ASP.NET MVC 2 validation LINQ to SQL

Question

Currently I have a DataModel object which contains my linq to sql classes(a dmbl file). Currently I use a partial class to validate the incoming input. For example

public partial class User : IEntity
{

    public NameValueCollection CheckModel()
    {
        return GetRuleViolations();
    }

    /// <summary>
    /// Method validates incoming data, by given rules in the if statement.
    /// </summary>
    /// <returns>NameValueCollection</returns>
    private NameValueCollection GetRuleViolations()
    {
        NameValueCollection errors = new NameValueCollection();
        if (string.IsNullOrEmpty(Username))
            errors.Add("Username", "A username is required");
        // and so on
        return errors;
    }

}

Now what I want to try to do is add validation attributes to the fields. For example I want to try to add the required attribute to the field Username instead/in addtion of using the validation I currently have. My question is how can I achieve this because the dmbl file is auto generated. Or maybe it is not possible and should I use a different approach?

You will have to generate your own L2S classes. Look for T4 templates. — leppie
– leppie, Commented Mar 23, 2010 at 11:04

LukLed · Accepted Answer · 2010-03-23 12:16:01Z

2

You should read about Metadata classes. This is example blog entry about it.

Adding Required atrribute to User class will be something like:

[MetadataType(typeof(UserMetadata))]
public partial class User
{
}

public class UserMetadata
{
    [Required]
    public string Username { get; set; }
}

edited Mar 23, 2010 at 12:16

answered Mar 23, 2010 at 11:15

LukLed

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1 Comment

Rody Over a year ago

You might also find the following links interesting: weblogs.asp.net/scottgu/archive/2010/01/15/… and msdn.microsoft.com/en-us/library/ee256141%28VS.100%29.aspx DataAnnotations is the keyword in this situations. ASP.Net MVC 2 even supports client side validation for this kind of validations.

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