ASP.NET MVC 2验证的LINQ to SQL

问题描述

目前我有一个包含我的LINQ to SQL类（一个dmbl文件）到DataModel对象。目前我使用的部分类来验证传入输入。例如：

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;
    }

}

现在我想尝试做的是添加验证属性的字段。例如，我想尝试所需的属性添加到该领域，而不是用户名/用我目前拥有的验证addtion。我的问题是如何能够做到这一点，因为生成dmbl文件自动。或者，也许这是不可能的，我应该使用不同的方法？

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?

推荐答案

您应该阅读有关的元数据类。这是例子博客条目一下吧。

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

添加要求 atrribute到用户类将是这样的：

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; }
}

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