public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
System.Reflection.ConstructorInfo ctor = null;
object[] values = null;
if (destinationType == typeof(InstanceDescriptor) && value is DataRelation)
{
DataRelation rel = (DataRelation)value;
DataTable parentTable = rel.ParentKey.Table;
DataTable childTable = rel.ChildKey.Table;
if (string.IsNullOrEmpty(parentTable.Namespace) && string.IsNullOrEmpty(childTable.Namespace))
{
ctor = typeof(DataRelation).GetConstructor(new Type[] { typeof(string) /*relationName*/, typeof(string) /*parentTableName*/, typeof(string) /*childTableName */,
typeof(string[]) /*parentColumnNames */, typeof(string[]) /*childColumnNames*/, typeof(bool) /*nested*/ });
values = new object[] { rel.RelationName, rel.ParentKey.Table.TableName, rel.ChildKey.Table.TableName, rel.ParentColumnNames, rel.ChildColumnNames, rel.Nested };
}
else
{
ctor = typeof(DataRelation).GetConstructor(new Type[] { typeof(string)/*relationName*/, typeof(string)/*parentTableName*/, typeof(string)/*parentTableNamespace*/,
typeof(string)/*childTableName */, typeof(string)/*childTableNamespace */,
typeof(string[])/*parentColumnNames */, typeof(string[]) /*childColumnNames*/, typeof(bool) /*nested*/});
values = new object[] { rel.RelationName, rel.ParentKey.Table.TableName, rel.ParentKey.Table.Namespace, rel.ChildKey.Table.TableName,
rel.ChildKey.Table.Namespace, rel.ParentColumnNames, rel.ChildColumnNames, rel.Nested };
}
return new InstanceDescriptor(ctor, values);
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
