在MVC 2中处理和验证Post数据的现代方法

我个人不喜欢使用域模型类作为我的视图模型。我发现它会导致验证、格式化方面的问题,并且通常感觉是错误的。事实上,我不会使用 DateTime 我的视图模型上的属性(我将在控制器中将其格式化为字符串)。

我将使用两个单独的视图模型,每个模型都具有验证属性,作为主视图模型的属性公开:

注意:我留下了如何将已发布的视图模型与主视图模型结合起来作为练习,因为有几种方法可以接近它。

public class ActionAViewModel
{
    [Required(ErrorMessage="Please enter your name")]
    public string Name { get; set; }
}

public class ActionBViewModel
{
    [Required(ErrorMessage="Please enter your date")]
    // You could use a regex or custom attribute to do date validation,
    // allowing you to have a custom error message for badly formatted
    // dates
    public string Date { get; set; }
}

public class PageViewModel
{
    public ActionAViewModel ActionA { get; set; }
    public ActionBViewModel ActionB { get; set; }
}

public class PageController
{
    public ActionResult Index()
    {
        var viewModel = new PageViewModel
        {
            ActionA = new ActionAViewModel { Name = "Test" }
            ActionB = new ActionBViewModel { Date = DateTime.Today.ToString(); }
        };

        return View(viewModel);
    }

    // The [Bind] prefix is there for when you use 
    // <%= Html.TextBoxFor(x => x.ActionA.Name) %>
    public ActionResult ActionA(
        [Bind(Prefix="ActionA")] ActionAViewModel viewModel)
    {
        if (ModelState.IsValid)
        {
            // Load model, update the Name, and commit the change
        }
        else
        {
            // Display Index with viewModel
            // and default ActionBViewModel
        }
    }

    public ActionResult ActionB(
        [Bind(Prefix="ActionB")] ActionBViewModel viewModel)
    {
        if (ModelState.IsValid)
        {
            // Load model, update the Date, and commit the change
        }
        else
        {
            // Display Index with viewModel
            // and default ActionAViewModel
        }
    }
}

处理发布数据和添加验证的一种可能方法是使用自定义模型绑定器。 以下是我最近用于向表单后数据添加自定义验证的小示例:

public class Customer
{
    public string Name { get; set; }
    public DateTime Date { get; set; }
}


public class PageController : Controller
{
    [HttpPost]
    public ActionResult ActionA(Customer customer)
    {
        if(ModelState.IsValid) {
        //do something with the customer
        }
    }

    [HttpPost]
    public ActionResult ActionB(Customer customer)
    {
       if(ModelState.IsValid) { 
       //do something with the customer
       }
    }
}

CustomerModelBinder将是这样的:

    public class CustomerModelBinder : DefaultModelBinder
{
    protected override void BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, System.ComponentModel.PropertyDescriptor propertyDescriptor)
    {
        if (propertyDescriptor.Name == "Name") //or date or whatever else you want
        {


            //Access your Name property with valueprovider and do some magic before you bind it to the model.
            //To add validation errors do (simple stuff)
            if(string.IsNullOrEmpty(bindingContext.ValueProvider.GetValue("Name").AttemptedValue))
                bindingContext.ModelState.AddModelError("Name", "Please enter a valid name");

            //Any complex validation
        }
        else
        {
            //call the usual binder otherwise. I noticed that in this way you can use DataAnnotations as well.
            base.BindProperty(controllerContext, bindingContext, propertyDescriptor); 
        }
    }

在global.asax中

ModelBinders.Binders.Add(typeof(Customer), new CustomerModelBinder());

如果您不想在调用actionb时绑定name属性(just date),那么只需再创建一个自定义模型绑定器,在“if”语句中,put返回空值、已经存在的值或您想要的任何值。然后在控制器中输入:

[HttpPost]
public ActionResult([ModelBinder(typeof(CustomerAModelBinder))] Customer customer)

[HttpPost]
public ActionResult([ModelBinder(typeof(CustomerBModelBinder))] Customer customer)

其中,customerModelBinder将仅绑定名称,customerModelBinder将仅绑定日期。

这是我发现的验证模型绑定的最简单的方法,并且我在复杂的视图模型中获得了一些非常酷的结果。我敢打赌我错过了一些事情,也许一个更专业的人能回答。 希望我答对了你的问题……:)