Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DLinq / Dlinq / SqlClient / SqlConnectionManager.cs / 1 / SqlConnectionManager.cs
using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Linq.Expressions; using System.IO; using System.Reflection; using System.Text; using System.Transactions; namespace System.Data.Linq.SqlClient { using System.Data.Linq; using System.Data.Linq.Provider; internal class SqlConnectionManager : IConnectionManager { private IProvider provider; private DbConnection connection; private bool autoClose; private DbTransaction transaction; private Transaction systemTransaction; private SqlInfoMessageEventHandler infoMessagehandler; private Listusers; private int maxUsers; internal SqlConnectionManager(IProvider provider, DbConnection con, int maxUsers) { this.provider = provider; this.connection = con; this.maxUsers = maxUsers; this.infoMessagehandler = new SqlInfoMessageEventHandler(this.OnInfoMessage); this.users = new List (maxUsers); } public DbConnection UseConnection(IConnectionUser user) { if (user == null) { throw Error.ArgumentNull("user"); } if (this.connection.State == ConnectionState.Closed) { this.connection.Open(); this.autoClose = true; this.AddInfoMessageHandler(); if (System.Transactions.Transaction.Current != null) { System.Transactions.Transaction.Current.TransactionCompleted += this.OnTransactionCompleted; } } if (this.transaction == null && System.Transactions.Transaction.Current != null && System.Transactions.Transaction.Current != systemTransaction) { this.ClearConnection(); systemTransaction = System.Transactions.Transaction.Current; this.connection.EnlistTransaction(System.Transactions.Transaction.Current); } if (this.users.Count == this.maxUsers) { this.BootUser(this.users[0]); } this.users.Add(user); return this.connection; } private void BootUser(IConnectionUser user) { bool saveAutoClose = this.autoClose; this.autoClose = false; int index = this.users.IndexOf(user); if (index >= 0) { this.users.RemoveAt(index); } user.CompleteUse(); this.autoClose = saveAutoClose; } internal DbConnection Connection { get { return this.connection; } } internal int MaxUsers { get { return this.maxUsers; } } internal void DisposeConnection() { // only close this guy if we opened it in the first place if (this.autoClose) { this.CloseConnection(); } } internal void ClearConnection() { while (this.users.Count > 0) { this.BootUser(this.users[0]); } } internal bool AutoClose { get { return this.autoClose; } set { this.autoClose = value; } } internal DbTransaction Transaction { get { return this.transaction; } set { if (value != this.transaction) { if (value != null) { if (this.connection != value.Connection) { throw Error.TransactionDoesNotMatchConnection(); } } this.transaction = value; } } } public void ReleaseConnection(IConnectionUser user) { if (user == null) { throw Error.ArgumentNull("user"); } int index = this.users.IndexOf(user); if (index >= 0) { this.users.RemoveAt(index); } if (this.users.Count == 0 && this.autoClose && this.transaction == null && System.Transactions.Transaction.Current == null) { this.CloseConnection(); } } private void CloseConnection() { if (this.connection != null && this.connection.State != ConnectionState.Closed) { this.connection.Close(); } this.RemoveInfoMessageHandler(); this.autoClose = false; } private void OnInfoMessage(object sender, SqlInfoMessageEventArgs args) { if (this.provider.Log != null) { this.provider.Log.WriteLine(Strings.LogGeneralInfoMessage(args.Source, args.Message)); } } private void OnTransactionCompleted(object sender, System.Transactions.TransactionEventArgs args) { if (this.users.Count == 0 && this.autoClose) { this.CloseConnection(); } } private void AddInfoMessageHandler() { SqlConnection scon = this.connection as SqlConnection; if (scon != null) { scon.InfoMessage += this.infoMessagehandler; } } private void RemoveInfoMessageHandler() { SqlConnection scon = this.connection as SqlConnection; if (scon != null) { scon.InfoMessage -= this.infoMessagehandler; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Linq.Expressions; using System.IO; using System.Reflection; using System.Text; using System.Transactions; namespace System.Data.Linq.SqlClient { using System.Data.Linq; using System.Data.Linq.Provider; internal class SqlConnectionManager : IConnectionManager { private IProvider provider; private DbConnection connection; private bool autoClose; private DbTransaction transaction; private Transaction systemTransaction; private SqlInfoMessageEventHandler infoMessagehandler; private List users; private int maxUsers; internal SqlConnectionManager(IProvider provider, DbConnection con, int maxUsers) { this.provider = provider; this.connection = con; this.maxUsers = maxUsers; this.infoMessagehandler = new SqlInfoMessageEventHandler(this.OnInfoMessage); this.users = new List (maxUsers); } public DbConnection UseConnection(IConnectionUser user) { if (user == null) { throw Error.ArgumentNull("user"); } if (this.connection.State == ConnectionState.Closed) { this.connection.Open(); this.autoClose = true; this.AddInfoMessageHandler(); if (System.Transactions.Transaction.Current != null) { System.Transactions.Transaction.Current.TransactionCompleted += this.OnTransactionCompleted; } } if (this.transaction == null && System.Transactions.Transaction.Current != null && System.Transactions.Transaction.Current != systemTransaction) { this.ClearConnection(); systemTransaction = System.Transactions.Transaction.Current; this.connection.EnlistTransaction(System.Transactions.Transaction.Current); } if (this.users.Count == this.maxUsers) { this.BootUser(this.users[0]); } this.users.Add(user); return this.connection; } private void BootUser(IConnectionUser user) { bool saveAutoClose = this.autoClose; this.autoClose = false; int index = this.users.IndexOf(user); if (index >= 0) { this.users.RemoveAt(index); } user.CompleteUse(); this.autoClose = saveAutoClose; } internal DbConnection Connection { get { return this.connection; } } internal int MaxUsers { get { return this.maxUsers; } } internal void DisposeConnection() { // only close this guy if we opened it in the first place if (this.autoClose) { this.CloseConnection(); } } internal void ClearConnection() { while (this.users.Count > 0) { this.BootUser(this.users[0]); } } internal bool AutoClose { get { return this.autoClose; } set { this.autoClose = value; } } internal DbTransaction Transaction { get { return this.transaction; } set { if (value != this.transaction) { if (value != null) { if (this.connection != value.Connection) { throw Error.TransactionDoesNotMatchConnection(); } } this.transaction = value; } } } public void ReleaseConnection(IConnectionUser user) { if (user == null) { throw Error.ArgumentNull("user"); } int index = this.users.IndexOf(user); if (index >= 0) { this.users.RemoveAt(index); } if (this.users.Count == 0 && this.autoClose && this.transaction == null && System.Transactions.Transaction.Current == null) { this.CloseConnection(); } } private void CloseConnection() { if (this.connection != null && this.connection.State != ConnectionState.Closed) { this.connection.Close(); } this.RemoveInfoMessageHandler(); this.autoClose = false; } private void OnInfoMessage(object sender, SqlInfoMessageEventArgs args) { if (this.provider.Log != null) { this.provider.Log.WriteLine(Strings.LogGeneralInfoMessage(args.Source, args.Message)); } } private void OnTransactionCompleted(object sender, System.Transactions.TransactionEventArgs args) { if (this.users.Count == 0 && this.autoClose) { this.CloseConnection(); } } private void AddInfoMessageHandler() { SqlConnection scon = this.connection as SqlConnection; if (scon != null) { scon.InfoMessage += this.infoMessagehandler; } } private void RemoveInfoMessageHandler() { SqlConnection scon = this.connection as SqlConnection; if (scon != null) { scon.InfoMessage -= this.infoMessagehandler; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SrgsDocumentParser.cs
- WebBrowser.cs
- XmlSchemaGroup.cs
- MenuRendererClassic.cs
- PackageRelationshipSelector.cs
- XNameConverter.cs
- ContentPlaceHolderDesigner.cs
- ComContractElementCollection.cs
- ConditionedDesigner.cs
- GridView.cs
- WhitespaceSignificantCollectionAttribute.cs
- FloaterBaseParagraph.cs
- DataTableCollection.cs
- SqlReorderer.cs
- DataGridViewCellValueEventArgs.cs
- NamedObjectList.cs
- StdValidatorsAndConverters.cs
- AutomationPattern.cs
- SingleStorage.cs
- ReferencedType.cs
- UriTemplateVariableQueryValue.cs
- ReadOnlyHierarchicalDataSourceView.cs
- RoleBoolean.cs
- Constants.cs
- SetterBase.cs
- HttpListenerRequest.cs
- FakeModelItemImpl.cs
- SqlResolver.cs
- Constants.cs
- DatatypeImplementation.cs
- ReceiveErrorHandling.cs
- WebPermission.cs
- BindingContext.cs
- ConfigXmlText.cs
- SqlConnection.cs
- InputScopeConverter.cs
- WSHttpBinding.cs
- PropertyEmitter.cs
- HandledEventArgs.cs
- RuleRefElement.cs
- WindowsAuthenticationModule.cs
- RequestCachePolicy.cs
- ComboBoxRenderer.cs
- SQLDouble.cs
- WebPartAuthorizationEventArgs.cs
- SocketException.cs
- SystemColors.cs
- GAC.cs
- ReceiveActivity.cs
- GlyphManager.cs
- AdPostCacheSubstitution.cs
- Function.cs
- ClientScriptItem.cs
- TlsnegoTokenAuthenticator.cs
- PropertyGeneratedEventArgs.cs
- PackagePartCollection.cs
- ReservationCollection.cs
- ApplicationFileParser.cs
- TemplateEditingService.cs
- ElementHost.cs
- WebMessageBodyStyleHelper.cs
- DataFormat.cs
- XmlEventCache.cs
- SizeF.cs
- FormatVersion.cs
- DesignerObject.cs
- IndependentAnimationStorage.cs
- MimeParameterWriter.cs
- PerfCounters.cs
- CardSpaceException.cs
- DrawingVisualDrawingContext.cs
- GlyphRun.cs
- XmlSchemas.cs
- DbConnectionPoolOptions.cs
- ProvidersHelper.cs
- ArrayListCollectionBase.cs
- NamedPipeAppDomainProtocolHandler.cs
- SamlAuthenticationClaimResource.cs
- RowCache.cs
- CacheDict.cs
- SelectQueryOperator.cs
- HttpEncoderUtility.cs
- Instrumentation.cs
- AssemblyBuilderData.cs
- FullTextLine.cs
- UpdatePanel.cs
- BackStopAuthenticationModule.cs
- AvtEvent.cs
- GroupByQueryOperator.cs
- PopupEventArgs.cs
- BuildResult.cs
- ToolboxComponentsCreatingEventArgs.cs
- XmlReaderSettings.cs
- WebServiceEnumData.cs
- ReachSerializerAsync.cs
- AssemblyHash.cs
- PreservationFileReader.cs
- ArgIterator.cs
- Win32NamedPipes.cs
- WebCategoryAttribute.cs