EF 6 IsRequired() allowing empty strings

Question

In past projects with versions of EF5 and EF4, the IsRequired() fluent API method would thrown a DbEntityValidationException if the property was null or an empty string. In my

Answer 1

You may be confusing the StringColumnConfiguration.IsRequired Method and RequiredAttribute.

.IsRequired() marks that column in the database is NOT NULL. The [Required] annotation however, will raised a validation exception if the property is null, contains an empty string (""), or contains only white-space characters.

Answer 2

EF Core 2.1 here - looks like marking a property as required using [Required] and saving it to the DB with empty string value, let's it go through... very strange.

Documentation states the following:

//
// Summary:
//     Gets or sets a value that indicates whether an empty string is allowed.
//
// Returns:
//     true if an empty string is allowed; otherwise, false. The default value is false.
public bool AllowEmptyStrings { get; set; }

Answer 3

These days you can still use [Required] attribute and have configurable AllowEmptyStrings

[Required(AllowEmptyStrings = false)]

False is default