SiteMapNodeCollection::ReadOnly Method
Returns a read-only collection that contains the nodes in the specified SiteMapNodeCollection collection.
Assembly: System.Web (in System.Web.dll)
Parameters
- collection
- Type: System.Web::SiteMapNodeCollection
The SiteMapNodeCollection that contains the SiteMapNode objects to add to the read-only SiteMapNodeCollection.
Return Value
Type: System.Web::SiteMapNodeCollectionA read-only SiteMapNodeCollection with the same SiteMapNode elements and structure as the original SiteMapNodeCollection.
| Exception | Condition |
|---|---|
| ArgumentNullException | collection is nullptr. |
You can test whether a SiteMapNodeCollection collection is read-only by checking the IsReadOnly property. The IsFixedSize property also returns true when a SiteMapNodeCollection is read-only.
Notes to Implementers:A read-only SiteMapNodeCollection collection supports read and search operations, but does not support the Add, AddRange, Clear, Insert, Remove, and RemoveAt methods, nor the setter on the default indexer property, Item.
The following code example demonstrates how to use the IsReadOnly property to test whether a SiteMapNodeCollection collection is read-only or modifiable. If siteNodes is modifiable, MoveNode is called on it; otherwise, a clone SiteMapNodeCollection is created, using siteNodes as a base.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.