/// <summary>
/// Returns the data instance that should be edited based on the given edit state and data
/// type.
/// </summary>
private static Data.IData GetEditedData(IQueryableEntity entity,
DataEditState editState, Type dataType)
{
var accessor = new DataAccessor(dataType);
switch (editState) {
case DataEditState.Current:
return entity.Current(accessor);
case DataEditState.Previous:
return entity.Previous(accessor);
}
throw new InvalidOperationException("Unknown edit state");
}
public static T Previous <T>(this IQueryableEntity entity) where T : Data.IVersioned
{
return((T)entity.Previous(DataMap <T> .Accessor));
}
/// <summary>
/// Returns the previous data value for the given data type.
/// </summary>
/// <typeparam name="TData">The type of data to retrieve. It has to be one of the generic
/// parameters for this type; if it is not, then an exception is thrown.</typeparam>
/// <returns>The current value for the given data type.</returns>
public TData Previous <TData>() where TData : Data.IVersioned
{
VerifyRequest <TData>();
return(_provider.Previous <TData>());
}