/// <summary>
/// Creates a data transfer object from a given view model.
/// The view model must use <see cref="DtoAttribute"/> and <see cref="DtoPropertyAttribute"/> for the conversion to work.
/// </summary>
/// <typeparam name="TDto">The data transfer object type to create.</typeparam>
/// <param name="viewModel">The view model to convert.</param>
/// <returns>The converted data transfer object.</returns>
public static TDto ToDto <TDto>(this ViewModel viewModel)
where TDto : class
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
var dtoAttr = DtoAttribute.GetDtoAttribute(viewModel.GetType());
if (dtoAttr == null)
{
throw new InvalidOperationException("The given view data transfer object has no DtoAttribute defined.");
}
if (!dtoAttr.Type.IsAssignableFrom(typeof(TDto)))
{
throw new InvalidCastException($"Cannot cast the data transfer object attribute type {dtoAttr.Type.Name} into the desired type {typeof(TDto).Name}.");
}
TDto result = (TDto)Activator.CreateInstance(dtoAttr.Type) !;
foreach (var propertyInfo in viewModel.GetType().GetProperties())
{
var dtoPropertyAttr = DtoPropertyAttribute.GetDtoPropertyAttribute(propertyInfo);
if (dtoPropertyAttr == null)
{
continue;
}
var dtoPropertyInfo = dtoAttr.Type.GetProperty(dtoPropertyAttr.PropertyName);
if (dtoPropertyInfo == null)
{
throw new InvalidOperationException($"There is no property called {dtoPropertyAttr.PropertyName} for the data transfer object type {dtoAttr.Type.Name}.");
}
dtoPropertyInfo.SetValue(result, propertyInfo.GetValue(viewModel, null), null);
}
return(result);
}
/// <summary>
/// Creates a view model from a given data transfer object.
/// The view model must use <see cref="DtoAttribute"/> and <see cref="DtoPropertyAttribute"/> for the conversion to work.
/// </summary>
/// <typeparam name="TViewModel">The view model type to create.</typeparam>
/// <param name="dto">The data transfer object to convert.</param>
/// <returns>The converted view model.</returns>
public static TViewModel ToViewModel <TViewModel>(this object dto)
where TViewModel : ViewModel
{
if (dto == null)
{
throw new ArgumentNullException(nameof(dto));
}
var dtoAttr = DtoAttribute.GetDtoAttribute(typeof(TViewModel));
if (dtoAttr == null)
{
throw new InvalidOperationException("The given view model has no DtoAttribute defined.");
}
if (!dtoAttr.Type.IsAssignableFrom(dto.GetType()))
{
throw new InvalidCastException($"Cannot cast the data transfer object attribute type {dtoAttr.Type.Name} into the given type {dto.GetType().Name}.");
}
TViewModel result = (TViewModel)Activator.CreateInstance(typeof(TViewModel)) !;
foreach (var propertyInfo in typeof(TViewModel).GetProperties())
{
var dtoPropertyAttr = DtoPropertyAttribute.GetDtoPropertyAttribute(propertyInfo);
if (dtoPropertyAttr == null)
{
continue;
}
var dtoPropertyInfo = dtoAttr.Type.GetProperty(dtoPropertyAttr.PropertyName);
if (dtoPropertyInfo == null)
{
throw new InvalidOperationException($"There is no property called {dtoPropertyAttr.PropertyName} for the data transfer object type {dtoAttr.Type.Name}.");
}
propertyInfo.SetValue(result, dtoPropertyInfo.GetValue(dto, null), null);
}
return(result);
}
private static TViewModel ToViewModel <TViewModel>(object dto, List <object> visitedDtos)
where TViewModel : ViewModel
{
if (dto == null)
{
throw new ArgumentNullException(nameof(dto));
}
if (visitedDtos.Contains(dto))
{
throw new NotSupportedException("Cyclic relationships are not supported!");
}
visitedDtos.Add(dto);
var dtoAttrs = DtoAttribute.GetDtoAttributes(typeof(TViewModel));
if (!dtoAttrs.Any())
{
throw new InvalidOperationException("The given view model has no DtoAttribute defined.");
}
var dtoAttr = dtoAttrs.FirstOrDefault(attr => attr.Type.IsAssignableFrom(dto.GetType()));
if (dtoAttr == null)
{
throw new InvalidCastException($"There is no DtoAttribute assignable to the given type {dto.GetType().Name}.");
}
TViewModel result = (TViewModel)Activator.CreateInstance(typeof(TViewModel)) !;
foreach (var propertyInfo in typeof(TViewModel).GetProperties())
{
var dtoPropertyAttrs = DtoPropertyAttribute.GetDtoPropertyAttributes(propertyInfo);
if (!dtoPropertyAttrs.Any())
{
continue;
}
var dtoPropertyAttr = dtoPropertyAttrs.FirstOrDefault(attr => attr.Type == null || attr.Type.IsAssignableFrom(dto.GetType()));
if (dtoPropertyAttr == null)
{
continue;
}
var dtoPropertyInfo = dtoAttr.Type.GetProperty(dtoPropertyAttr.PropertyName);
if (dtoPropertyInfo == null)
{
throw new InvalidOperationException($"There is no property called {dtoPropertyAttr.PropertyName} for the data transfer object type {dtoAttr.Type.Name}.");
}
object?valueToConvert = dtoPropertyInfo.GetValue(dto, null);
object?valueToSet;
if (typeof(ViewModel).IsAssignableFrom(propertyInfo.PropertyType))
{
if (valueToConvert == null)
{
continue;
}
MethodInfo genericToViewModel = _internalToViewModelInfo.MakeGenericMethod(propertyInfo.PropertyType);
valueToSet = genericToViewModel.Invoke(null, new[] { valueToConvert, visitedDtos });
}
else if (HelperExtensions.IsTypeIList(dtoPropertyInfo.PropertyType) && HelperExtensions.IsTypeObservableViewModelCollection(propertyInfo.PropertyType))
{
if (valueToConvert == null)
{
continue;
}
var collection = Activator.CreateInstance(propertyInfo.PropertyType, new[] { result }) !;
MethodInfo genericToViewModel = _internalToViewModelInfo.MakeGenericMethod(propertyInfo.PropertyType.GenericTypeArguments.First());
foreach (var item in (IEnumerable)valueToConvert)
{
((IList)collection).Add(genericToViewModel.Invoke(null, new[] { item, visitedDtos }));
}
valueToSet = collection;
}
else
{
valueToSet = valueToConvert;
}
propertyInfo.SetValue(result, valueToSet, null);
}
return(result);
}