/
DataView.cs
1779 lines (1564 loc) · 67.1 KB
/
DataView.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Text;
namespace System.Data
{
/// <summary>
/// Represents a databindable, customized view of a <see cref='System.Data.DataTable'/>
/// for sorting, filtering, searching, editing, and navigation.
/// </summary>
[Designer("Microsoft.VSDesigner.Data.VS.DataViewDesigner, Microsoft.VSDesigner, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
[DefaultProperty(nameof(Table))]
[DefaultEvent("PositionChanged")]
[Editor("Microsoft.VSDesigner.Data.Design.DataSourceEditor, Microsoft.VSDesigner, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a",
"System.Drawing.Design.UITypeEditor, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class DataView : MarshalByValueComponent, IBindingListView, System.ComponentModel.ITypedList, ISupportInitializeNotification
{
private DataViewManager? _dataViewManager;
private DataTable? _table;
private bool _locked;
private Index? _index;
private Dictionary<string, Index>? _findIndexes;
private string _sort = string.Empty;
/// <summary>Allow a user implemented comparison of two DataRow</summary>
/// <remarks>User must use correct DataRowVersion in comparison or index corruption will happen</remarks>
private System.Comparison<DataRow>? _comparison;
/// <summary>
/// IFilter will allow LinqDataView to wrap <see cref='System.Predicate<DataRow>'/> instead of using a DataExpression
/// </summary>
private IFilter? _rowFilter;
private DataViewRowState _recordStates = DataViewRowState.CurrentRows;
private bool _shouldOpen = true;
private bool _open;
private bool _allowNew = true;
private bool _allowEdit = true;
private bool _allowDelete = true;
private bool _applyDefaultSort;
internal DataRow? _addNewRow;
private ListChangedEventArgs? _addNewMoved;
private System.ComponentModel.ListChangedEventHandler? _onListChanged;
internal static ListChangedEventArgs s_resetEventArgs = new ListChangedEventArgs(ListChangedType.Reset, -1);
private DataTable? _delayedTable;
private string? _delayedRowFilter;
private string? _delayedSort;
private DataViewRowState _delayedRecordStates = (DataViewRowState)(-1);
private bool _fInitInProgress;
private bool _fEndInitInProgress;
/// <summary>
/// You can't delay create the DataRowView instances since multiple thread read access is valid
/// and each thread must obtain the same DataRowView instance and we want to avoid (inter)locking.
/// </summary>
/// <remarks>
/// In V1.1, the DataRowView[] was recreated after every change. Each DataRowView was bound to a DataRow.
/// In V2.0 Whidbey, the DataRowView retained but bound to an index instead of DataRow, allowing the DataRow to vary.
/// In V2.0 Orcas, the DataRowView retained and bound to a DataRow, allowing the index to vary.
/// </remarks>
private Dictionary<DataRow, DataRowView> _rowViewCache = new Dictionary<DataRow, DataRowView>(DataRowReferenceComparer.s_default);
/// <summary>
/// This collection allows expression maintenance to (add / remove) from the index when it really should be a (change / move).
/// </summary>
private readonly Dictionary<DataRow, DataRowView> _rowViewBuffer = new Dictionary<DataRow, DataRowView>(DataRowReferenceComparer.s_default);
private sealed class DataRowReferenceComparer : IEqualityComparer<DataRow>
{
internal static readonly DataRowReferenceComparer s_default = new DataRowReferenceComparer();
private DataRowReferenceComparer() { }
public bool Equals(DataRow? x, DataRow? y) => x == (object?)y;
public int GetHashCode(DataRow obj) => obj._objectID;
}
private readonly DataViewListener _dvListener;
private static int s_objectTypeCount; // Bid counter
private readonly int _objectID = System.Threading.Interlocked.Increment(ref s_objectTypeCount);
internal DataView(DataTable? table, bool locked)
{
GC.SuppressFinalize(this);
DataCommonEventSource.Log.Trace("<ds.DataView.DataView|INFO> {0}, table={1}, locked={2}", ObjectID, (table != null) ? table.ObjectID : 0, locked);
_dvListener = new DataViewListener(this);
_locked = locked;
_table = table;
_dvListener.RegisterMetaDataEvents(_table);
}
/// <summary>
/// Initializes a new instance of the <see cref='System.Data.DataView'/> class.
/// </summary>
public DataView() : this(null)
{
SetIndex2("", DataViewRowState.CurrentRows, null, true);
}
/// <summary>
/// Initializes a new instance of the <see cref='System.Data.DataView'/> class with the
/// specified <see cref='System.Data.DataTable'/>.
/// </summary>
public DataView(DataTable? table) : this(table, false)
{
SetIndex2("", DataViewRowState.CurrentRows, null, true);
}
/// <summary>
/// Initializes a new instance of the <see cref='System.Data.DataView'/> class with the
/// specified <see cref='System.Data.DataTable'/>.
/// </summary>
[RequiresUnreferencedCode(Select.RequiresUnreferencedCodeMessage)]
public DataView(DataTable table, string? RowFilter, string? Sort, DataViewRowState RowState)
{
GC.SuppressFinalize(this);
DataCommonEventSource.Log.Trace("<ds.DataView.DataView|API> {0}, table={1}, RowFilter='{2}', Sort='{3}', RowState={4}",
ObjectID, (table != null) ? table.ObjectID : 0, RowFilter, Sort, RowState);
if (table == null)
{
throw ExceptionBuilder.CanNotUse();
}
_dvListener = new DataViewListener(this);
_locked = false;
_table = table;
_dvListener.RegisterMetaDataEvents(_table);
if ((((int)RowState) & ((int)~(DataViewRowState.CurrentRows | DataViewRowState.OriginalRows))) != 0)
{
throw ExceptionBuilder.RecordStateRange();
}
else if ((((int)RowState) & ((int)DataViewRowState.ModifiedOriginal)) != 0 &&
(((int)RowState) & ((int)DataViewRowState.ModifiedCurrent)) != 0)
{
throw ExceptionBuilder.SetRowStateFilter();
}
Sort ??= string.Empty;
RowFilter ??= string.Empty;
DataExpression newFilter = new DataExpression(table, RowFilter);
SetIndex(Sort, RowState, newFilter);
}
internal DataView(DataTable table, System.Predicate<DataRow>? predicate, System.Comparison<DataRow>? comparison, DataViewRowState RowState)
{
GC.SuppressFinalize(this);
DataCommonEventSource.Log.Trace("<ds.DataView.DataView|API> %d#, table=%d, RowState=%d{ds.DataViewRowState}\n",
ObjectID, (table != null) ? table.ObjectID : 0, (int)RowState);
if (table == null)
{
throw ExceptionBuilder.CanNotUse();
}
_dvListener = new DataViewListener(this);
_locked = false;
_table = table;
_dvListener.RegisterMetaDataEvents(table);
if ((((int)RowState) & ((int)~(DataViewRowState.CurrentRows | DataViewRowState.OriginalRows))) != 0)
{
throw ExceptionBuilder.RecordStateRange();
}
else if ((((int)RowState) & ((int)DataViewRowState.ModifiedOriginal)) != 0 &&
(((int)RowState) & ((int)DataViewRowState.ModifiedCurrent)) != 0)
{
throw ExceptionBuilder.SetRowStateFilter();
}
_comparison = comparison;
SetIndex2("", RowState, ((null != predicate) ? new RowPredicateFilter(predicate) : null), true);
}
/// <summary>
/// Sets or gets a value indicating whether deletes are allowed.
/// </summary>
[DefaultValue(true)]
public bool AllowDelete
{
get { return _allowDelete; }
set
{
if (_allowDelete != value)
{
_allowDelete = value;
OnListChanged(s_resetEventArgs);
}
}
}
/// <summary>
/// Gets or sets a value indicating whether to use the default sort.
/// </summary>
[RefreshProperties(RefreshProperties.All)]
[DefaultValue(false)]
public bool ApplyDefaultSort
{
get { return _applyDefaultSort; }
set
{
DataCommonEventSource.Log.Trace("<ds.DataView.set_ApplyDefaultSort|API> {0}, {1}", ObjectID, value);
if (_applyDefaultSort != value)
{
_comparison = null; // clear the delegate to allow the Sort string to be effective
_applyDefaultSort = value;
UpdateIndex(true);
OnListChanged(s_resetEventArgs);
}
}
}
/// <summary>
/// Gets or sets a value indicating whether edits are allowed.
/// </summary>
[DefaultValue(true)]
public bool AllowEdit
{
get { return _allowEdit; }
set
{
if (_allowEdit != value)
{
_allowEdit = value;
OnListChanged(s_resetEventArgs);
}
}
}
/// <summary>
/// Gets or sets a value indicating whether the new rows can
/// be added using the <see cref='System.Data.DataView.AddNew'/>
/// method.
/// </summary>
[DefaultValue(true)]
public bool AllowNew
{
get { return _allowNew; }
set
{
if (_allowNew != value)
{
_allowNew = value;
OnListChanged(s_resetEventArgs);
}
}
}
/// <summary>
/// Gets the number of records in the <see cref='System.Data.DataView'/>.
/// </summary>
[Browsable(false)]
public int Count
{
get
{
Debug.Assert(_rowViewCache.Count == CountFromIndex, "DataView.Count mismatch");
return _rowViewCache.Count;
}
}
private int CountFromIndex => ((null != _index) ? _index.RecordCount : 0) + ((null != _addNewRow) ? 1 : 0);
/// <summary>
/// Gets the <see cref='System.Data.DataViewManager'/> associated with this <see cref='System.Data.DataView'/> .
/// </summary>
[Browsable(false)]
public DataViewManager? DataViewManager => _dataViewManager;
[Browsable(false)]
public bool IsInitialized => !_fInitInProgress;
/// <summary>
/// Gets a value indicating whether the data source is currently open and
/// projecting views of data on the <see cref='System.Data.DataTable'/>.
/// </summary>
[Browsable(false)]
protected bool IsOpen => _open;
bool ICollection.IsSynchronized => false;
/// <summary>
/// Gets or sets the expression used to filter which rows are viewed in the <see cref='System.Data.DataView'/>.
/// </summary>
[DefaultValue("")]
public virtual string? RowFilter
{
get
{
DataExpression? expression = (_rowFilter as DataExpression);
return (expression == null ? "" : expression.Expression); // CONSIDER: return optimized expression here
}
[RequiresUnreferencedCode(Select.RequiresUnreferencedCodeMessage)]
set
{
value ??= string.Empty;
DataCommonEventSource.Log.Trace("<ds.DataView.set_RowFilter|API> {0}, '{1}'", ObjectID, value);
if (_fInitInProgress)
{
_delayedRowFilter = value;
return;
}
CultureInfo locale = (_table != null ? _table.Locale : CultureInfo.CurrentCulture);
if (null == _rowFilter || (string.Compare(RowFilter, value, false, locale) != 0))
{
DataExpression newFilter = new DataExpression(_table, value);
SetIndex(_sort, _recordStates, newFilter);
}
}
}
#region RowPredicateFilter
/// <summary>
/// The predicate delegate that will determine if a DataRow should be contained within the view.
/// This RowPredicate property is mutually exclusive with the RowFilter property.
/// </summary>
internal Predicate<DataRow>? RowPredicate
{
get
{
RowPredicateFilter? filter = GetFilter() as RowPredicateFilter;
return filter?._predicateFilter;
}
set
{
if (!ReferenceEquals(RowPredicate, value))
{
SetIndex(Sort, RowStateFilter, ((null != value) ? new RowPredicateFilter(value) : null));
}
}
}
private sealed class RowPredicateFilter : System.Data.IFilter
{
internal readonly Predicate<DataRow> _predicateFilter;
/// <summary></summary>
internal RowPredicateFilter(Predicate<DataRow> predicate)
{
Debug.Assert(null != predicate, "null predicate");
_predicateFilter = predicate;
}
/// <summary></summary>
bool IFilter.Invoke(DataRow row, DataRowVersion version)
{
Debug.Assert(DataRowVersion.Default != version, "not expecting Default");
Debug.Assert(DataRowVersion.Proposed != version, "not expecting Proposed");
return _predicateFilter(row);
}
}
#endregion
/// <summary>
/// Gets or sets the row state filter used in the <see cref='System.Data.DataView'/>.
/// </summary>
[DefaultValue(DataViewRowState.CurrentRows)]
public DataViewRowState RowStateFilter
{
get { return _recordStates; }
set
{
DataCommonEventSource.Log.Trace("<ds.DataView.set_RowStateFilter|API> {0}, {1}", ObjectID, value);
if (_fInitInProgress)
{
_delayedRecordStates = value;
return;
}
if ((((int)value) & ((int)~(DataViewRowState.CurrentRows | DataViewRowState.OriginalRows))) != 0)
{
throw ExceptionBuilder.RecordStateRange();
}
else if ((((int)value) & ((int)DataViewRowState.ModifiedOriginal)) != 0 &&
(((int)value) & ((int)DataViewRowState.ModifiedCurrent)) != 0)
{
throw ExceptionBuilder.SetRowStateFilter();
}
if (_recordStates != value)
{
SetIndex(_sort, value, _rowFilter);
}
}
}
/// <summary>
/// Gets or sets the sort column or columns, and sort order for the table.
/// </summary>
[AllowNull]
[DefaultValue("")]
public string Sort
{
get
{
if (_sort.Length == 0 && _applyDefaultSort && _table != null && _table._primaryIndex.Length > 0)
{
return DataTable.FormatSortString(_table._primaryIndex);
}
else
{
return _sort;
}
}
set
{
value ??= string.Empty;
DataCommonEventSource.Log.Trace("<ds.DataView.set_Sort|API> {0}, '{1}'", ObjectID, value);
if (_fInitInProgress)
{
_delayedSort = value;
return;
}
CultureInfo locale = (_table != null ? _table.Locale : CultureInfo.CurrentCulture);
if (string.Compare(_sort, value, false, locale) != 0 || (null != _comparison))
{
CheckSort(value);
_comparison = null; // clear the delegate to allow the Sort string to be effective
SetIndex(value, _recordStates, _rowFilter);
}
}
}
/// <summary>Allow a user implemented comparison of two DataRow</summary>
/// <remarks>User must use correct DataRowVersion in comparison or index corruption will happen</remarks>
internal System.Comparison<DataRow>? SortComparison
{
get { return _comparison; }
set
{
DataCommonEventSource.Log.Trace("<ds.DataView.set_SortComparison|API> {0}", ObjectID);
if (!ReferenceEquals(_comparison, value))
{
_comparison = value;
SetIndex("", _recordStates, _rowFilter);
}
}
}
object ICollection.SyncRoot => this;
/// <summary>
/// Gets or sets the source <see cref='System.Data.DataTable'/>.
/// </summary>
[TypeConverterAttribute(typeof(DataTableTypeConverter))]
[DefaultValue(null)]
[RefreshProperties(RefreshProperties.All)]
public DataTable? Table
{
get { return _table; }
set
{
DataCommonEventSource.Log.Trace("<ds.DataView.set_Table|API> {0}, {1}", ObjectID, (value != null) ? value.ObjectID : 0);
if (_fInitInProgress && value != null)
{
_delayedTable = value;
return;
}
if (_locked)
{
throw ExceptionBuilder.SetTable();
}
if (_dataViewManager != null)
{
throw ExceptionBuilder.CanNotSetTable();
}
if (value != null && value.TableName.Length == 0)
{
throw ExceptionBuilder.CanNotBindTable();
}
if (_table != value)
{
_dvListener.UnregisterMetaDataEvents();
_table = value;
if (_table != null)
{
_dvListener.RegisterMetaDataEvents(_table);
}
SetIndex2("", DataViewRowState.CurrentRows, null, false);
if (_table != null)
{
OnListChanged(new ListChangedEventArgs(ListChangedType.PropertyDescriptorChanged, new DataTablePropertyDescriptor(_table)));
}
// index was updated without firing the reset, fire it now
OnListChanged(s_resetEventArgs);
}
}
}
object? IList.this[int recordIndex]
{
get { return this[recordIndex]; }
set { throw ExceptionBuilder.SetIListObject(); }
}
/// <summary>
/// Gets a row of data from a specified table.
/// </summary>
public DataRowView this[int recordIndex] => GetRowView(GetRow(recordIndex));
/// <summary>
/// Adds a new row of data to view.
/// </summary>
/// <remarks>
/// Only one new row of data allowed at a time, so previous new row will be added to row collection.
/// Unsupported pattern: dataTable.Rows.Add(dataView.AddNew().Row)
/// </remarks>
public virtual DataRowView AddNew()
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataView.AddNew|API> {0}", ObjectID);
try
{
CheckOpen();
if (!AllowNew)
{
throw ExceptionBuilder.AddNewNotAllowNull();
}
if (_addNewRow != null)
{
_rowViewCache[_addNewRow].EndEdit();
}
Debug.Assert(null == _addNewRow, "AddNew addNewRow is not null");
// TODO: This will throw NRE if _table isn't set (e.g. default ctor)
_addNewRow = _table!.NewRow();
DataRowView drv = new DataRowView(this, _addNewRow);
_rowViewCache.Add(_addNewRow, drv);
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemAdded, IndexOf(drv)));
return drv;
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
public void BeginInit()
{
_fInitInProgress = true;
}
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
Justification = "Warning related to RowFilter has already been shown when RowFilter was delay set.")]
public void EndInit()
{
if (_delayedTable != null && _delayedTable.fInitInProgress)
{
_delayedTable._delayedViews.Add(this);
return;
}
_fInitInProgress = false;
_fEndInitInProgress = true;
if (_delayedTable != null)
{
Table = _delayedTable;
_delayedTable = null;
}
if (_delayedSort != null)
{
Sort = _delayedSort;
_delayedSort = null;
}
if (_delayedRowFilter != null)
{
RowFilter = _delayedRowFilter;
_delayedRowFilter = null;
}
if (_delayedRecordStates != (DataViewRowState)(-1))
{
RowStateFilter = _delayedRecordStates;
_delayedRecordStates = (DataViewRowState)(-1);
}
_fEndInitInProgress = false;
SetIndex(Sort, RowStateFilter, _rowFilter);
OnInitialized();
}
private void CheckOpen()
{
if (!IsOpen) throw ExceptionBuilder.NotOpen();
}
private void CheckSort(string sort)
{
if (_table == null)
{
throw ExceptionBuilder.CanNotUse();
}
if (sort.Length == 0)
{
return;
}
_table.ParseSortString(sort);
}
/// <summary>
/// Closes the <see cref='System.Data.DataView'/>
/// </summary>
protected void Close()
{
_shouldOpen = false;
UpdateIndex();
_dvListener.UnregisterMetaDataEvents();
}
public void CopyTo(Array array, int index)
{
if (null != _index)
{
RBTree<int>.RBTreeEnumerator iterator = _index.GetEnumerator(0);
while (iterator.MoveNext())
{
array.SetValue(GetRowView(iterator.Current), index);
checked
{
index++;
}
}
}
if (null != _addNewRow)
{
array.SetValue(_rowViewCache[_addNewRow], index);
}
}
private void CopyTo(DataRowView[] array, int index)
{
if (null != _index)
{
RBTree<int>.RBTreeEnumerator iterator = _index.GetEnumerator(0);
while (iterator.MoveNext())
{
array[index] = GetRowView(iterator.Current);
checked
{
index++;
}
}
}
if (null != _addNewRow)
{
array[index] = _rowViewCache[_addNewRow];
}
}
/// <summary>
/// Deletes a row at the specified index.
/// </summary>
public void Delete(int index) => Delete(GetRow(index));
internal void Delete(DataRow row)
{
if (null != row)
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataView.Delete|API> {0}, row={1}", ObjectID, row._objectID);
try
{
CheckOpen();
if (row == _addNewRow)
{
FinishAddNew(false);
return;
}
if (!AllowDelete)
{
throw ExceptionBuilder.CanNotDelete();
}
row.Delete();
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
Close();
}
base.Dispose(disposing);
}
/// <summary>
/// Finds a row in the <see cref='System.Data.DataView'/> by the specified primary key value.
/// </summary>
public int Find(object? key) => FindByKey(key);
/// <summary>Find index of a DataRowView instance that matches the specified primary key value.</summary>
// TODO: This will throw NRE if _index isn't set (e.g. default ctor)
internal virtual int FindByKey(object? key) => _index!.FindRecordByKey(key);
/// <summary>
/// Finds a row in the <see cref='System.Data.DataView'/> by the specified primary key values.
/// </summary>
public int Find(object?[] key) => FindByKey(key);
/// <summary>Find index of a DataRowView instance that matches the specified primary key values.</summary>
// TODO: This will throw NRE if _index isn't set (e.g. default ctor)
internal virtual int FindByKey(object?[] key) => _index!.FindRecordByKey(key);
/// <summary>
/// Finds a row in the <see cref='System.Data.DataView'/> by the specified primary key value.
/// </summary>
public DataRowView[] FindRows(object? key) => FindRowsByKey(new object?[] { key });
/// <summary>
/// Finds a row in the <see cref='System.Data.DataView'/> by the specified primary key values.
/// </summary>
public DataRowView[] FindRows(object?[] key) => FindRowsByKey(key);
/// <summary>Find DataRowView instances that match the specified primary key values.</summary>
internal virtual DataRowView[] FindRowsByKey(object?[] key)
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataView.FindRows|API> {0}", ObjectID);
try
{
// TODO: This will throw NRE if _index isn't set (e.g. default ctor)
Range range = _index!.FindRecords(key);
return GetDataRowViewFromRange(range);
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
/// <summary>This method exists for LinqDataView to keep a level of abstraction away from the RBTree</summary>
internal Range FindRecords<TKey, TRow>(Index.ComparisonBySelector<TKey, TRow> comparison, TKey key) where TRow : DataRow
{
// TODO: This will throw NRE if _index isn't set (e.g. default ctor)
return _index!.FindRecords(comparison, key);
}
/// <summary>Convert a Range into a DataRowView[].</summary>
internal DataRowView[] GetDataRowViewFromRange(Range range)
{
if (range.IsNull)
{
return Array.Empty<DataRowView>();
}
var rows = new DataRowView[range.Count];
for (int i = 0; i < rows.Length; i++)
{
rows[i] = this[i + range.Min];
}
return rows;
}
internal void FinishAddNew(bool success)
{
Debug.Assert(null != _addNewRow, "null addNewRow");
DataCommonEventSource.Log.Trace("<ds.DataView.FinishAddNew|INFO> {0}, success={1}", ObjectID, success);
DataRow newRow = _addNewRow;
if (success)
{
if (DataRowState.Detached == newRow.RowState)
{
// MaintainDataView will translate the ItemAdded from the RowCollection into
// into either an ItemMoved or no event, since it didn't change position.
// also possible it's added to the RowCollection but filtered out of the view.
_table!.Rows.Add(newRow);
}
else
{
// this means that the record was added to the table by different means and not part of view
newRow.EndEdit();
}
}
if (newRow == _addNewRow)
{
// this means that the record did not get to the view
bool flag = _rowViewCache.Remove(_addNewRow);
Debug.Assert(flag, "didn't remove addNewRow");
_addNewRow = null;
if (!success)
{
newRow.CancelEdit();
}
OnListChanged(new ListChangedEventArgs(ListChangedType.ItemDeleted, Count));
}
}
/// <summary>
/// xGets an enumerator for this <see cref='System.Data.DataView'/>.
/// </summary>
public IEnumerator GetEnumerator()
{
// V1.1 compatibility: returning List<DataRowView>.GetEnumerator() from RowViewCache
// prevents users from changing data without invalidating the enumerator
// aka don't 'return this.RowViewCache.GetEnumerator()'
var temp = new DataRowView[Count];
CopyTo(temp, 0);
return temp.GetEnumerator();
}
#region IList
bool IList.IsReadOnly => false;
bool IList.IsFixedSize => false;
int IList.Add(object? value)
{
if (value == null)
{
// null is default value, so we AddNew.
AddNew();
return Count - 1;
}
throw ExceptionBuilder.AddExternalObject();
}
void IList.Clear()
{
throw ExceptionBuilder.CanNotClear();
}
bool IList.Contains(object? value) => (0 <= IndexOf(value as DataRowView));
int IList.IndexOf(object? value) => IndexOf(value as DataRowView);
/// <summary>Return positional index of a <see cref="DataRowView"/> in this DataView</summary>
/// <remarks>Behavioral change: will now return -1 once a DataRowView becomes detached.</remarks>
internal int IndexOf(DataRowView? rowview)
{
if (null != rowview)
{
if (ReferenceEquals(_addNewRow, rowview.Row))
{
return Count - 1;
}
if ((null != _index) && (DataRowState.Detached != rowview.Row.RowState))
{
DataRowView? cached; // verify the DataRowView is one we currently track - not something previously detached
if (_rowViewCache.TryGetValue(rowview.Row, out cached) && cached == (object)rowview)
{
return IndexOfDataRowView(rowview);
}
}
}
return -1;
}
private int IndexOfDataRowView(DataRowView rowview)
{
// rowview.GetRecord() may return the proposed record
// the index will only contain the original or current record, never proposed.
// return index.GetIndex(rowview.GetRecord());
return _index!.GetIndex(rowview.Row.GetRecordFromVersion(rowview.Row.GetDefaultRowVersion(RowStateFilter) & ~DataRowVersion.Proposed));
}
void IList.Insert(int index, object? value)
{
throw ExceptionBuilder.InsertExternalObject();
}
void IList.Remove(object? value)
{
int index = IndexOf(value as DataRowView);
if (0 <= index)
{
// must delegate to IList.RemoveAt
((IList)this).RemoveAt(index);
}
else
{
throw ExceptionBuilder.RemoveExternalObject();
}
}
void IList.RemoveAt(int index) => Delete(index);
internal Index? GetFindIndex(string column, bool keepIndex)
{
_findIndexes ??= new Dictionary<string, Index>();
Index? findIndex;
if (_findIndexes.TryGetValue(column, out findIndex))
{
if (!keepIndex)
{
_findIndexes.Remove(column);
findIndex.RemoveRef();
if (findIndex.RefCount == 1)
{ // if we have created it and we are removing it, refCount is (1)
findIndex.RemoveRef(); // if we are reusing the index created by others, refcount is (2)
}
}
}
else
{
if (keepIndex)
{
findIndex = _table!.GetIndex(column, _recordStates, GetFilter());
_findIndexes[column] = findIndex;
findIndex.AddRef();
}
}
return findIndex;
}
#endregion
#region IBindingList implementation
bool IBindingList.AllowNew => AllowNew;
object IBindingList.AddNew() => AddNew();
bool IBindingList.AllowEdit => AllowEdit;
bool IBindingList.AllowRemove => AllowDelete;
bool IBindingList.SupportsChangeNotification => true;
bool IBindingList.SupportsSearching => true;
bool IBindingList.SupportsSorting => true;
bool IBindingList.IsSorted => Sort.Length != 0;
PropertyDescriptor? IBindingList.SortProperty => GetSortProperty();
internal PropertyDescriptor? GetSortProperty()
{
if (_table != null && _index != null && _index._indexFields.Length == 1)
{
return new DataColumnPropertyDescriptor(_index._indexFields[0].Column);
}
return null;
}
ListSortDirection IBindingList.SortDirection => (_index!._indexFields.Length == 1 && _index._indexFields[0].IsDescending) ?
ListSortDirection.Descending :
ListSortDirection.Ascending;
#endregion
#region ListChanged & Initialized events
/// <summary>
/// Occurs when the list managed by the <see cref='System.Data.DataView'/> changes.
/// </summary>
public event ListChangedEventHandler? ListChanged
{
add
{
DataCommonEventSource.Log.Trace("<ds.DataView.add_ListChanged|API> {0}", ObjectID);
_onListChanged += value;
}
remove
{
DataCommonEventSource.Log.Trace("<ds.DataView.remove_ListChanged|API> {0}", ObjectID);
_onListChanged -= value;
}
}
public event EventHandler? Initialized;
#endregion
#region IBindingList implementation
void IBindingList.AddIndex(PropertyDescriptor property) => GetFindIndex(property.Name, keepIndex: true);
void IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction)
{
Sort = CreateSortString(property, direction);
}
int IBindingList.Find(PropertyDescriptor property, object key)
{