Business Logic Toolkit for .NET
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Download one of the following zip-files. Unzip it. Add either BLToolkit.2.csproj (FW 2.0: VS 2005, VS 2008), or BLToolkit.3.csproj (FW 3.5: VS 2008), or BLToolkit.4.csproj (FW 4.0: VS 2010) project into your solution. Add project references where you need it. Compile. Enjoy.

Archives on GitHub.
 
Current repository snapshot (v.4.1)
bltoolkit.zipSource code
bltoolkit_dev.zipFull dev version
bltoolkit_bin.zipBinaries
 
Previous version 4.0
BLToolkit 4.0Source code
BLToolkit 4.0 DevFull dev version
BLToolkit 4.0 BinBinaries
 
Origin GitHub repository.
 
Also available on NuGet (search for packages with prefix bltoolkit)

Change Log:

v 4.1

Enhancement

- New Linq converter.
- New InsertOrUpdate method.


v 4.0

Enhancement

- No more .NET Framework 2.0 support.
- T4 Templates for Sybase, MS SQL Server, MySql, and PostgreSQL.
- Linq over WCF.
- Silverlight support.
- New attributes TableFunction & TableExpression to support table-valued UDF, hints,
  and other around table decorations.
- Linq DML support.


v 3.2

Demo (see the dev version of the project)

- Linq.Demo.
- WebServices powered by BLToolkit.
- Partial.Trust demo.

Bug fixes

- Extension assemblies are ignored in TypeFactory.GetType(type).
- Default parameter values were ignored by OverloadAspectBuilder.
- [Parameter(null)] wasn't setting Nullable<> and EditableValue<Nullable<>> values to null
- DefaultTypeBuilder throwing exception if [Parameter(value)] was used on
  EditableValue<Nullable<>> generated properties when Nullable<> did have appropriate
  constructor accepting value type
- DateTimeOffset wasn't handled in DataReaderMapper correctly.

Enhancement

- Linq provider for supported databases.
- New Object to Object mapping. See ExpressionMapper.
- PostgreSQL Data Provider added.
- Informix Data Provider added.
- DB2 Data Provider added.
- New SqlIgnore attribute.
- New SqlBuilder class.
- Partial trust support.
- Mapping to/from private classes (FW 3.x only).
- New ParamTypeName attribute for SqlServer2008 table-type parameter support (FW 3.x only).
- EditableArrayList & BindingListImpl implements INotifyCollectionChanged interface.


v 3.1

Bug fixes

- MapValueAttribute ignored for nullable enums.
- MappingSchema.ConvertChangeType does not handle nullable enums properly.
- EditableArrayList indexer add/remove bug.
- ParameterAttribute doesn't work with Nullabe<T> and EditableValue<T>
  when 'T' constructor is not trivial.
- BindingListImpl.AddNew does not fire ListChanged event.
- Some inner types are missing in ObjectMappes, some included w/o reason.
- Setter for ObjectBinder.ItemType fires OnListChanged event before the list changes.
- Convert<To,From> does not handle `Nullable<To>' from scalar `From' case.
- EditableXmlDocument fires PropertyChanged event before an xml node changes.

Enhancement

- CHM help file provided. See the Doc folder.
- New InstanceCache attribute.
- DataAccessor support for IEnumerable<T>.
- Multiple duck. See DuckTyping.Aggregate methods.
- New Overload aspect.
- Own configuration section.
- TypeFactory.GetType() is public now.
- Simplified GenerateAttributeAttribute usage.


v 3.0

Breaking changes

- No more support for .Net 1.1 Framework.

Bug fixes

- EmitHelper.ldc_i4_ emits wrong opcode for numbers from 128 till 255 (bug in msdn)
- Some opcodes were not implemented.
- MappingSchema.MapResultSets fails with NullReferenceException when no data returned.
- Nullable enums were not handled properly.
- BindingList.GetItemSortedPosition() returns wrong index for an item at end of the list.
- Fixed AsyncAspect and other type builders compatibility.
- DbMananger.DiscoverSpParameters fires both OpenConnection and CloseConnection events.

Enhancement

- DateTimeOffset type support.
- MemberAccessor.CloneValue to avoid boxing.
- Named arguments support for GenerateAttributeTypeBuilder.
- Extended support for IsNull & Nullable types in MemberAccessor.
- Support for enum values in EmitHelper.LoadWellKnownValue/LoadInitValue and so on.
- Generic GetValue/SetValue methods for ValueHolders.
- Different projects to support FW 2.0 & FW 3.5.
- LinqMetadataProvider to support Linq To SQL attributes.
- Relocated MetadataProvider's to BLToolkit.Reflection namespace.
- New DbManager ctors to support manual/custom configuration.
- Ability to configure SqlQueryAttribute dynamically.
- Assembly is signed.
- New ActualTypeAttribute to associate DataAccessor's object type and its implementation.
- New AutoImplementInterfaceAttribute to automatically generate interface implementation.
- New TypeAccessor.AssociateType method and TypeAccessor.AssociatedTypeHandler event
  to control interface/type implementation.
- DataException now has the 'Number' property.
- New ClearCache aspect.


v 2.0.7

Bug fixes

- Oracle/Odp does not handle colon (':') in ConvertType.ParameterToName.
- Property change builder will use op_Inequality operation if it is available to compare
  property values.
- DbManager.ExecuteList<T>(params object[]) add an extra typeof(T)
- EditableObject.Clone does reference cloning of its inner objects.
- EditableObject.Clone does not track dirty state of its members.
- Generated assembly name ends with '.dll'.
  As a result, System.Reflection.Assembly.Load() tries to load 'SomeAssembly.dll.DLL'
  and fails.
- Oracle treat '\r' as an invalid character.
- DataAccessorBuilder calls DbProvider.Convert(NameToParameter) for text query
  parameters.
- SqlQueryBase.GetKeyFieldList was incorrectly marked as public.
- TypeAccessorBuilder fails to build a getter/setter if base method is protected.
- EditableXmlDocument fails to reject changes if there was an attribute insertion or
  deletion.

Enhancement

- FdpDataProvider.QuoteIdentifiers option for FB data provier.
- GenerateAtribute attribute to specify any custom attribute for a generated type or
  member.
- SQLite data provider.
- DeriveParameters implemented for MsAccess data provider.
- XmlIncludeAbstractAttribute to simplify the xml serialization of a BLToolkit generated
  type.
- Better support for internal types/members. The behavior is configurable via
  Configuration.EditableObjectUsesMemberwiseEquals property.
- VS 2008 support.


v 2.0.6

Demo

- MS PetShop 4.0 powered by BLToolkit (see the dev version of the project).

Bug fixes

- DbManager.OutputParameter lacks overload with 'size' parameters.
- CacheAspect hungs a desktop application on exit.
- ExecuteResultSet fails on many-to-one relations.
- TypeBuilder fails to override a method with generic parameters or generic return type.

Enhancement

- ParamSize & ParamDbType attributes to tweak DataAccessor parameters. Especially output
  ones.
- All 'emit.stloc' immediately followed by 'emit.ldloc' were replaced with simple
  'emit.dup' command.
  Lots of redundant local variables were removed.
- UnitTests for Oracle, Firebird & Access (Jet)
- DataSetTableAttribute is handled by all DataSet/DataTable related methods of
  DataAccessBuilder.
- ClearCache method for CacheAspect.
- Metadata provider for mapping.
- Ability to specify global assembly version & strong name key pair.
- AsyncAspect to execute any method asynchronously.
- Added support for ConnectionStrings config settings.
- Editable XmlDocuments.
- Added support for IDictionary, IDictionary<,>, IList, and IList<> abstract data
  accessor return types.


v 2.0.5

Breaking changes

- DbManager.InitCommand renamed to OnInitCommand.

Bug fixes

- System.Reflection.Emit.AssemblyBuilder assemblies are processed properly.
- RegExAttribute - now properly returns valid==true only when whole value is equal to
  match.
- EditableObject serialization issue
- StandardPropertyDescriptor.CheckNull was always returning DBNull.Value if _isNull
  handler was returning null. Now configurable via Configuration.CheckNullReturnIfNull.
- PropertyChangedBuilder was crashing when property was not public
- ObjectBinder.IsNull was serialized to resources
- Oracle provider now handles arrays of nullable types correctly.
- DataAccessor.PrepareParameters was invoked only to ref parameters.
- DataAccessor.PrepareParameters lacks DbManager which may be external.
- DbManager.InitParameters did hot handle decimal type.
- MappingSchema.ValueToEnum fails with underlying type other then Int32. 
- CounterAspect catches the OnCatch event now to count exceptions.
- DbManager.ExecuteForEach does not call InitParameters in the loop.

Enhancement

- Ability to specify RegexOptions for RegExAttribute. Regex not being created on every
  call to IsValid
- Destination attribute works with scalar types.
- DataAccessorBuilder generates getters/setters for abstract properties & indexers.
- Ability to specify globaly whether strings should be trimed when mapping
- Ability to specify whether PropertyChange notification should only be fired when
  underlying value is changed and not when setter is called
- XmlDocument type support.
- DbManager.SetParameters() accepts arrays of IDbDataParameter.
- DataSetTableAttribute for DataAccessorBuilder to explicitly specify DataSet table name.
- Default CacheAspect.IsWeak value changed to false.
- Cleanup thread for CacheAspect.
- MemberMapper type can be specified directly in the target type declaration.
- Events for DbManager.OnBeforeOperation, OnAfterOperation, OnOperationException &
  OnInitCommand.


v 2.0.4

Bug fixes

- By default, the mapper included const fields into map list (???).
- If enum does not have explicit mapping, data accessor builder 
  does not convert it to underlying type.
- MemberMapper fails to convert an object to its base type.
- BindingListImpl.RemoveSort was not firing ListChange event.
- TypeAccessor.CreateExtendedPropertyDescriptors did not work properly
  with 3rd+ level nested properties.
- Object holder ignored NoInstanceAttribute.
- ValidatorContext caches NullValue.
- EditableObject.RejectChanges/RejectMemberChanges were not firing PropertyChanged event
  for reverted fields.
- Fixed the generating IsValueType && !IsPrimitive ref/out parameters.

Enhancement

- Operator<T> is extensible now.
- ObjectBinder can now control lifetime (Disposal) of underlying collection.
- DuckTyping.
- ParamNullValue attribute.
- Virtual method DataProviderBase.PrepareCommand to let a data provider modify SQL
  statement befory query.
- Virtual method CacheAspect.GetCache. Can be used to provide a custom hashtable.


v 2.0.3

Bug fixes

- Race condition in MappingSchema.GetObjectMapper.
- DbManager will not try to close the connection in the finalizer anymore.
- MinValue/MaxValue attributes now determine value type by object property/field instead
  of test value.
- Fixed obscure case when object is removed from EditableArrayList/BindingListImpl while
  ItemPropertyChanged delegate is in process of being executed and collection handler was
  not yet invoked.

Enhancement

- HttpReader SOAP support.
- Convert<T,P> uses type cast operators when available.
- Third party DataProvider registration via appsettings.
- More specification adherent sorting behavior implementation of 
  IBindingList/IBindingListView in BindingListImpl. 
- EditableArrayList (potentially breaking changes) heavily relies on BindingListImpl for
  IBindingList/IBindingListView and their base interfaces implementation. 
- BindingListImpl is changed to be fully specification adherent binding wrapper for other
  object lists/collection types.
- 2.0.1 version obsolete methods have been removed.


v 2.0.2

Bug fixes

- Abstract class builder overrode virtual final methods.
- Append records to a log file.
- ObjectBinder's AllowNew, AllowEdit, AllowRemove properties serialization.

Enhancement

- New DataAccessor<T,A> class.
- Direction.ReturnValueAttribute takes the Member parameter in '@fieldName' format.
- New property Object of the InterceptCallInfo class, which is an intercepted object
  reference.
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