CacheDependency.HasChanged Property


Gets a value indicating whether the CacheDependency object has changed.

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

public bool HasChanged { get; }

Property Value

Type: System.Boolean

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

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.

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.

// 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.");

.NET Framework
Available since 1.1
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