Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataSet / System / Data / DataTableExtensions.cs / 1305376 / 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.
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