DataSet serializable, diposable

DataSet serializable, diposable

System.Data (system.data.dll) class

The DataSet contains a collection of DataTable objects that define the schema and contain the data for each table ( Tables ). The DataSet also contains a collection of DataRelation objects that define the relationships between the tables ( Relations ). The DataSet references a DataViewManager that specifies how views should be created when data binding to a control ( DefaultViewManager ). The DataSet is often described as an in-memory cache of relational data.

The DataSet is the only ADO.NET object with the ability to serialize its content to an XML file (using the WriteXml( ) and WriteXmlSchema( ) methods ) or to populate itself from an existing schema or XML file (using the ReadXmlSchema( ) and ReadXml( ) methods). Alternatively, you can use GetXml( ) and GetXmlSchema( ) to retrieve the XML data and schema information as a string.

You can delete the data in a DataSet without affecting the schema (using Clear( ) ), create a duplicate DataSet with the same table structure and meta data (using Clone( ) ) or with the same structure and content (using Copy( ) ), merge two DataSet objects (using Merge( ) ), or check the entire DataSet for errors (using HasErrors ).

One of the most important features of the DataSet is its version-tracking ability. By default, each DataRow object in the DataSet stores enough information to track any modifications made to it, and whether it is scheduled for insertion or deletion when reconciled with the data source. The DataAdapter uses this information to reconcile changes and then calls AcceptChanges( ) on each DataRow to replace the original values with the current values. You can retrieve a DataSet with the same schema that contains only modified, deleted, or inserted rows using the GetChanges( ) method.

 public class  DataSet  : System.ComponentModel.MarshalByValueComponent ,  System.ComponentModel.IListSource, System.Xml.Serialization.IXmlSerializable,  System.ComponentModel.ISupportInitialize, System.Runtime.Serialization. ISerializable {  // Public Constructors  public  DataSet  (  );      public  DataSet  ( string   dataSetName   );  // Protected Constructors  protected  DataSet  (System.Runtime.Serialization.SerializationInfo   info   ,          System.Runtime.Serialization.StreamingContext   context   );  // Public Instance Properties  public bool  CaseSensitive  {set; get; }     public string  DataSetName  {set; get; }     public DataViewManager  DefaultViewManager  {get; }     public bool  EnforceConstraints  {set; get; }     public PropertyCollection  ExtendedProperties  {get; }     public bool  HasErrors  {get; }     public CultureInfo  Locale  {set; get; }     public string  Namespace  {set; get; }     public string  Prefix  {set; get; }     public DataRelationCollection  Relations  {get; }     public override ISite  Site  {set; get; }  // overrides System.ComponentModel.MarshalByValueComponent  public DataTableCollection  Tables  {get; }  // Public Instance Methods  public void  AcceptChanges  (  );      public void  BeginInit  (  );  // implements System.ComponentModel.ISupportInitialize  public void  Clear  (  );      public virtual DataSet  Clone  (  );      public DataSet  Copy  (  );      public void  EndInit  (  );  // implements System.ComponentModel.ISupportInitialize  public DataSet  GetChanges  (  );      public DataSet  GetChanges  ( DataRowState   rowStates   );      public string  GetXml  (  );      public string  GetXmlSchema  (  );      public bool  HasChanges  (  );      public bool  HasChanges  ( DataRowState   rowStates   );      public void  InferXmlSchema  (System.IO.Stream   stream   ,  string[ ]   nsArray   );    public void  InferXmlSchema  (string   fileName   , string[ ]   nsArray   );    public void  InferXmlSchema  (System.IO.TextReader   reader   ,  string[ ]   nsArray   );    public void  InferXmlSchema  (System.Xml.XmlReader   reader   ,  string[ ]   nsArray   );    public void  Merge  ( DataRow[ ]   rows   );      public void  Merge  (DataRow[ ]   rows   , bool   preserveChanges   , MissingSchemaAction   missingSchemaAction   );    public void  Merge  ( DataSet   dataSet   );      public void  Merge  ( DataSet   dataSet   , bool   preserveChanges   );      public void  Merge  (DataSet   dataSet   , bool   preserveChanges   , MissingSchemaAction   missingSchemaAction   );    public void  Merge  ( DataTable   table   );      public void  Merge  (DataTable   table   , bool   preserveChanges   , MissingSchemaAction   missingSchemaAction   );    public XmlReadMode  ReadXml  ( System.IO.Stream   stream   );      public XmlReadMode  ReadXml  (System.IO.Stream   stream   , XmlReadMode   mode   );    public XmlReadMode  ReadXml  ( string   fileName   );      public XmlReadMode  ReadXml  (string   fileName   , XmlReadMode   mode   );    public XmlReadMode  ReadXml  ( System.IO.TextReader   reader   );      public XmlReadMode  ReadXml  (System.IO.TextReader   reader   , XmlReadMode   mode   );    public XmlReadMode  ReadXml  ( System.Xml.XmlReader   reader   );      public XmlReadMode  ReadXml  (System.Xml.XmlReader   reader   , XmlReadMode   mode   );    public void  ReadXmlSchema  ( System.IO.Stream   stream   );      public void  ReadXmlSchema  ( string   fileName   );      public void  ReadXmlSchema  ( System.IO.TextReader   reader   );      public void  ReadXmlSchema  ( System.Xml.XmlReader   reader   );      public virtual void  RejectChanges  (  );      public virtual void  Reset  (  );      public void  WriteXml  ( System.IO.Stream   stream   );      public void  WriteXml  (System.IO.Stream   stream   , XmlWriteMode   mode   );    public void  WriteXml  ( string   fileName   );      public void  WriteXml  ( string   fileName   , XmlWriteMode   mode   );      public void  WriteXml  ( System.IO.TextWriter   writer   );      public void  WriteXml  (System.IO.TextWriter   writer   , XmlWriteMode   mode   );    public void  WriteXml  ( System.Xml.XmlWriter   writer   );  // implements System.Xml.Serialization.IXmlSerializable  public void  WriteXml  (System.Xml.XmlWriter   writer   , XmlWriteMode   mode   );    public void  WriteXmlSchema  ( System.IO.Stream   stream   );      public void  WriteXmlSchema  ( string   fileName   );      public void  WriteXmlSchema  ( System.IO.TextWriter   writer   );      public void  WriteXmlSchema  ( System.Xml.XmlWriter   writer   );  // Protected Instance Methods  protected virtual XmlSchema  GetSchemaSerializable  (  );      protected void  GetSerializationData  (System.Runtime.Serialization.SerializationInfo   info   ,         System.Runtime.Serialization.StreamingContext   context   );    protected internal virtual void  OnPropertyChanging  (System.ComponentModel.PropertyChangedEventArgs   pcevent   );    protected virtual void  OnRemoveRelation  (DataRelation   relation   );    protected virtual void  OnRemoveTable  ( DataTable   table   );      protected internal void  RaisePropertyChanging  (string   name   );    protected virtual void  ReadXmlSerializable  (System.Xml.XmlReader   reader   );    protected virtual bool  ShouldSerializeRelations  (  );      protected virtual bool  ShouldSerializeTables  (  );  // Events  public event MergeFailedEventHandler  MergeFailed  ;   } 

Hierarchy

System.Object figs/u2192.gif System.ComponentModel.MarshalByValueComponent(System.ComponentModel.IComponent, System.IDisposable , System.IServiceProvider) figs/u2192.gif DataSet(System.ComponentModel.IListSource, System.Xml.Serialization.IXmlSerializable , System.ComponentModel.ISupportInitialize , System.Runtime.Serialization.ISerializable)

Returned By

DataRelation.DataSet , DataRelationCollection.GetDataSet( ) , DataTable.DataSet , DataViewManager.DataSet , System.Xml.XmlDataDocument.DataSet

Passed To

Multiple types



ADO. NET in a Nutshell
ADO.NET in a Nutshell
ISBN: 0596003617
EAN: 2147483647
Year: 2005
Pages: 415

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