SPPersistedObject Class

發行項
07/28/2014

Provides the methods for an object to automatically serialize its state, persist that state in a permanent store, retrieve it at a later time, and deserialize it back into an in-memory object.

Inheritance Hierarchy

System.Object
  Microsoft.SharePoint.Administration.SPAutoSerializingObject
    Microsoft.SharePoint.Administration.SPPersistedObject

Namespace: Microsoft.SharePoint.Administration
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online

Syntax

'Declaration
<SubsetCallableTypeAttribute(ForcePolymorphicForReturnTypes := True)> _
<GuidAttribute("3B60B328-F4D6-4902-BEC6-E904179FA246")> _
<SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel := True)> _
<SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel := True)> _
Public Class SPPersistedObject _
    Inherits SPAutoSerializingObject _
    Implements ICloneable
'Usage
Dim instance As SPPersistedObject

[SubsetCallableTypeAttribute(ForcePolymorphicForReturnTypes = true)]
[GuidAttribute("3B60B328-F4D6-4902-BEC6-E904179FA246")]
[SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel = true)]
[SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel = true)]
public class SPPersistedObject : SPAutoSerializingObject, 
    ICloneable

Remarks

The SPPersistedObject class provides a base class for all administration objects. It serializes all fields marked with the Persisted attribute to XML and writes the XML blob to the configuration database. The SPPersistedObject class contains code to serialize all its members that are base types, other persisted objects, and collections of persisted objects. Configuration data that is stored in persisted objects is automatically made available to every process on every server in the farm.

When you create a custom persisted object you must specify the default constructor for serialization.

To return an existing persisted object, use the GetObject method of the SPFarm class, or the GetChild method of the SPPersistedObject class.

Examples

The following example illustrates a custom class that inherits from the SPPersistedObject class where the Peristed attribute is used to specify fields for serialization.

<GuidAttribute("3B60B328-F4D6-4902-BEC6-E904179FA246")>
Public Class MyObject
   Inherits SPPersistedObject
   <Persisted()>  _
   Private location As String

   <Persisted()>  _
   Private url As String

   'The default constructor must be specified for serialization.
   Public Sub New()
   End Sub 'New
   
   Public Sub New(name As String, parent As SPPersistedObject)
      MyBase.New(name, parent)
   End Sub 'New

   Public Overrides ReadOnly Property DisplayName() As String
      Get
         Return Me.url
      End Get
   End Property
   
   Public Property Url() As String
      Get
         Return Me.url
      End Get
      Set
         If Me.url = value Then
            Return
         End If

         Me.url = value
      End Set
   End Property

   Public Property Location() As String
      Get
         Return Me.location
      End Get
      Set
         Me.location = value
      End Set
   End Property
End Class 'MyObject

[GuidAttribute("3B60B328-F4D6-4902-BEC6-E904179FA246")]
public class MyObject : SPPersistedObject
{
   [Persisted]
   private string location;

   [Persisted]
   private string url;

   /*The default constructor must be specified for serialization.*/
   public MyObject()
   {
   }
   public MyObject(string name, SPPersistedObject parent)
      : base(name, parent)
   {
      ;
   }

   public override string DisplayName
   {
      get
      {
         return this.url;
      }
   }

   public string Url
   {
      get { return this.url; }
      set 
      {
         if (this.url == value)
         {
            return;
          }

          this.url = value;
      }
   }

   public string Location
   {
      get { return this.location; }
      set { this.location = value; }
   }
}

After you create a MyObject persisted object as in the example, you can return it by using SPFarm.Local.GetObject(GUID).

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Inheritance Hierarchy

共用方式為

SPPersistedObject Class

Inheritance Hierarchy

Syntax

Remarks

Examples

Thread Safety

See Also

Reference

Inheritance Hierarchy

其他資源