protected override Task <IDictionary <string, IEnumerable> > ValidateInternalAsync(string propertyName, CancellationToken token)
{
if (!MemberNameEqual(propertyName, () => model => model.Login))
{
return(EmptyResult);
}
// To simulate the long-term operation.
return(Task <IDictionary <string, IEnumerable> > .Factory.StartNew(() =>
{
ToolkitExtensions.Sleep(500);
if (token.IsCancellationRequested)
{
return null;
}
if (_userRepository.GetUsers().Any(model => model != Instance && model.Login == Instance.Login))
{
return new Dictionary <string, IEnumerable>
{
{
propertyName,
$"The user with login {Instance.Login}, already exists."
}
}
}
;
return null;
}, token));
}
/// <summary>
/// Updates information about errors in the specified property.
/// </summary>
/// <param name="propertyName">The specified property name.</param>
/// <returns>
/// The result of validation.
/// </returns>
protected override Task <IDictionary <string, IEnumerable> > ValidateInternalAsync(string propertyName)
{
if (!PropertyNameEqual(propertyName, model => model.Login))
{
return(EmptyResult);
}
// To simulate the long-term operation.
return(Task <IDictionary <string, IEnumerable> > .Factory.StartNew(() =>
{
ToolkitExtensions.Sleep(500);
if (_userRepository.GetUsers().Any(model => model != Instance && model.Login == Instance.Login))
{
return new Dictionary <string, IEnumerable>
{
{
propertyName,
string.Format("The user with login {0}, already exists.", Instance.Login)
}
}
}
;
return null;
}));
}