我试图preserve /保护某些字段在一个视图模型 [英] I'm trying to Preserve/Protect certain fields in a View Model

问题描述

我想实现这里找到了解决办法，但一旦我代替我的用户类 EditUserViewModel级（具有比类的用户较少的领域之一），一旦我得到这个行

I'm trying to implement the solution found here, but once I replace my "Users" class with the "EditUserViewModel" class (the one that has less fields than the Users class) and once I get to this line

db.Entry(users).State = EntityState.Modified;

在此code

    [HttpPost]
    public ActionResult Edit(EditUserViewModel users)
    {
        if (ModelState.IsValid)
        {
            db.Entry(users).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(users);
    }

我得到的错误

The entity type EditUserViewModel is not part of the model for the current context.

现在我猜这个错误，因为我的DbContext使用了类的用户，而不是EditUserViewModel类。我缺少的一个步骤或者是有没有什么办法解决这一问题？

Now I'm guessing this error is because my DBContext uses the Users class and not the EditUserViewModel class. Am I missing a step or is there any way to fix this?

推荐答案

您需要从MV中的数据合并到模型类。

You need to merge the data from your MV to your Model class.

if (ModelState.IsValid)
{
    var existingUser = db.Users.Single(p => /* query to find your user */);

    existingUser.From = user.From;
    existingUser.CC = user.CC;
    // etc.

    db.SaveChanges();

    return RedirectToAction("Index");
}

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