/// <summary>
/// Get change state by comparing old and new values.
/// </summary>
/// <param name="type">Type of values.</param>
/// <param name="oldValue">Old value.</param>
/// <param name="newValue">New value.</param>
/// <returns></returns>
public static ChangeState GetValueChangeSet(Type type, object oldValue, object newValue)
{
ChangeState state = new ChangeState();
state.ValueType = type;
state.oldValue = oldValue;
state.newValue = newValue;
state.State = System.Data.EntityState.Unchanged;
if (oldValue != newValue)
{
state.State = System.Data.EntityState.Modified;
}
bool oldIsEmpty = oldValue == null || oldValue == Activator.CreateInstance(type);
bool newIsEmpty = newValue == null || newValue == Activator.CreateInstance(type);
if (oldIsEmpty && !newIsEmpty)
{
state.State = System.Data.EntityState.Added;
}
if (newIsEmpty && !oldIsEmpty)
{
state.State = System.Data.EntityState.Deleted;
}
return(state);
}
/// <summary>
/// Get change state by comparing old and new values.
/// </summary>
/// <param name="type">Type of values.</param>
/// <param name="oldValue">Old value.</param>
/// <param name="newValue">New value.</param>
/// <returns></returns>
public static ChangeState GetValueChangeSet(Type type, object oldValue, object newValue)
{
ChangeState state = new ChangeState();
state.ValueType = type;
state.oldValue = oldValue;
state.newValue = newValue;
state.State = System.Data.EntityState.Unchanged;
if (oldValue != newValue) state.State = System.Data.EntityState.Modified;
bool oldIsEmpty = oldValue == null || oldValue == Activator.CreateInstance(type);
bool newIsEmpty = newValue == null || newValue == Activator.CreateInstance(type);
if (oldIsEmpty && !newIsEmpty) state.State = System.Data.EntityState.Added;
if (newIsEmpty && !oldIsEmpty) state.State = System.Data.EntityState.Deleted;
return state;
}
