|
private CloneTo ( |
||
| clone | ||
| cloneDS | ||
| skipExpressionColumns | bool | |
| return | ||
private DataTable CloneHierarchy (DataTable sourceTable, DataSet ds, Hashtable visitedMap) {
if (visitedMap == null)
visitedMap = new Hashtable();
if (visitedMap.Contains(sourceTable))
return ((DataTable)visitedMap[sourceTable]);
DataTable destinationTable = ds.Tables[sourceTable.TableName, sourceTable.Namespace];
if ((destinationTable != null && destinationTable.Columns.Count > 0)) {
destinationTable = IncrementalCloneTo(sourceTable,destinationTable);
// get extra columns from source into destination , increamental read
}
else {
if (destinationTable == null) {
destinationTable = new DataTable();
// fxcop: new DataTable values for CaseSensitive, Locale, Namespace will come from CloneTo
ds.Tables.Add(destinationTable);
}
destinationTable = sourceTable.CloneTo(destinationTable, ds, true);
}
visitedMap[sourceTable] = destinationTable;
// start cloning relation
foreach( DataRelation r in sourceTable.ChildRelations ) {
DataTable childTable = CloneHierarchy((DataTable)r.ChildTable, ds, visitedMap);
}
return destinationTable;
}
private DataTable CloneHierarchy(DataTable sourceTable, System.Data.DataSet ds, Hashtable visitedMap)
{
if (visitedMap == null)
{
visitedMap = new Hashtable();
}
if (visitedMap.Contains(sourceTable))
{
return (DataTable) visitedMap[sourceTable];
}
DataTable targetTable = ds.Tables[sourceTable.TableName, sourceTable.Namespace];
if ((targetTable != null) && (targetTable.Columns.Count > 0))
{
targetTable = this.IncrementalCloneTo(sourceTable, targetTable);
}
else
{
if (targetTable == null)
{
targetTable = new DataTable();
ds.Tables.Add(targetTable);
}
targetTable = sourceTable.CloneTo(targetTable, ds, true);
}
visitedMap[sourceTable] = targetTable;
foreach (DataRelation relation in sourceTable.ChildRelations)
{
this.CloneHierarchy(relation.ChildTable, ds, visitedMap);
}
return targetTable;
}
