Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / AccessDataSource.cs / 1305376 / AccessDataSource.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Data.OleDb; using System.Diagnostics; using System.Drawing; using System.Drawing.Design; using System.IO; using System.Text; using System.Web.Caching; using System.Web.UI; ////// Allows a user to create a declarative connection to an Access database in a .aspx page. /// [ Designer("System.Web.UI.Design.WebControls.AccessDataSourceDesigner, " + AssemblyRef.SystemDesign), ToolboxBitmap(typeof(AccessDataSource)), WebSysDescription(SR.AccessDataSource_Description), WebSysDisplayName(SR.AccessDataSource_DisplayName) ] public class AccessDataSource : SqlDataSource { private const string OleDbProviderName = "System.Data.OleDb"; private const string JetProvider = "Microsoft.Jet.OLEDB.4.0"; private const string Access2007Provider = "Microsoft.ACE.OLEDB.12.0"; private const string Access2007FileExtension = ".accdb"; private FileDataSourceCache _cache; private string _connectionString; private string _dataFile; private string _physicalDataFile; ////// Creates a new instance of AccessDataSource. /// public AccessDataSource() : base() { } ////// Creates a new instance of AccessDataSource with a specified connection string and select command. /// public AccessDataSource(string dataFile, string selectCommand) : base() { if (String.IsNullOrEmpty(dataFile)) { throw new ArgumentNullException("dataFile"); } DataFile = dataFile; SelectCommand = selectCommand; } ////// Specifies the cache settings for this data source. For the cache to /// work, the DataSourceMode must be set to DataSet. /// internal override DataSourceCache Cache { get { if (_cache == null) { _cache = new FileDataSourceCache(); } return _cache; } } ////// Gets the connection string for the AccessDataSource. This property is auto-generated and cannot be set. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string ConnectionString { get { if (_connectionString == null) { _connectionString = CreateConnectionString(); } return _connectionString; } set { throw new InvalidOperationException(SR.GetString(SR.AccessDataSource_CannotSetConnectionString)); } } ////// The name of an Access database file. /// This property is not stored in ViewState. /// [ DefaultValue(""), Editor("System.Web.UI.Design.MdbDataFileEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebCategory("Data"), WebSysDescription(SR.AccessDataSource_DataFile), ] public string DataFile { get { return (_dataFile == null) ? String.Empty : _dataFile; } set { if (DataFile != value) { _dataFile = value; _connectionString = null; _physicalDataFile = null; RaiseDataSourceChangedEvent(EventArgs.Empty); } } } ////// Gets the file data source cache object. /// private FileDataSourceCache FileDataSourceCache { get { FileDataSourceCache fileCache = Cache as FileDataSourceCache; Debug.Assert(fileCache != null, "Cache object should be a FileDataSourceCache"); return fileCache; } } ////// Gets the Physical path of the data file. /// private string PhysicalDataFile { get { if (_physicalDataFile == null) { _physicalDataFile = GetPhysicalDataFilePath(); } return _physicalDataFile; } } internal string NativeProvider { get { if (IsAccess2007) { return Access2007Provider; } return JetProvider; } } internal virtual bool IsAccess2007 { get { // Access 2007 changed the file format so we have to pick the right provider based on extension. return Path.GetExtension(PhysicalDataFile) == Access2007FileExtension; } } ////// Gets/sets the ADO.net managed provider name. This property is restricted to the OLE DB provider and cannot be set. /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string ProviderName { get { return OleDbProviderName; } set { throw new InvalidOperationException(SR.GetString(SR.AccessDataSource_CannotSetProvider, ID)); } } ////// A semi-colon delimited string indicating which databases to use for the dependency in the format "database1:table1;database2:table2". /// [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override string SqlCacheDependency { get { throw new NotSupportedException(SR.GetString(SR.AccessDataSource_SqlCacheDependencyNotSupported, ID)); } set { throw new NotSupportedException(SR.GetString(SR.AccessDataSource_SqlCacheDependencyNotSupported, ID)); } } private void AddCacheFileDependency() { FileDataSourceCache.FileDependencies.Clear(); string filename = PhysicalDataFile; if (filename.Length > 0) { FileDataSourceCache.FileDependencies.Add(filename); } } ////// Creates a connection string for an Access database connection. /// The JET or ACE provider is used based on the DataFile extension, and the filename, username, password, and /// share mode are are set. /// private string CreateConnectionString() { return "Provider=" + NativeProvider + "; Data Source=" + PhysicalDataFile; } ////// Creates a new AccessDataSourceView. /// protected override SqlDataSourceView CreateDataSourceView(string viewName) { return new AccessDataSourceView(this, viewName, Context); } protected override DbProviderFactory GetDbProviderFactory() { return OleDbFactory.Instance; } ////// Gets the appropriate mapped path for the DataFile. /// private string GetPhysicalDataFilePath() { string filename = DataFile; if (filename.Length == 0) { return null; } if (!System.Web.Util.UrlPath.IsAbsolutePhysicalPath(filename)) { // Root relative path if (DesignMode) { // This exception should never be thrown - the designer always maps paths // before using the runtime control. throw new NotSupportedException(SR.GetString(SR.AccessDataSource_DesignTimeRelativePathsNotSupported, ID)); } filename = Context.Request.MapPath(filename, AppRelativeTemplateSourceDirectory, true); } HttpRuntime.CheckFilePermission(filename, true); // We also need to check for path discovery permissions for the // file since the page developer will be able to see the physical // path in the ConnectionString property. if (!HttpRuntime.HasPathDiscoveryPermission(filename)) { throw new HttpException(SR.GetString(SR.AccessDataSource_NoPathDiscoveryPermission, HttpRuntime.GetSafePath(filename), ID)); } return filename; } ////// Saves data to the cache. /// internal override void SaveDataToCache(int startRowIndex, int maximumRows, object data, CacheDependency dependency) { AddCacheFileDependency(); base.SaveDataToCache(startRowIndex, maximumRows, data, dependency); } /*internal override void SaveTotalRowCountToCache(int totalRowCount) { AddCacheFileDependency(); base.SaveTotalRowCountToCache(totalRowCount); }*/ } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- IDQuery.cs
- CorrelationTokenInvalidatedHandler.cs
- Int32KeyFrameCollection.cs
- IDictionary.cs
- UInt64.cs
- AlignmentXValidation.cs
- MessageSecurityOverHttpElement.cs
- ClrProviderManifest.cs
- FormView.cs
- CharStorage.cs
- EncoderExceptionFallback.cs
- IpcChannel.cs
- DataSourceView.cs
- AsymmetricSignatureDeformatter.cs
- DeferredReference.cs
- ModuleBuilder.cs
- Pen.cs
- DataRowView.cs
- hresults.cs
- ResumeStoryboard.cs
- TextSelectionHighlightLayer.cs
- CorePropertiesFilter.cs
- QueryAccessibilityHelpEvent.cs
- HttpPostedFile.cs
- UnsafeNativeMethods.cs
- MonthChangedEventArgs.cs
- StylusDevice.cs
- StyleTypedPropertyAttribute.cs
- TemplateBindingExpressionConverter.cs
- ActiveXHelper.cs
- GroupBoxRenderer.cs
- FastEncoder.cs
- NameSpaceExtractor.cs
- XhtmlConformanceSection.cs
- DynamicPropertyReader.cs
- oledbconnectionstring.cs
- WebEvents.cs
- GridViewRow.cs
- ActivitySurrogateSelector.cs
- CqlWriter.cs
- SmiContext.cs
- ProfileService.cs
- XmlSchemaSimpleContent.cs
- UnitySerializationHolder.cs
- SoapServerProtocol.cs
- StandardRuntimeEnumValidator.cs
- CompileLiteralTextParser.cs
- EdmItemCollection.cs
- NetDataContractSerializer.cs
- ProfessionalColors.cs
- WorkflowServiceHost.cs
- ModuleBuilderData.cs
- SystemPens.cs
- XmlSchemaInclude.cs
- MemberExpression.cs
- PrintSchema.cs
- CustomError.cs
- NativeMethods.cs
- GetPageCompletedEventArgs.cs
- BamlRecordWriter.cs
- EditorAttribute.cs
- BaseServiceProvider.cs
- TypeValidationEventArgs.cs
- NamespaceList.cs
- Compiler.cs
- GetPageCompletedEventArgs.cs
- BulletChrome.cs
- StylusButtonEventArgs.cs
- ZoneMembershipCondition.cs
- LicenseException.cs
- DescendantBaseQuery.cs
- FileIOPermission.cs
- GeneralTransform.cs
- RoleGroupCollection.cs
- SynchronizationValidator.cs
- WebPartConnectionCollection.cs
- ManipulationDelta.cs
- AuthorizationSection.cs
- PartialTrustVisibleAssembly.cs
- StringReader.cs
- SqlServer2KCompatibilityCheck.cs
- _ConnectStream.cs
- DataGridItemEventArgs.cs
- SizeAnimation.cs
- SchemaInfo.cs
- HtmlElementErrorEventArgs.cs
- X509InitiatorCertificateServiceElement.cs
- PinnedBufferMemoryStream.cs
- HotSpotCollectionEditor.cs
- LabelLiteral.cs
- KeyboardDevice.cs
- ComPlusTraceRecord.cs
- StatusInfoItem.cs
- ExpressionTextBoxAutomationPeer.cs
- SqlRetyper.cs
- WebPartTransformerAttribute.cs
- Iis7Helper.cs
- PolicyException.cs
- HideDisabledControlAdapter.cs
- SortedDictionary.cs