private static void AddTagUsingAttributeValidation(PhotographersContext context)
{
/* Using TagTransform with TagAttribute Validations.
* To test this method =>
* Uncomment (Enable) the [Tag] annotation in Tag.cs &
* Comment (Disdable) the respective anotated lines of code in Tag.cs */
Console.WriteLine("Solution to Problem 8:\n" +
"* Using TagTransform with attribute validation.");
string tagName = String.Empty;
while (true)
{
Console.Write("Enter Tag Name: ");
tagName = Console.ReadLine();
if (!string.IsNullOrWhiteSpace(tagName))
{
break;
}
Console.Write("Tag Name cannot be empty. ");
}
Tag tag = new Tag()
{
Name = tagName
};
context.Tags.Add(tag);
try
{
context.SaveChanges();
Console.WriteLine($"{tag.Name} was added to the database");
}
catch (DbEntityValidationException e)
{
tag.Name = TagTransformer.Transform(tag.Name);
if (context.Tags.FirstOrDefault(t => t.Name == tag.Name) == null)
{
context.SaveChanges();
Console.WriteLine($"{tag.Name} was added to the database");
}
else
{
Console.WriteLine($"{tag.Name} already exists in the database");
}
}
}
static void Main(string[] args)
{
Console.WriteLine("Initialiazing database [Photographers.CodeFirst]");
PhotographersContext context = new PhotographersContext();
context.Database.Initialize(true);
Console.WriteLine("\nSolutions to Problems:\n" +
" 5. Photographers\n" +
" 6. Albums\n" +
" 7. Tags\n" +
" 8. *Tag Attribute\n" +
" 9. Shared Albums\n" +
"10.**Photographer Roles\n" +
"\nRollback migrations to see previous versions of the database.\n");
Console.WriteLine("*************************************************************");
AddTagUsingTagTransform(context); // Problem 8 TagTransform in the Setter
//AddTagUsingAttributeValidation(context); // Problem 8 TagTransform with Attribute Validation
}
private static void AddTagUsingTagTransform(PhotographersContext context)
{
/* Using TagTransform in the Setter, no atttibute validations.
* To test this method =>
* Comment (Disable) the [Tag] annotation in Tag.cs &
* Uncomment (Enable) the respective anotated lines of code in Tag.cs */
Console.WriteLine("Solution to Problem 8:\n" +
"* Using TagTransform in the setter, no atttibute validation.\n" +
"* To test TagTransform with attribute validation, follow the comments.");
string tagName = String.Empty;
while (true)
{
Console.Write("Enter Tag Name: ");
tagName = Console.ReadLine();
if (!string.IsNullOrWhiteSpace(tagName))
{
break;
}
Console.Write("Tag Name cannot be empty. ");
}
Tag tag = new Tag()
{
Name = tagName
}; // a valid tag is set in the setter
if (context.Tags.FirstOrDefault(t => t.Name == tag.Name) == null)
{
context.Tags.Add(tag);
context.SaveChanges();
Console.WriteLine($"{tag.Name} was added to the database");
}
else
{
Console.WriteLine($"{tag.Name} already exists in the database");
}
}
