WPF

Since WPF has built-in invalidation of errors on property change, there is no need for raising ErrorsChanged in such a case.

Therefore, constructors of validatable WPF view models should pass false to base. It is advisable to define a base class as follows:

using Ditto.AsyncMvvm;

public abstract class ViewModelBase : AsyncValidatableBindableBase<string>
{
    protected ViewModelBase()
        : base(false)
    {
    }
}

or:

using Ditto.AsyncMvvm;

public abstract class ViewModelBase : ValidatableBindableBase<string>
{
    protected ViewModelBase()
        : base(false)
    {
    }
}