实体框架更新 - 上下文当前没有跟踪实体 [英] Entity Framework Update - The context is not currently tracking the entity

问题描述

我正在尝试更新一个实体，但是我收到以下错误：

I am trying to update an entity but I am getting the following error:

上下文当前没有跟踪实体。 / p>

The context is not currently tracking the entity.

我的数据库表由以下字段组成：

My DB table consists of the following fields:

fixturedate，leagueID（FK），A组（FK），B组（FK）。

fixturedate, leagueID (FK), Team A (FK), Team B (FK).

我的代码如下：

public void UpdateFixture(Fixture validFixture)
{
    Fixture fixture = new Fixture();
    fixture = entities.Fixtures.Where(f => f.fixtureId == validFixture.fixtureId).FirstOrDefault();

    League league = new League();
    league.LeagueId = validFixture.leagueId;
    fixture.League = leagueActions.GetLeague(league);

    fixture.Team1 = teamActions.GetTeam(validFixture.teamA);
    fixture.Team2 = teamActions.GetTeam(validFixture.teamB);

    entities.UpdateObject(validFixture);
    entities.SaveChanges();
}

当我做 entities.AttachTo（Fixtures ，validFixture）; 我收到以下错误：

When I do entities.AttachTo("Fixtures", validFixture); I get the following error:

上下文已经跟踪具有相同的不同实体资源Uri。

The context is already tracking a different entity with the same resource Uri.

我需要做些什么来更新灯具实体？

What do I need to do to update the fixture entity?

推荐答案

为什么没有跟踪validFixture并没有从您的代码中清除，但是您正在选择与validFixture实例具有相同ID的Fixture实体，这意味着它正在跟踪该实体通过fixture实例。

Why the validFixture is not tracked is not clear from your code, however you are selecting a Fixture entity with the same ID as the validFixture instance, which means it is now tracking that entity via the "fixture" instance.

基本上这意味着您可以通过fixture实例直接更新实体。尝试通过调用UpdateObject方法删除该行。

Basically this means that you can update the entity via the "fixture" instance directly. Try just removing the line with the call to the UpdateObject method.

这篇关于实体框架更新 - 上下文当前没有跟踪实体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！