如何手动验证带有属性的模型? [英] How to manually validate a model with attributes?

问题描述

我有一个名为User的类和一个属性Name

I have a class called User and a property Name

public class User
{
    [Required]
    public string Name { get; set; }
}

我想验证它，如果有任何错误，请添加到控制器的ModelState或实例化另一个模型状态...

And I want to validate it, and if there are any errors add to the controller's ModelState or instantiate another modelstate...

[HttpPost]
public ActionResult NewUser(UserViewModel userVM)
{
    User u = new User();
    u.Name = null;

    /* something */

    // assume userVM is valid
    // I want the following to be false because `user.Name` is null
    if (ModelState.IsValid)
    {
        TempData["NewUserCreated"] = "New user created sucessfully";

        return RedirectToAction("Index");
    }

    return View();
}

该属性适用于UserViewModel，但是我想知道如何在不将其发布到动作的情况下验证该类.

The attributes works for UserViewModel, but I want to know how to validate a class without posting it to an action.

我该怎么做?

推荐答案

您可以使用 Validator 完成此任务.

You can use Validator to accomplish this.

var context = new ValidationContext(u, serviceProvider: null, items: null);
var validationResults = new List<ValidationResult>();

bool isValid = Validator.TryValidateObject(u, context, validationResults, true);

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