internal void AddAt(int index, DataColumn column)
{
if (column != null && column.ColumnMapping == MappingType.SimpleContent)
{
if (_table.XmlText != null && _table.XmlText != column)
{
throw ExceptionBuilder.CannotAddColumn3();
}
if (_table.ElementColumnCount > 0)
{
throw ExceptionBuilder.CannotAddColumn4(column.ColumnName);
}
OnCollectionChanging(new CollectionChangeEventArgs(CollectionChangeAction.Add, column));
BaseAdd(column);
if (index != -1)
{
ArrayAdd(index, column);
}
else
{
ArrayAdd(column);
}
_table.XmlText = column;
}
else
{
OnCollectionChanging(new CollectionChangeEventArgs(CollectionChangeAction.Add, column));
BaseAdd(column);
if (index != -1)
{
ArrayAdd(index, column);
}
else
{
ArrayAdd(column);
}
// if the column is an element increase the internal dataTable counter
if (column.ColumnMapping == MappingType.Element)
{
_table.ElementColumnCount++;
}
}
if (!_table.fInitInProgress && column != null && column.Computed)
{
column.CopyExpressionFrom(column);
}
OnCollectionChanged(new CollectionChangeEventArgs(CollectionChangeAction.Add, column));
}
internal void MergeDataSet(DataSet source)
{
Debug.Assert(_dataSet != null);
if (source == _dataSet)
{
return; //somebody is doing an 'automerge'
}
bool fEnforce = _dataSet.EnforceConstraints;
_dataSet.EnforceConstraints = false;
_IgnoreNSforTableLookup = (_dataSet._namespaceURI != source._namespaceURI); // if two DataSets have different
// Namespaces, ignore NS for table lookups as we won't be able to find the right tables which inherits its NS
List <DataColumn>?existingColumns = null; // need to cache existing columns
if (MissingSchemaAction.Add == _missingSchemaAction)
{
existingColumns = new List <DataColumn>(); // need to cache existing columns
foreach (DataTable dt in _dataSet.Tables)
{
foreach (DataColumn dc in dt.Columns)
{
existingColumns.Add(dc);
}
}
}
for (int i = 0; i < source.Tables.Count; i++)
{
MergeTableData(source.Tables[i]); // since column expression might have dependency on relation, we do not set
//column expression at this point. We need to set it after adding relations
}
if (MissingSchemaAction.Ignore != _missingSchemaAction)
{
// Add all independent constraints
MergeConstraints(source);
// Add all relationships
for (int i = 0; i < source.Relations.Count; i++)
{
MergeRelation(source.Relations[i]);
}
}
if (MissingSchemaAction.Add == _missingSchemaAction)
{
// for which other options we should add expressions also?
foreach (DataTable sourceTable in source.Tables)
{
DataTable targetTable;
if (_IgnoreNSforTableLookup)
{
targetTable = _dataSet.Tables[sourceTable.TableName] !;
}
else
{
targetTable = _dataSet.Tables[sourceTable.TableName, sourceTable.Namespace] !; // we know that target table won't be null since MissingSchemaAction is Add , we have already added it!
}
foreach (DataColumn dc in sourceTable.Columns)
{
// Should we overwrite the previous expression column? No, refer to spec, if it is new column we need to add the schema
if (dc.Computed)
{
DataColumn targetColumn = targetTable.Columns[dc.ColumnName] !;
if (!existingColumns !.Contains(targetColumn))
{
targetColumn.CopyExpressionFrom(dc);
}
}
}
}
}
MergeExtendedProperties(source.ExtendedProperties, _dataSet.ExtendedProperties);
foreach (DataTable dt in _dataSet.Tables)
{
dt.EvaluateExpressions();
}
_dataSet.EnforceConstraints = fEnforce;
}
