How to allow empty strings in EF Core?

How to allow empty strings in EF Core?

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. // // Summary: // Gets or sets a value that indicates whether an empty string is allowed.

When to use isrequired method in Entity Framework?

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.

When to throw dbentityvalidationexception in EF6?

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 current project utilizng EF6, The DBEntityValidationException is not thrown when the string property is empty.

Is there validation exception for an empty string?

The [Required] annotation however, will raised a validation exception if the property is null, contains an empty string (“”), or contains only white-space characters. 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.

Is the empty string the same as the empty set?

The empty string is like empty set just a name that everybody uses to call “”. Also in formal languages strings created from an alphabet that have zero length are called the empty string. Both set and string have a special symbol for it. Empty string: ε and empty set: ∅.

When to use string or empty in VisualStudio?

No one mentioned that in VisualStudio String is color coded differently then string. Which is important for readability. Also, lower case is usually used for vars and type, not a big deal but String.Empty is a constant and not a var or type. string is synonym for System.String type, They are identical.

Can you write String.Empty in switch case?

One difference is that if you use a switch-case syntax, you can’t write case string.Empty: because it’s not a constant. You get a Compilation error : A constant value is expected Look at this link for more info: string-empty-versus-empty-quotes