/// <summary>
/// Save the current state of the object so that you can revert to it if necessary.
/// </summary>
public void CreateSnapshot()
{
Type currentType;
Hashtable state = new Hashtable();
FieldInfo[] fields;
string fieldName;
_bindingEdit = true;
currentType = this.GetType();
do
{
// Get the member-fields of this type
fields = currentType.GetFields(BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Instance);
foreach (FieldInfo field in fields)
{
// If this field is declared in the current-type, and, it is
// a field that is undoable, then keep track of its state.
if (field.DeclaringType == currentType &&
this.IsUndoableField(field))
{
object fieldValue = field.GetValue(this);
// If the field is an IUndoable type, cascade the call.
IUndoable uf = fieldValue as IUndoable;
if (uf != null)
{
uf.CreateSnapshot();
}
else
{
fieldName = currentType.Name + "." + field.Name;
state.Add(fieldName, fieldValue);
}
}
}
currentType = currentType.BaseType;
} while(currentType != typeof(BusinessObject));
// Now we have saved the complete state of the object in the
// hashtable. We need to stack it into the state-stack.
MemoryStream buffer = new MemoryStream();
BinaryFormatter fmt = new BinaryFormatter();
fmt.Serialize(buffer, state);
_stateStack.Push(buffer.ToArray()); // Stack it as a byte-array
}
