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HttpApplicationState Class

Enables sharing of global information across multiple sessions and requests within an ASP.NET application.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public sealed class HttpApplicationState : NameObjectCollectionBase

The HttpApplicationState type exposes the following members.

  NameDescription
Public propertyAllKeysGets the access keys in the HttpApplicationState collection.
Public propertyContentsGets a reference to the HttpApplicationState object.
Public propertyCountGets the number of objects in the HttpApplicationState collection. (Overrides NameObjectCollectionBase.Count.)
Protected propertyIsReadOnlyGets or sets a value indicating whether the NameObjectCollectionBase instance is read-only. (Inherited from NameObjectCollectionBase.)
Public propertyItem[Int32]Gets a single HttpApplicationState object by index.
Public propertyItem[String]Gets the value of a single HttpApplicationState object by name.
Public propertyKeysGets a NameObjectCollectionBase.KeysCollection instance that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Public propertyStaticObjectsGets all objects declared by an <object> tag where the scope is set to "Application" within the ASP.NET application.
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  NameDescription
Public methodAddAdds a new object to the HttpApplicationState collection.
Protected methodBaseAddAdds an entry with the specified key and value into the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseClearRemoves all entries from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGet(Int32)Gets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGet(String)Gets the value of the first entry with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGetAllKeysReturns a String array that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGetAllValues()Returns an Object array that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGetAllValues(Type)Returns an array of the specified type that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseGetKeyGets the key of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseHasKeysGets a value indicating whether the NameObjectCollectionBase instance contains entries whose keys are not null. (Inherited from NameObjectCollectionBase.)
Protected methodBaseRemoveRemoves the entries with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseRemoveAtRemoves the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseSet(Int32, Object)Sets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Protected methodBaseSet(String, Object)Sets the value of the first entry with the specified key in the NameObjectCollectionBase instance, if found; otherwise, adds an entry with the specified key and value into the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Public methodClearRemoves all objects from an HttpApplicationState collection.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGet(Int32)Gets an HttpApplicationState object by numerical index.
Public methodGet(String)Gets an HttpApplicationState object by name.
Public methodGetEnumeratorReturns an enumerator that iterates through the NameObjectCollectionBase. (Inherited from NameObjectCollectionBase.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetKeyGets an HttpApplicationState object name by index.
Public methodGetObjectDataImplements the ISerializable interface and returns the data needed to serialize the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodLockLocks access to an HttpApplicationState variable to facilitate access synchronization.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodOnDeserializationImplements the ISerializable interface and raises the deserialization event when the deserialization is complete. (Inherited from NameObjectCollectionBase.)
Public methodRemoveRemoves the named object from an HttpApplicationState collection.
Public methodRemoveAllRemoves all objects from an HttpApplicationState collection.
Public methodRemoveAtRemoves an HttpApplicationState object from a collection by index.
Public methodSetUpdates the value of an object in an HttpApplicationState collection.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodUnLockUnlocks access to an HttpApplicationState variable to facilitate access synchronization.
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  NameDescription
Explicit interface implemetationPrivate methodICollection.CopyToCopies the entire NameObjectCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from NameObjectCollectionBase.)
Explicit interface implemetationPrivate propertyICollection.IsSynchronizedGets a value indicating whether access to the NameObjectCollectionBase object is synchronized (thread safe). (Inherited from NameObjectCollectionBase.)
Explicit interface implemetationPrivate propertyICollection.SyncRootGets an object that can be used to synchronize access to the NameObjectCollectionBase object. (Inherited from NameObjectCollectionBase.)
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An ASP.NET application is the sum of all files, pages, handlers, modules, and code within the scope of a virtual directory and its subdirectories on a single Web server.

A single instance of an HttpApplicationState class is created the first time a client requests any URL resource from within a particular ASP.NET application virtual directory. A separate single instance is created for each ASP.NET application on a Web server. A reference to each instance is then exposed via the intrinsic Application object.

Application state is not shared across either a Web farm (in which an application is hosted across multiple servers) or a Web garden (in which an application is hosted across multiple processes on the same computer).

TopicLocation
How to: Save Values in Application StateBuilding ASP .NET Web Applications
How to: Read Values from Application StateBuilding ASP .NET Web Applications
How to: Save Values in Application StateBuilding ASP .NET Web Applications
How to: Read Values from Application StateBuilding ASP .NET Web Applications

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

This type is thread safe.

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