如何在不使用View的情况下删除MVC中的记录?

时间:2015-07-24 16:08:56

标签: javascript c# asp.net-mvc

通常我在索引视图中添加以下内容:

@Html.ActionLink(" ", "Delete", new { id = item.UserId }, new { onclick = "return confirm('Are you sure you want to delete this user?');", @class = "delete-button" })

这允许我删除内联在桌面上的项目,而无需离开我的列表。我需要做的就是通过javascript确认删除。

我的行动如下:

public ActionResult Delete(int id)
{
    User user = db.Users.Find(id);
    if (user == null)
    {
        return HttpNotFound();
    }
    else
    {
        db.Users.Remove(user);
        db.SaveChanges();
        return RedirectToAction("Index");
    }
}

我现在正在尝试同样的事情,但是我的网络服务链接将处理数据库上的删除。

唯一的区别在于控制器现在看起来像这样:

private async Task<ActionResult> Delete(int id)
{
    string url = String.Format("api/user/{0}", id);

    using (HttpClient client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:49474/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage response = await client.DeleteAsync(url);

        return RedirectToAction("Index");
    }
}

为了彻底,这是删除记录的Web服务代码:

public HttpResponseMessage Delete(int id)
{
    try
    {
        var existing = db.Users.Find(id);

        if (existing != null)
        {
            db.Users.Remove(existing);
            db.SaveChanges();

            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);

            return response;
        }
        else
        {
            throw new ArgumentNullException("Object ID not found");
        }

    }
    catch (Exception ex)
    {
        return ReportError(ex, "DELETE USER");
    }
}

这给了我javascript确认但是数据库上没有发生删除,我得到一个错误屏幕,显示没有视图存在。

调试后,我发现上面的函数甚至都没有请求。我觉得我需要在控制器中添加一些内容,但我不确定是什么。

1 个答案:

答案 0 :(得分:0)

只需将控制器的操作更改为公开:

public async Task<ActionResult> Delete(int id)
{
    string url = String.Format("api/user/{0}", id);

    using (HttpClient client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:49474/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage response = await client.DeleteAsync(url);

        return RedirectToAction("Index");
    }
}