如何更新使用EF唯一的单场 [英] How to Update only single field using EF

问题描述

这是目前基本code：

This is the current basic code :

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

我在报名表中约15场，我只是想怎么过更新的日期字段，我这里收到的对象是登记，只具有价值的日期，但目前的code更新所有的项目，我想是刚刚更新的日期字段的值我登记已经得到

I have around 15 fields in Registration table , how ever i just want to update the "Date" field , the object that i receive here is "registration" which only has value for a date , but the current code updates all the entries , what i want is to just update the "Date" field , whose value i have got in "registration"

帮助将非常AP preciated：）

Help would be much appreciated :)

推荐答案

它安装在不变状态的情况下，只有设置日期进行修改。

Attach it to the context in the Unchanged state, and only set Date as modified.

if (ModelState.IsValid)
{
    db.Registrations.Attach(registration); // attach in the Unchanged state
    db.Entry(registration).Property(r => r.Date).IsModified = true;
    // Date field is set to Modified (entity is now Modified as well)
    db.SaveChanges();
    return RedirectToAction("Index");
}

您说传入的实体只有日期填写，希望有一个标识了。 ：）

You said the incoming entity only has Date filled in, hopefully there's an Id too. :)

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