HttpApplicationState Class
Enables sharing of global information across multiple sessions and requests within an ASP.NET application.
Assembly: System.Web (in System.Web.dll)
System.Collections.Specialized.NameObjectCollectionBase
System.Web.HttpApplicationState
| Name | Description | |
|---|---|---|
 | 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.(Overrides NameObjectCollectionBase.Count.) |
| 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. |
| Name | Description | |
|---|---|---|
 | Add(String, Object) | Adds a new object to the HttpApplicationState collection. |
| 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) | Implements the ISerializable interface and returns the data needed to serialize the NameObjectCollectionBase instance.(Inherited from NameObjectCollectionBase.) |
| GetType() | |
| Lock() | Locks access to an HttpApplicationState variable to facilitate access synchronization. |
| 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. |
| Name | Description | |
|---|---|---|
  | 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.) |
| Name | Description | |
|---|---|---|
| AsParallel() | Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.) |
| AsQueryable() | Overloaded. Converts an IEnumerable to an IQueryable.(Defined by Queryable.) |
| Cast<TResult>() | Casts the elements of an IEnumerable to the specified type.(Defined by Enumerable.) |
| OfType<TResult>() | Filters the elements of an IEnumerable based on a specified type.(Defined by Enumerable.) |
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).
Available since 1.1
This type is thread safe.