CODEWITHSUNDEEP
asp.net-mvcentity-frameworkentity-framework-5
The Vanilla Thrilla
The Vanilla Thrilla

Reputation: 2005

How Can I prevent a primary key that I have to display to the user from being updated?

I have a CompanyCode that is readonly and has to be displayed to the user. I have no say in preventing this from being the primary key. How can I prevent the user from updating this field at all on the server-side?

I've tried the following:

company.Property(s => s.CompanyCode).IsModified = false;

However, this throws an error that the key field can't be modified. Is there an easy way to prevent the user from changing the key field or telling Entity Framework not to attempt to update this field?

Upvotes: 0

Views: 617

Answers (2)

Chris Pratt
Chris Pratt

Reputation: 239360

You should always, always, always, update the entity pulled fresh from the database with the posted values, rather than saving the posted version directly to the database. Therefore, all you need to do is pass the id in the URL:

public ActionResult Edit(int id, CompanyViewModel model)
{
    var company = db.Companies.Find(id);
    if (company == null)
    {
        return new HttpNotFoundResult();
    }

    if (ModelState.IsValid)
    {
        // map `model` properties to `company` properties
        db.Entry(company).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(model);
}

Upvotes: 2

Mike Marks
Mike Marks

Reputation: 10139

If I'm understanding you correctly, and you must show this CompanyCode on the UI, just display the company code using @Html.DisplayFor(model => model.CompanyCode) on your View, instead of EditorFor which renders a text box in which case, if you render a textbox, this value would be able to be updated. Does this make sense

EDIT

If you need this to post back to the server, make it @Html.EditorFor(model => model.CompanyCode) and simply disable this control via JavaScript.

Upvotes: 0

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