/// <summary>
/// Reverts the value of a property
/// </summary>
public void RevertPropertyValue(string property)
{
if (!DiscartableChangesControl)
{
throw new ApplicationException("Discartable Changes Control is not active.");
}
else if (!this.IsDirty())
{
throw new ApplicationException("The data is not dirty.");
}
else
{
ValueChangedDescriptorCollection diferences = GetChanges();
if (!diferences.Contains(property))
{
throw new ApplicationException("The property is not changed.");
}
else
{
object originalValue = diferences[property].OriginalValue;
SetData(property, originalValue);
if (diferences.Count == 1)
{
backupDiscardChanges = null;
}
}
}
}
/// <summary>
/// Returns the diferences between current and backupData.
/// </summary>
public ValueChangedDescriptorCollection GetDifferences(object backupData)
{
Hashtable backup = (Hashtable)backupData;
ValueChangedDescriptorCollection changes = new ValueChangedDescriptorCollection();
foreach (string key in data.Keys)
{
if (!backup.ContainsKey(key))
{
changes.Add(key, null, data[key]);
}
else if (!backup[key].Equals(data[key]))
{
changes.Add(key, backup[key], data[key]);
}
}
foreach (string key in backup.Keys)
{
if (!data.ContainsKey(key))
{
changes.Add(key, backup[key], null);
}
}
return(changes);
}
/// <summary>
/// Gets the changes respect the original version.
/// </summary>
/// <remarks>
/// To use this, DiscartableChangesControl has to be true.
/// </remarks>
public ValueChangedDescriptorCollection GetChanges()
{
if (!DiscartableChangesControl)
{
throw new ApplicationException("Discartable Changes Control is not active.");
}
else if (backupDiscardChanges == null)
{
return(ValueChangedDescriptorCollection.CreateEmpty());
}
else
{
return(GetDifferences(backupDiscardChanges));
}
}
