains an element with the specified key.
Public methodCopyToCopies the elements of the ICollection to an Array, starting at a particular Array index. (Inherited from ICollection.)
Public methodGetEnumeratorReturns an enumerator that iterates through a collection. (Inherited from IEnumerable.)
Public methodRemoveRemoves the element with the specified key from the IDictionary object.

The IDictionary interface is the base interface for nongeneric collections of key/value pairs.

Each element is a key/value pair stored in a DictionaryEntry object.

Each pair must have a unique key. Implementations can vary in whether they allow the key to be null. The value can be null and does not have to be unique. The IDictionary interface allows the contained keys and values to be enumerated, but it does not imply any particular sort order.

IDictionary implementations fall into three categories: read-only, fixed-size, variable-size. A read-only IDictionary object cannot be modified. A fixed-size IDictionary object does not allow the addition or removal of elements, but does allow the modification of existing elements. A variable-size IDictionary object allows the addition, removal, and modification of elements.

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