CacheDependency.HasChanged Property

Definition

Namespace:

System.Web.Caching

Assembly:

System.Web.dll

Gets a value indicating whether the CacheDependency object has changed.

C#

public bool HasChanged { get; }

Property Value

Boolean

true if the CacheDependency object has changed; otherwise, false. The default is false.

Examples

The following code example demonstrates using the HasChanged property to determine whether a CacheDependency changed since the previous request for an item in the Cache. The dt value passed in the start parameter is set to DateTime.Now.

C#

// Insert the cache item.
CacheDependency dep = new CacheDependency(fileName, dt);
cache.Insert("key", "value", dep);

// Check whether CacheDependency.HasChanged is true.
if (dep.HasChanged)
  Response.Write("<p>The dependency has changed.");  
else Response.Write("<p>The dependency has not changed.");

Remarks

You can add an item to an ASP.NET application's Cache with a CacheDependency. When the CacheDependency changes, the item added to the Cache is invalidated and removed from the cache. You can use this property to determine whether a CacheDependency has changed, and recreate the item in the Cache if that has occurred.

Applies to

See also

• Cache
• Insert(String, Object, CacheDependency)
• Caching Application Data