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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.ComponentModel;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
namespace System.Data
{
/// <summary>
/// Represents the collection of relations,
/// each of which allows navigation between related parent/child tables.
/// </summary>
[DefaultEvent(nameof(CollectionChanged))]
[DefaultProperty("Table")]
[Editor("Microsoft.VSDesigner.Data.Design.DataRelationCollectionEditor, 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 abstract class DataRelationCollection : InternalDataCollectionBase
{
private DataRelation? _inTransition;
private int _defaultNameIndex = 1;
private CollectionChangeEventHandler? _onCollectionChangedDelegate;
private CollectionChangeEventHandler? _onCollectionChangingDelegate;
private static int s_objectTypeCount; // Bid counter
private readonly int _objectID = System.Threading.Interlocked.Increment(ref s_objectTypeCount);
internal int ObjectID => _objectID;
/// <summary>
/// Gets the relation specified by index.
/// </summary>
public abstract DataRelation this[int index] { get; }
/// <summary>
/// Gets the relation specified by name.
/// </summary>
public abstract DataRelation? this[string? name] { get; }
/// <summary>
/// Adds the relation to the collection.
/// </summary>
public void Add(DataRelation relation)
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataRelationCollection.Add|API> {0}, relation={1}", ObjectID, (relation != null) ? relation.ObjectID : 0);
try
{
if (_inTransition == relation)
{
return;
}
_inTransition = relation;
try
{
OnCollectionChanging(new CollectionChangeEventArgs(CollectionChangeAction.Add, relation));
AddCore(relation!);
OnCollectionChanged(new CollectionChangeEventArgs(CollectionChangeAction.Add, relation));
}
finally
{
_inTransition = null;
}
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
public virtual void AddRange(DataRelation[]? relations)
{
if (relations != null)
{
foreach (DataRelation relation in relations)
{
if (relation != null)
{
Add(relation);
}
}
}
}
/// <summary>
/// Creates a <see cref='System.Data.DataRelation'/> with the
/// specified name, parent columns,
/// child columns, and adds it to the collection.
/// </summary>
public virtual DataRelation Add(string? name, DataColumn[] parentColumns, DataColumn[] childColumns)
{
var relation = new DataRelation(name, parentColumns, childColumns);
Add(relation);
return relation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection. An ArgumentNullException is
/// thrown if this relation is null. An ArgumentException is thrown if this relation already belongs to
/// this collection, belongs to another collection, or if this collection already has a relation with the
/// same name (case insensitive).
/// An InvalidRelationException is thrown if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public virtual DataRelation Add(string? name, DataColumn[] parentColumns, DataColumn[] childColumns, bool createConstraints)
{
var relation = new DataRelation(name, parentColumns, childColumns, createConstraints);
Add(relation);
return relation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection. The name is defaulted.
/// An ArgumentException is thrown if
/// this relation already belongs to this collection or belongs to another collection.
/// An InvalidConstraintException is thrown if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public virtual DataRelation Add(DataColumn[] parentColumns, DataColumn[] childColumns)
{
var relation = new DataRelation(null, parentColumns, childColumns);
Add(relation);
return relation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection.
/// An ArgumentException is thrown if this relation already belongs to
/// this collection or belongs to another collection.
/// A DuplicateNameException is thrown if this collection already has a relation with the same
/// name (case insensitive).
/// An InvalidConstraintException is thrown if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public virtual DataRelation Add(string? name, DataColumn parentColumn, DataColumn childColumn)
{
var relation = new DataRelation(name, parentColumn, childColumn);
Add(relation);
return relation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection.
/// An ArgumentException is thrown if this relation already belongs to
/// this collection or belongs to another collection.
/// A DuplicateNameException is thrown if this collection already has a relation with the same
/// name (case insensitive).
/// An InvalidConstraintException is thrown if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public virtual DataRelation Add(string? name, DataColumn parentColumn, DataColumn childColumn, bool createConstraints)
{
var relation = new DataRelation(name, parentColumn, childColumn, createConstraints);
Add(relation);
return relation;
}
/// <summary>
/// Creates a relation given the parameters and adds it to the collection. The name is defaulted.
/// An ArgumentException is thrown if
/// this relation already belongs to this collection or belongs to another collection.
/// An InvalidConstraintException is thrown if the relation can't be created based on the parameters.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public virtual DataRelation Add(DataColumn parentColumn, DataColumn childColumn)
{
var relation = new DataRelation(null, parentColumn, childColumn);
Add(relation);
return relation;
}
/// <summary>
/// Does verification on the table.
/// An ArgumentNullException is thrown if this relation is null. An ArgumentException is thrown if this relation
/// already belongs to this collection, belongs to another collection.
/// A DuplicateNameException is thrown if this collection already has a relation with the same
/// name (case insensitive).
/// </summary>
protected virtual void AddCore(DataRelation relation)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.AddCore|INFO> {0}, relation={1}", ObjectID, (relation != null) ? relation.ObjectID : 0);
if (relation == null)
{
throw ExceptionBuilder.ArgumentNull(nameof(relation));
}
relation.CheckState();
DataSet dataSet = GetDataSet();
if (relation.DataSet == dataSet)
{
throw ExceptionBuilder.RelationAlreadyInTheDataSet();
}
if (relation.DataSet != null)
{
throw ExceptionBuilder.RelationAlreadyInOtherDataSet();
}
if (relation.ChildTable.Locale.LCID != relation.ParentTable.Locale.LCID ||
relation.ChildTable.CaseSensitive != relation.ParentTable.CaseSensitive)
{
throw ExceptionBuilder.CaseLocaleMismatch();
}
if (relation.Nested)
{
relation.CheckNamespaceValidityForNestedRelations(relation.ParentTable.Namespace);
relation.ValidateMultipleNestedRelations();
relation.ParentTable.ElementColumnCount++;
}
}
public event CollectionChangeEventHandler? CollectionChanged
{
add
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.add_CollectionChanged|API> {0}", ObjectID);
_onCollectionChangedDelegate += value;
}
remove
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.remove_CollectionChanged|API> {0}", ObjectID);
_onCollectionChangedDelegate -= value;
}
}
internal event CollectionChangeEventHandler? CollectionChanging
{
add
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.add_CollectionChanging|INFO> {0}", ObjectID);
_onCollectionChangingDelegate += value;
}
remove
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.remove_CollectionChanging|INFO> {0}", ObjectID);
_onCollectionChangingDelegate -= value;
}
}
/// <summary>
/// Creates a new default name.
/// </summary>
internal string AssignName()
{
string newName = MakeName(_defaultNameIndex);
_defaultNameIndex++;
return newName;
}
/// <summary>
/// Clears the collection of any relations.
/// </summary>
public virtual void Clear()
{
long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataRelationCollection.Clear|API> {0}", ObjectID);
try
{
int count = Count;
OnCollectionChanging(s_refreshEventArgs);
for (int i = count - 1; i >= 0; i--)
{
_inTransition = this[i];
RemoveCore(_inTransition);
}
OnCollectionChanged(s_refreshEventArgs);
_inTransition = null;
}
finally
{
DataCommonEventSource.Log.ExitScope(logScopeId);
}
}
/// <summary>
/// Returns true if this collection has a relation with the given name (case insensitive), false otherwise.
/// </summary>
public virtual bool Contains(string? name) => (InternalIndexOf(name) >= 0);
public void CopyTo(DataRelation[] array, int index)
{
if (array == null)
{
throw ExceptionBuilder.ArgumentNull(nameof(array));
}
if (index < 0)
{
throw ExceptionBuilder.ArgumentOutOfRange(nameof(index));
}
ArrayList alist = List;
if (array.Length - index < alist.Count)
{
throw ExceptionBuilder.InvalidOffsetLength();
}
for (int i = 0; i < alist.Count; ++i)
{
array[index + i] = (DataRelation)alist[i]!;
}
}
/// <summary>
/// Returns the index of a specified <see cref='System.Data.DataRelation'/>.
/// </summary>
public virtual int IndexOf(DataRelation? relation)
{
int relationCount = List.Count;
for (int i = 0; i < relationCount; ++i)
{
if (relation == (DataRelation)List[i]!)
{
return i;
}
}
return -1;
}
/// <summary>
/// Returns the index of the
/// relation with the given name (case insensitive), or -1 if the relation
/// doesn't exist in the collection.
/// </summary>
public virtual int IndexOf(string? relationName)
{
int index = InternalIndexOf(relationName);
return (index < 0) ? -1 : index;
}
internal int InternalIndexOf(string? name)
{
int cachedI = -1;
if ((null != name) && (0 < name.Length))
{
int count = List.Count;
for (int i = 0; i < count; i++)
{
DataRelation relation = (DataRelation)List[i]!;
int result = NamesEqual(relation.RelationName, name, false, GetDataSet().Locale);
if (result == 1)
{
return i;
}
if (result == -1)
{
cachedI = (cachedI == -1) ? i : -2;
}
}
}
return cachedI;
}
/// <summary>
/// Gets the dataSet for this collection.
/// </summary>
protected abstract DataSet GetDataSet();
/// <summary>
/// Makes a default name with the given index. e.g. Relation1, Relation2, ... Relationi
/// </summary>
private static string MakeName(int index) => index == 1 ?
"Relation1" :
"Relation" + index.ToString(System.Globalization.CultureInfo.InvariantCulture);
/// <summary>
/// This method is called whenever the collection changes. Overriders
/// of this method should call the base implementation of this method.
/// </summary>
protected virtual void OnCollectionChanged(CollectionChangeEventArgs ccevent)
{
if (_onCollectionChangedDelegate != null)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.OnCollectionChanged|INFO> {0}", ObjectID);
_onCollectionChangedDelegate(this, ccevent);
}
}
protected virtual void OnCollectionChanging(CollectionChangeEventArgs ccevent)
{
if (_onCollectionChangingDelegate != null)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.OnCollectionChanging|INFO> {0}", ObjectID);
_onCollectionChangingDelegate(this, ccevent);
}
}
/// <summary>
/// Registers this name as being used in the collection. Will throw an ArgumentException
/// if the name is already being used. Called by Add, All property, and Relation.RelationName property.
/// if the name is equivalent to the next default name to hand out, we increment our defaultNameIndex.
/// </summary>
internal void RegisterName(string name)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.RegisterName|INFO> {0}, name='{1}'", ObjectID, name);
Debug.Assert(name != null);
CultureInfo locale = GetDataSet().Locale;
int relationCount = Count;
for (int i = 0; i < relationCount; i++)
{
if (NamesEqual(name, this[i].RelationName, true, locale) != 0)
{
throw ExceptionBuilder.DuplicateRelation(this[i].RelationName);
}
}
if (NamesEqual(name, MakeName(_defaultNameIndex), true, locale) != 0)
{
_defaultNameIndex++;
}
}
/// <summary>
/// Verifies if a given relation can be removed from the collection.
/// </summary>
public virtual bool CanRemove(DataRelation? relation) => relation != null && relation.DataSet == GetDataSet();
/// <summary>
/// Removes the given relation from the collection.
/// An ArgumentNullException is thrown if this relation is null. An ArgumentException is thrown
/// if this relation doesn't belong to this collection.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public void Remove(DataRelation relation)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.Remove|API> {0}, relation={1}", ObjectID, (relation != null) ? relation.ObjectID : 0);
if (_inTransition == relation)
{
return;
}
_inTransition = relation;
try
{
OnCollectionChanging(new CollectionChangeEventArgs(CollectionChangeAction.Remove, relation));
RemoveCore(relation!);
OnCollectionChanged(new CollectionChangeEventArgs(CollectionChangeAction.Remove, relation));
}
finally
{
_inTransition = null;
}
}
/// <summary>
/// Removes the relation at the given index from the collection. An IndexOutOfRangeException is
/// thrown if this collection doesn't have a relation at this index.
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public void RemoveAt(int index)
{
DataRelation dr = this[index];
// TODO: Not needed, this[] throws
if (dr == null)
{
throw ExceptionBuilder.RelationOutOfRange(index);
}
Remove(dr);
}
/// <summary>
/// Removes the relation with the given name from the collection. An IndexOutOfRangeException is
/// thrown if this collection doesn't have a relation with that name
/// The CollectionChanged event is fired if it succeeds.
/// </summary>
public void Remove(string name)
{
DataRelation? dr = this[name];
if (dr == null)
{
throw ExceptionBuilder.RelationNotInTheDataSet(name);
}
Remove(dr);
}
/// <summary>
/// Does verification on the relation.
/// An ArgumentNullException is thrown if this relation is null. An ArgumentException is thrown
/// if this relation doesn't belong to this collection.
/// </summary>
protected virtual void RemoveCore(DataRelation relation)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.RemoveCore|INFO> {0}, relation={1}", ObjectID, (relation != null) ? relation.ObjectID : 0);
if (relation == null)
{
throw ExceptionBuilder.ArgumentNull(nameof(relation));
}
DataSet dataSet = GetDataSet();
if (relation.DataSet != dataSet)
{
throw ExceptionBuilder.RelationNotInTheDataSet(relation.RelationName);
}
if (relation.Nested)
{
relation.ParentTable.ElementColumnCount--;
relation.ParentTable.Columns.UnregisterName(relation.ChildTable.TableName);
}
}
/// <summary>
/// Unregisters this name as no longer being used in the collection. Called by Remove, All property, and
/// Relation.RelationName property. If the name is equivalent to the last proposed default name, we walk backwards
/// to find the next proper default name to use.
/// </summary>
internal void UnregisterName(string name)
{
DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.UnregisterName|INFO> {0}, name='{1}'", ObjectID, name);
if (NamesEqual(name, MakeName(_defaultNameIndex - 1), true, GetDataSet().Locale) != 0)
{
do
{
_defaultNameIndex--;
} while (_defaultNameIndex > 1 && !Contains(MakeName(_defaultNameIndex - 1)));
}
}
internal sealed class DataTableRelationCollection : DataRelationCollection
{
private readonly DataTable _table;
private readonly ArrayList _relations; // For caching purpose only to improve performance
private readonly bool _fParentCollection;
internal DataTableRelationCollection(DataTable table, bool fParentCollection)
{
if (table == null)
{
throw ExceptionBuilder.RelationTableNull();
}
_table = table;
_fParentCollection = fParentCollection;
_relations = new ArrayList();
}
protected override ArrayList List => _relations;
private void EnsureDataSet()
{
if (_table.DataSet == null)
{
throw ExceptionBuilder.RelationTableWasRemoved();
}
}
protected override DataSet GetDataSet()
{
EnsureDataSet();
return _table.DataSet!;
}
public override DataRelation this[int index]
{
get
{
if (index >= 0 && index < _relations.Count)
{
return (DataRelation)_relations[index]!;
}
throw ExceptionBuilder.RelationOutOfRange(index);
}
}
public override DataRelation? this[string? name]
{
get
{
int index = InternalIndexOf(name);
if (index == -2)
{
throw ExceptionBuilder.CaseInsensitiveNameConflict(name!);
}
return (index < 0) ? null : (DataRelation)List[index]!;
}
}
internal event CollectionChangeEventHandler? RelationPropertyChanged;
internal void OnRelationPropertyChanged(CollectionChangeEventArgs ccevent)
{
if (!_fParentCollection)
{
_table.UpdatePropertyDescriptorCollectionCache();
}
RelationPropertyChanged?.Invoke(this, ccevent);
}
private void AddCache(DataRelation relation)
{
_relations.Add(relation);
if (!_fParentCollection)
{
_table.UpdatePropertyDescriptorCollectionCache();
}
}
protected override void AddCore(DataRelation relation)
{
if (_fParentCollection)
{
if (relation.ChildTable != _table)
{
throw ExceptionBuilder.ChildTableMismatch();
}
}
else
{
if (relation.ParentTable != _table)
{
throw ExceptionBuilder.ParentTableMismatch();
}
}
GetDataSet().Relations.Add(relation);
AddCache(relation);
}
public override bool CanRemove(DataRelation? relation)
{
if (!base.CanRemove(relation))
{
return false;
}
Debug.Assert(relation != null);
if (_fParentCollection)
{
if (relation.ChildTable != _table)
{
return false;
}
}
else
{
if (relation.ParentTable != _table)
{
return false;
}
}
return true;
}
private void RemoveCache(DataRelation relation)
{
for (int i = 0; i < _relations.Count; i++)
{
if (relation == _relations[i])
{
_relations.RemoveAt(i);
if (!_fParentCollection)
{
_table.UpdatePropertyDescriptorCollectionCache();
}
return;
}
}
throw ExceptionBuilder.RelationDoesNotExist();
}
protected override void RemoveCore(DataRelation relation)
{
if (_fParentCollection)
{
if (relation.ChildTable != _table)
{
throw ExceptionBuilder.ChildTableMismatch();
}
}
else
{
if (relation.ParentTable != _table)
{
throw ExceptionBuilder.ParentTableMismatch();
}
}
GetDataSet().Relations.Remove(relation);
RemoveCache(relation);
}
}
internal sealed class DataSetRelationCollection : DataRelationCollection
{
private readonly DataSet _dataSet;
private readonly ArrayList _relations;
private DataRelation[]? _delayLoadingRelations;
internal DataSetRelationCollection(DataSet dataSet)
{
if (dataSet == null)
{
throw ExceptionBuilder.RelationDataSetNull();
}
_dataSet = dataSet;
_relations = new ArrayList();
}
protected override ArrayList List => _relations;
public override void AddRange(DataRelation[]? relations)
{
if (_dataSet._fInitInProgress)
{
_delayLoadingRelations = relations;
return;
}
if (relations != null)
{
foreach (DataRelation relation in relations)
{
if (relation != null)
{
Add(relation);
}
}
}
}
public override void Clear()
{
base.Clear();
if (_dataSet._fInitInProgress && _delayLoadingRelations != null)
{
_delayLoadingRelations = null;
}
}
protected override DataSet GetDataSet() => _dataSet;
public override DataRelation this[int index]
{
get
{
if (index >= 0 && index < _relations.Count)
{
return (DataRelation)_relations[index]!;
}
throw ExceptionBuilder.RelationOutOfRange(index);
}
}
public override DataRelation? this[string? name]
{
get
{
int index = InternalIndexOf(name);
if (index == -2)
{
throw ExceptionBuilder.CaseInsensitiveNameConflict(name!);
}
return (index < 0) ? null : (DataRelation)List[index]!;
}
}
protected override void AddCore(DataRelation relation)
{
base.AddCore(relation);
if (relation.ChildTable.DataSet != _dataSet || relation.ParentTable.DataSet != _dataSet)
{
throw ExceptionBuilder.ForeignRelation();
}
relation.CheckState();
if (relation.Nested)
{
relation.CheckNestedRelations();
}
if (relation._relationName.Length == 0)
{
relation._relationName = AssignName();
}
else
{
RegisterName(relation._relationName);
}
DataKey childKey = relation.ChildKey;
for (int i = 0; i < _relations.Count; i++)
{
if (childKey.ColumnsEqual(((DataRelation)_relations[i]!).ChildKey))
{
if (relation.ParentKey.ColumnsEqual(((DataRelation)_relations[i]!).ParentKey))
throw ExceptionBuilder.RelationAlreadyExists();
}
}
_relations.Add(relation);
((DataTableRelationCollection)(relation.ParentTable.ChildRelations)).Add(relation); // Caching in ParentTable -> ChildRelations
((DataTableRelationCollection)(relation.ChildTable.ParentRelations)).Add(relation); // Caching in ChildTable -> ParentRelations
relation.SetDataSet(_dataSet);
relation.ChildKey.GetSortIndex().AddRef();
if (relation.Nested)
{
relation.ChildTable.CacheNestedParent();
}
ForeignKeyConstraint? foreignKey = relation.ChildTable.Constraints.FindForeignKeyConstraint(relation.ParentColumnsReference, relation.ChildColumnsReference);
if (relation._createConstraints)
{
if (foreignKey == null)
{
relation.ChildTable.Constraints.Add(foreignKey = new ForeignKeyConstraint(relation.ParentColumnsReference, relation.ChildColumnsReference));
// try to name the fk constraint the same as the parent relation:
try
{
foreignKey.ConstraintName = relation.RelationName;
}
catch (Exception e) when (Common.ADP.IsCatchableExceptionType(e))
{
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
}
}
}
UniqueConstraint? key = relation.ParentTable.Constraints.FindKeyConstraint(relation.ParentColumnsReference);
relation.SetParentKeyConstraint(key);
relation.SetChildKeyConstraint(foreignKey);
}
protected override void RemoveCore(DataRelation relation)
{
base.RemoveCore(relation);
_dataSet.OnRemoveRelationHack(relation);
relation.SetDataSet(null);
relation.ChildKey.GetSortIndex().RemoveRef();
if (relation.Nested)
{
relation.ChildTable.CacheNestedParent();
}
for (int i = 0; i < _relations.Count; i++)
{
if (relation == _relations[i])
{
_relations.RemoveAt(i);
((DataTableRelationCollection)(relation.ParentTable.ChildRelations)).Remove(relation); // Remove Cache from ParentTable -> ChildRelations
((DataTableRelationCollection)(relation.ChildTable.ParentRelations)).Remove(relation); // Removing Cache from ChildTable -> ParentRelations
if (relation.Nested)
{
relation.ChildTable.CacheNestedParent();
}
UnregisterName(relation.RelationName);
relation.SetParentKeyConstraint(null);
relation.SetChildKeyConstraint(null);
return;
}
}
throw ExceptionBuilder.RelationDoesNotExist();
}
internal void FinishInitRelations()
{
if (_delayLoadingRelations == null)
{
return;
}
DataRelation rel;
int colCount;
DataColumn[] parents, childs;
for (int i = 0; i < _delayLoadingRelations.Length; i++)
{
rel = _delayLoadingRelations[i];
if (rel._parentColumnNames == null || rel._childColumnNames == null)
{
Add(rel);
continue;
}
colCount = rel._parentColumnNames.Length;
parents = new DataColumn[colCount];
childs = new DataColumn[colCount];
for (int j = 0; j < colCount; j++)
{
if (rel._parentTableNamespace == null)
{
parents[j] = _dataSet.Tables[rel._parentTableName!]!.Columns[rel._parentColumnNames[j]]!;
}
else
{
parents[j] = _dataSet.Tables[rel._parentTableName!, rel._parentTableNamespace]!.Columns[rel._parentColumnNames[j]]!;
}
if (rel._childTableNamespace == null)
{
childs[j] = _dataSet.Tables[rel._childTableName!]!.Columns[rel._childColumnNames[j]]!;
}
else
{
childs[j] = _dataSet.Tables[rel._childTableName!, rel._childTableNamespace]!.Columns[rel._childColumnNames[j]]!;
}
}
DataRelation newRelation = new DataRelation(rel._relationName, parents, childs, false);
newRelation.Nested = rel._nested;
Add(newRelation);
}
_delayLoadingRelations = null;
}
}
}
}
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