/// <summary>
/// Is called by the indexer to collect all errors and not only the one for a special field.
/// </summary>
/// <remarks>
/// Because <see cref="HasErrors" /> depends on the <see cref="Errors" /> dictionary this
/// ensures that controls like buttons can switch their state accordingly.
/// </remarks>
private void CollectErrors()
{
Errors.Clear();
PropertyInfos.ForEach(
prop =>
{
var currentValue = prop.GetValue(this);
var requiredAttr = prop.GetCustomAttribute <RequiredAttribute>();
var maxLenAttr = prop.GetCustomAttribute <MaxLengthAttribute>();
if (requiredAttr != null)
{
if (string.IsNullOrEmpty(currentValue?.ToString() ?? string.Empty))
{
Errors.Add(prop.Name, requiredAttr.ErrorMessage);
}
}
if (maxLenAttr != null)
{
if ((currentValue?.ToString() ?? string.Empty).Length > maxLenAttr.Length)
{
Errors.Add(prop.Name, maxLenAttr.ErrorMessage);
}
}
// TODO further attributes
});
// we have to this because the Dictionary does not implement INotifyPropertyChanged
OnPropertyChanged(nameof(HasErrors));
OnPropertyChanged(nameof(IsOk));
// commands do not recognize property changes automatically
OnErrorsCollected();
}
/// <summary>
/// Is called by the indexer to collect all errors and not only the one for a special field.
/// </summary>
/// <remarks>
/// Because <see cref="HasErrors" /> depends on the <see cref="Errors" /> dictionary this
/// ensures that controls like buttons can switch their state accordingly.
/// </remarks>
private void CollectErrors()
{
Errors.Clear();
PropertyInfos.ForEach(
prop =>
{
//Validate generically
var errors = new List <string>();
var isValid = TryValidateProperty(prop, errors);
if (!isValid)
{
Errors.Add(prop.Name, errors.FirstOrDefault());
}
});
// we have to this because the Dictionary does not implement INotifyPropertyChanged
OnPropertyChanged(nameof(HasErrors));
OnPropertyChanged(nameof(IsOk));
// commands do not recognize property changes automatically
OnErrorsCollected();
}