MVC Dataannotation validation rule for a collection?

Is there a dataannotation validate rule for a collection based property?

I have the following

  <DisplayName("Category")>
  <Range(1, Integer.MaxValue, ErrorMessage:="Please select a category")>
  Property CategoryId As Integer

  <DisplayName("Technical Services")>
  Property TechnicalServices As List(Of Integer)

I'm looking for a validator that i can add to the TechnicalServices property to set a minimum for the collection size.

Answers


I think something like this might help:

public class MinimumCollectionSizeAttribute : ValidationAttribute
{
    private int _minSize;
    public MinimumCollectionSizeAttribute(int minSize)
    {
        _minSize = minSize;
    }

    public override bool IsValid(object value)
    {
        if (value == null) return true;
        var list = value as ICollection;

        if (list == null) return true;

        return list.Count >= _minSize;
    }    
}

There's room for improvement, but that's a working start.


Need Your Help

linq.js groupby with Json

javascript jquery jquery-plugins linq.js

This is my Json Object in simplified form.

True Full Screen JFrame/Swing Application in Mac OSX

java osx swing jframe fullscreen

I'm working on application and I'm making the GUI with Swing. I would like my application to be fullscreen. I can easily set the size of the window however I have not been able to make the applic...

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.