System.Data.XmlSchemaDataImporter.ProcessSelfIdentity C# (CSharp) Method

		private void ProcessSelfIdentity (ConstraintStructure c)
		{
			// Basic concept came from XmlSchemaMapper.cs

			string tableName = c.TableName;
			
			DataTable dt = dataset.Tables [tableName];
			if (dt == null) {
				if (forDataSet)
					throw new DataException (String.Format ("Invalid XPath selection inside selector. Cannot find: {0}", tableName));
				else
					// nonexistent table name. .NET ignores it for DataTable.ReadXmlSchema().
					return;
			}

			DataColumn [] cols = new DataColumn [c.Columns.Length];
			for (int i = 0; i < cols.Length; i++) {
				string colName = c.Columns [i];
				bool isAttr = c.IsAttribute [i];
				DataColumn col = dt.Columns [colName];
				if (col == null)
					throw new DataException (String.Format ("Invalid XPath selection inside field. Cannot find: {0}", tableName));
				if (isAttr && col.ColumnMapping != MappingType.Attribute)
					throw new DataException ("The XPath specified attribute field, but mapping type is not attribute.");
				if (!isAttr && col.ColumnMapping != MappingType.Element)
					throw new DataException ("The XPath specified simple element field, but mapping type is not simple element.");

				cols [i] = dt.Columns [colName];
			}
			
			bool isPK = c.IsPrimaryKey;
			string constraintName = c.ConstraintName;
			dt.Constraints.Add (new UniqueConstraint (
				constraintName, cols, isPK));
		}