Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataSet / System / Data / DataTableExtensions.cs / 1 / DataTableExtensions.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Linq; using System.Xml; using System.Linq.Expressions; using System.Globalization; using System.Diagnostics; using System.Data.DataSetExtensions; namespace System.Data { ////// This static class defines the DataTable extension methods. /// public static class DataTableExtensions { ////// This method returns a IEnumerable of Datarows. /// /// /// The source DataTable to make enumerable. /// ////// IEnumerable of datarows. /// public static EnumerableRowCollectionAsEnumerable(this DataTable source) { DataSetUtil.CheckArgumentNull(source, "source"); return new EnumerableRowCollection (source); } /// /// This method takes an input sequence of DataRows and produces a DataTable object /// with copies of the source rows. /// Also note that this will cause the rest of the query to execute at this point in time /// (e.g. there is no more delayed execution after this sequence operator). /// /// /// The input sequence of DataRows /// ////// DataTable containing copies of the source DataRows. /// Properties for the DataTable table will be taken from first DataRow in the source. /// ///if source is null ///if source is empty public static DataTable CopyToDataTable(this IEnumerable source) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); return LoadTableFromEnumerable(source, null, null, null); } /// /// delegates to other CopyToDataTable overload with a null FillErrorEventHandler. /// public static void CopyToDataTable(this IEnumerable source, DataTable table, LoadOption options) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); DataSetUtil.CheckArgumentNull(table, "table"); LoadTableFromEnumerable(source, table, options, null); } /// /// This method takes an input sequence of DataRows and produces a DataTable object /// with copies of the source rows. /// Also note that this will cause the rest of the query to execute at this point in time /// (e.g. there is no more delayed execution after this sequence operator). /// /// /// The input sequence of DataRows /// /// CopyToDataTable uses DataRowVersion.Default when retrieving values from source DataRow /// which will include proposed values for DataRow being edited. /// /// Null DataRow in the sequence are skipped. /// /// /// The target DataTable to load. /// /// /// The target DataTable to load. /// /// /// Error handler for recoverable errors. /// Recoverable errors include: /// A source DataRow is in the deleted or detached state state. /// DataTable.LoadDataRow threw an exception, i.e. wrong # of columns in source row /// Unrecoverable errors include: /// exceptions from IEnumerator, DataTable.BeginLoadData or DataTable.EndLoadData /// ////// DataTable containing copies of the source DataRows. /// ///if source is null ///if table is null ///if source DataRow is in Deleted or Detached state public static void CopyToDataTable(this IEnumerable source, DataTable table, LoadOption options, FillErrorEventHandler errorHandler) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); DataSetUtil.CheckArgumentNull(table, "table"); LoadTableFromEnumerable(source, table, options, errorHandler); } private static DataTable LoadTableFromEnumerable (IEnumerable source, DataTable table, LoadOption? options, FillErrorEventHandler errorHandler) where T : DataRow { if (options.HasValue) { switch(options.Value) { case LoadOption.OverwriteChanges: case LoadOption.PreserveChanges: case LoadOption.Upsert: break; default: throw DataSetUtil.InvalidLoadOption(options.Value); } } using (IEnumerator rows = source.GetEnumerator()) { // need to get first row to create table if (!rows.MoveNext()) { if (table == null) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_EmptyDataRowSource); } else { return table; } } DataRow current; if (table == null) { current = rows.Current; if (current == null) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_NullDataRow); } table = new DataTable(); table.Locale = CultureInfo.CurrentCulture; // We do not copy the same properties that DataView.ToTable does. // If user needs that functionality, use other CopyToDataTable overloads. // The reasoning being, the IEnumerator can be sourced from // different DataTable, so we just use the "Default" instead of resolving the difference. foreach (DataColumn column in current.Table.Columns) { table.Columns.Add(column.ColumnName, column.DataType); } } table.BeginLoadData(); try { do { current = rows.Current; if (current == null) { continue; } object[] values = null; try { // 'recoverable' error block switch(current.RowState) { case DataRowState.Detached: if (!current.HasVersion(DataRowVersion.Proposed)) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_CannotLoadDetachedRow); } goto case DataRowState.Added; case DataRowState.Unchanged: case DataRowState.Added: case DataRowState.Modified: values = current.ItemArray; if (options.HasValue) { table.LoadDataRow(values, options.Value); } else { table.LoadDataRow(values, true); } break; case DataRowState.Deleted: throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_CannotLoadDeletedRow); default: throw DataSetUtil.InvalidDataRowState(current.RowState); } } catch (Exception e) { if (!DataSetUtil.IsCatchableExceptionType(e)) { throw; } FillErrorEventArgs fillError = null; if (null != errorHandler) { fillError = new FillErrorEventArgs(table, values); fillError.Errors = e; errorHandler.Invoke(rows, fillError); } if (null == fillError) { throw; } else if (!fillError.Continue) { if (Object.ReferenceEquals(fillError.Errors ?? e, e)) { // if user didn't change exception to throw (or set it to null) throw; } else { // user may have changed exception to throw in handler throw fillError.Errors; } } } } while (rows.MoveNext()); } finally { table.EndLoadData(); } } Debug.Assert(null != table, "null DataTable"); return table; } #region Methods to Create LinqDataView /// /// Creates a LinkDataView of DataRow over the input table. /// /// DataTable that the view is over. ///An instance of LinkDataView. public static DataView AsDataView(this DataTable table) { DataSetUtil.CheckArgumentNull(table, "table"); return new LinqDataView(table, null); } /// /// Creates a LinqDataView from EnumerableDataTable /// ///Type of the row in the table. Must inherit from DataRow /// The enumerable-datatable over which view must be created. ///Generated LinkDataView of type T public static DataView AsDataView(this EnumerableRowCollection source) where T : DataRow { DataSetUtil.CheckArgumentNull >(source, "source"); return source.GetLinqDataView(); } #endregion LinqDataView } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Linq; using System.Xml; using System.Linq.Expressions; using System.Globalization; using System.Diagnostics; using System.Data.DataSetExtensions; namespace System.Data { ////// This static class defines the DataTable extension methods. /// public static class DataTableExtensions { ////// This method returns a IEnumerable of Datarows. /// /// /// The source DataTable to make enumerable. /// ////// IEnumerable of datarows. /// public static EnumerableRowCollectionAsEnumerable(this DataTable source) { DataSetUtil.CheckArgumentNull(source, "source"); return new EnumerableRowCollection (source); } /// /// This method takes an input sequence of DataRows and produces a DataTable object /// with copies of the source rows. /// Also note that this will cause the rest of the query to execute at this point in time /// (e.g. there is no more delayed execution after this sequence operator). /// /// /// The input sequence of DataRows /// ////// DataTable containing copies of the source DataRows. /// Properties for the DataTable table will be taken from first DataRow in the source. /// ///if source is null ///if source is empty public static DataTable CopyToDataTable(this IEnumerable source) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); return LoadTableFromEnumerable(source, null, null, null); } /// /// delegates to other CopyToDataTable overload with a null FillErrorEventHandler. /// public static void CopyToDataTable(this IEnumerable source, DataTable table, LoadOption options) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); DataSetUtil.CheckArgumentNull(table, "table"); LoadTableFromEnumerable(source, table, options, null); } /// /// This method takes an input sequence of DataRows and produces a DataTable object /// with copies of the source rows. /// Also note that this will cause the rest of the query to execute at this point in time /// (e.g. there is no more delayed execution after this sequence operator). /// /// /// The input sequence of DataRows /// /// CopyToDataTable uses DataRowVersion.Default when retrieving values from source DataRow /// which will include proposed values for DataRow being edited. /// /// Null DataRow in the sequence are skipped. /// /// /// The target DataTable to load. /// /// /// The target DataTable to load. /// /// /// Error handler for recoverable errors. /// Recoverable errors include: /// A source DataRow is in the deleted or detached state state. /// DataTable.LoadDataRow threw an exception, i.e. wrong # of columns in source row /// Unrecoverable errors include: /// exceptions from IEnumerator, DataTable.BeginLoadData or DataTable.EndLoadData /// ////// DataTable containing copies of the source DataRows. /// ///if source is null ///if table is null ///if source DataRow is in Deleted or Detached state public static void CopyToDataTable(this IEnumerable source, DataTable table, LoadOption options, FillErrorEventHandler errorHandler) where T : DataRow { DataSetUtil.CheckArgumentNull(source, "source"); DataSetUtil.CheckArgumentNull(table, "table"); LoadTableFromEnumerable(source, table, options, errorHandler); } private static DataTable LoadTableFromEnumerable (IEnumerable source, DataTable table, LoadOption? options, FillErrorEventHandler errorHandler) where T : DataRow { if (options.HasValue) { switch(options.Value) { case LoadOption.OverwriteChanges: case LoadOption.PreserveChanges: case LoadOption.Upsert: break; default: throw DataSetUtil.InvalidLoadOption(options.Value); } } using (IEnumerator rows = source.GetEnumerator()) { // need to get first row to create table if (!rows.MoveNext()) { if (table == null) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_EmptyDataRowSource); } else { return table; } } DataRow current; if (table == null) { current = rows.Current; if (current == null) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_NullDataRow); } table = new DataTable(); table.Locale = CultureInfo.CurrentCulture; // We do not copy the same properties that DataView.ToTable does. // If user needs that functionality, use other CopyToDataTable overloads. // The reasoning being, the IEnumerator can be sourced from // different DataTable, so we just use the "Default" instead of resolving the difference. foreach (DataColumn column in current.Table.Columns) { table.Columns.Add(column.ColumnName, column.DataType); } } table.BeginLoadData(); try { do { current = rows.Current; if (current == null) { continue; } object[] values = null; try { // 'recoverable' error block switch(current.RowState) { case DataRowState.Detached: if (!current.HasVersion(DataRowVersion.Proposed)) { throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_CannotLoadDetachedRow); } goto case DataRowState.Added; case DataRowState.Unchanged: case DataRowState.Added: case DataRowState.Modified: values = current.ItemArray; if (options.HasValue) { table.LoadDataRow(values, options.Value); } else { table.LoadDataRow(values, true); } break; case DataRowState.Deleted: throw DataSetUtil.InvalidOperation(Strings.DataSetLinq_CannotLoadDeletedRow); default: throw DataSetUtil.InvalidDataRowState(current.RowState); } } catch (Exception e) { if (!DataSetUtil.IsCatchableExceptionType(e)) { throw; } FillErrorEventArgs fillError = null; if (null != errorHandler) { fillError = new FillErrorEventArgs(table, values); fillError.Errors = e; errorHandler.Invoke(rows, fillError); } if (null == fillError) { throw; } else if (!fillError.Continue) { if (Object.ReferenceEquals(fillError.Errors ?? e, e)) { // if user didn't change exception to throw (or set it to null) throw; } else { // user may have changed exception to throw in handler throw fillError.Errors; } } } } while (rows.MoveNext()); } finally { table.EndLoadData(); } } Debug.Assert(null != table, "null DataTable"); return table; } #region Methods to Create LinqDataView /// /// Creates a LinkDataView of DataRow over the input table. /// /// DataTable that the view is over. ///An instance of LinkDataView. public static DataView AsDataView(this DataTable table) { DataSetUtil.CheckArgumentNull(table, "table"); return new LinqDataView(table, null); } /// /// Creates a LinqDataView from EnumerableDataTable /// ///Type of the row in the table. Must inherit from DataRow /// The enumerable-datatable over which view must be created. ///Generated LinkDataView of type T public static DataView AsDataView(this EnumerableRowCollection source) where T : DataRow { DataSetUtil.CheckArgumentNull >(source, "source"); return source.GetLinqDataView(); } #endregion LinqDataView } } // 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
- BaseValidatorDesigner.cs
- ContainsRowNumberChecker.cs
- RequestQueue.cs
- InternalConfigHost.cs
- MissingMemberException.cs
- IPEndPointCollection.cs
- XmlQuerySequence.cs
- AttachmentService.cs
- PriorityBinding.cs
- ChangeNode.cs
- WebServiceParameterData.cs
- LocatorGroup.cs
- Literal.cs
- DocumentXmlWriter.cs
- StandardTransformFactory.cs
- NonBatchDirectoryCompiler.cs
- FileDialog_Vista_Interop.cs
- ModelTreeEnumerator.cs
- NonNullItemCollection.cs
- NamespaceQuery.cs
- PageSetupDialog.cs
- Package.cs
- RotationValidation.cs
- ListViewGroup.cs
- RadioButtonFlatAdapter.cs
- UniqueID.cs
- ZipIOExtraField.cs
- ValidationErrorCollection.cs
- Image.cs
- EventKeyword.cs
- NavigationProgressEventArgs.cs
- HiddenField.cs
- CroppedBitmap.cs
- HopperCache.cs
- BufferedResponseStream.cs
- Int64AnimationBase.cs
- QuaternionAnimation.cs
- LostFocusEventManager.cs
- DynamicRendererThreadManager.cs
- ImageInfo.cs
- XmlSchemaSimpleContentExtension.cs
- HyperLinkField.cs
- Popup.cs
- DrawingContextDrawingContextWalker.cs
- XmlTextReader.cs
- InputMethod.cs
- NameNode.cs
- DrawingCollection.cs
- WebPartCatalogAddVerb.cs
- versioninfo.cs
- Condition.cs
- SqlUserDefinedAggregateAttribute.cs
- ConstantSlot.cs
- ExtendedTransformFactory.cs
- SqlServer2KCompatibilityCheck.cs
- WindowsListViewItemStartMenu.cs
- Selection.cs
- SelectionRangeConverter.cs
- CompilerWrapper.cs
- MessageEventSubscriptionService.cs
- CounterSample.cs
- BamlLocalizationDictionary.cs
- PackageStore.cs
- ConnectionStringEditor.cs
- SettingsBase.cs
- DuplexChannelBinder.cs
- selecteditemcollection.cs
- TrackingRecord.cs
- newinstructionaction.cs
- PermissionSetTriple.cs
- CheckBoxField.cs
- Grammar.cs
- UTF8Encoding.cs
- ApplicationManager.cs
- RoleGroupCollection.cs
- SurrogateEncoder.cs
- DataServiceQuery.cs
- MulticastIPAddressInformationCollection.cs
- ObjectDataSourceMethodEventArgs.cs
- XmlElementAttributes.cs
- SettingsPropertyWrongTypeException.cs
- WindowCollection.cs
- SearchForVirtualItemEventArgs.cs
- DropShadowBitmapEffect.cs
- NativeMethods.cs
- DataRecord.cs
- _UriSyntax.cs
- QilGenerator.cs
- ContextMarshalException.cs
- CharacterMetricsDictionary.cs
- AuthenticationService.cs
- HttpRawResponse.cs
- MeasureData.cs
- XmlNotation.cs
- ListViewGroupConverter.cs
- _UriTypeConverter.cs
- Switch.cs
- NameTable.cs
- BitStack.cs
- TemplatedControlDesigner.cs