HttpApplicationState Class

Reference

Definition

Namespace:: System.Web

Assembly:: System.Web.dll

Important

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

public ref class HttpApplicationState sealed : System::Collections::Specialized::NameObjectCollectionBase

public sealed class HttpApplicationState : System.Collections.Specialized.NameObjectCollectionBase

type HttpApplicationState = class
    inherit NameObjectCollectionBase

Public NotInheritable Class HttpApplicationState
Inherits NameObjectCollectionBase

Inheritance: Object

NameObjectCollectionBase
HttpApplicationState

Remarks

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).

Properties

AllKeys	Gets the access keys in the HttpApplicationState collection.
Contents	Gets a reference to the HttpApplicationState object.
Count	Gets the number of objects in the HttpApplicationState collection.
IsReadOnly	Gets or sets a value indicating whether the NameObjectCollectionBase instance is read-only. (Inherited from NameObjectCollectionBase)
Item[Int32]	Gets a single HttpApplicationState object by index.
Item[String]	Gets the value of a single HttpApplicationState object by name.
Keys	Gets a NameObjectCollectionBase.KeysCollection instance that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
StaticObjects	Gets all objects declared by an `<object>` tag where the scope is set to "Application" within the ASP.NET application.

Methods

Add(String, Object)	Adds a new object to the HttpApplicationState collection.
BaseAdd(String, Object)	Adds an entry with the specified key and value into the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseClear()	Removes all entries from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGet(Int32)	Gets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGet(String)	Gets the value of the first entry with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGetAllKeys()	Returns a String array that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGetAllValues()	Returns an Object array that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGetAllValues(Type)	Returns an array of the specified type that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseGetKey(Int32)	Gets the key of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseHasKeys()	Gets a value indicating whether the NameObjectCollectionBase instance contains entries whose keys are not `null`. (Inherited from NameObjectCollectionBase)
BaseRemove(String)	Removes the entries with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseRemoveAt(Int32)	Removes the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseSet(Int32, Object)	Sets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
BaseSet(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)
Clear()	Removes all objects from an HttpApplicationState collection.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Get(Int32)	Gets an HttpApplicationState object by numerical index.
Get(String)	Gets an HttpApplicationState object by name.
GetEnumerator()	Returns an enumerator that iterates through the NameObjectCollectionBase. (Inherited from NameObjectCollectionBase)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetKey(Int32)	Gets an HttpApplicationState object name by index.
GetObjectData(SerializationInfo, StreamingContext)	Obsolete. Implements the ISerializable interface and returns the data needed to serialize the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase)
GetType()	Gets the Type of the current instance. (Inherited from Object)
Lock()	Locks access to an HttpApplicationState variable to facilitate access synchronization.
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnDeserialization(Object)	Implements the ISerializable interface and raises the deserialization event when the deserialization is complete. (Inherited from NameObjectCollectionBase)
Remove(String)	Removes the named object from an HttpApplicationState collection.
RemoveAll()	Removes all objects from an HttpApplicationState collection.
RemoveAt(Int32)	Removes an HttpApplicationState object from a collection by index.
Set(String, Object)	Updates the value of an object in an HttpApplicationState collection.
ToString()	Returns a string that represents the current object. (Inherited from Object)
UnLock()	Unlocks access to an HttpApplicationState variable to facilitate access synchronization.

Explicit Interface Implementations

ICollection.CopyTo(Array, Int32)	Copies the entire NameObjectCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from NameObjectCollectionBase)
ICollection.IsSynchronized	Gets a value indicating whether access to the NameObjectCollectionBase object is synchronized (thread safe). (Inherited from NameObjectCollectionBase)
ICollection.SyncRoot	Gets an object that can be used to synchronize access to the NameObjectCollectionBase object. (Inherited from NameObjectCollectionBase)

Extension Methods

Cast<TResult>(IEnumerable)	Casts the elements of an IEnumerable to the specified type.
OfType<TResult>(IEnumerable)	Filters the elements of an IEnumerable based on a specified type.
AsParallel(IEnumerable)	Enables parallelization of a query.
AsQueryable(IEnumerable)	Converts an IEnumerable to an IQueryable.

Applies to

Thread Safety

This type is thread safe.

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