Allowing just white space in 'Required' data annotation

Question

I am using the [Required] data annotation on a string. This works just as intended, however it deems an input only consisting of white space to be invalid.

Is there any way to change this?

Answer 1

There is an AllowEmptyStrings property on the RequiredAttribute. See if that helps.

https://learn.microsoft.com/en-us/dotnet/api/system.componentmodel.dataannotations.requiredattribute.allowemptystrings

Answer 2

According to MSDN you can use AllowEmptyStrings:

 [Required(AllowEmptyStrings = false)]
 public string CompanyName { get; set; }

Answer 3

Although [Required(AllowEmptyStrings = true)] does allow whitespace, it also allows actual empty strings.

With [StringthLength(...)], you can permit whitespace but still forbid empty strings:

[StringLength(int.MaxValue, MinimumLength = 1)]
public string CompanyName { get; set; }