问题描述

我有一个视图组件，其中包含一些嵌入到各个页面中的可重用业务逻辑.这一直运作良好.但是，我现在需要使用 ajax 刷新视图组件.

I have a viewcomponent that contains some reusable business logic that embed in various pages. This has been working fine. However, I now have a requirement to refresh the viewcomponent using ajax.

有没有办法做到这一点?根据我的阅读，这是不可能的，尽管该信息有点过时了.如果不可能，最好的选择是什么?

Is there any way to accomplish this? From what I have read, it is not possible, although that info was a bit outdated. If it is not possible, what is the best alternative?

推荐答案

在 beta7 上，现在可以直接从控制器返回 ViewComponent.检查 公告

On beta7 it is now possible to return a ViewComponent directly from a controller. Check the MVC/Razor section of the announcement

MVC 中新增的 ViewComponentResult 使得返回结果变得容易来自动作的 ViewComponent.这使您可以轻松地暴露ViewComponent 作为独立端点的逻辑.

The new ViewComponentResult in MVC makes it easy to return the result of a ViewComponent from an action. This allows you to easily expose the logic of a ViewComponent as a standalone endpoint.

所以你可以有一个像这样的简单视图组件:

So you could have a simple view component like this:

[ViewComponent(Name = "MyViewComponent")]
public class MyViewComponent : ViewComponent
{
    public IViewComponentResult Invoke()
    {
        var time = DateTime.Now.ToString("h:mm:ss");
        return Content($"The current time is {time}");
    }
}

在控制器中创建一个方法，例如:

Create a method in a controller like:

public IActionResult MyViewComponent()
{
    return ViewComponent("MyViewComponent");
}

并且比我快速而肮脏的 ajax 刷新做得更好:

And do a better job than my quick and dirty ajax refresh:

var container = $("#myComponentContainer");
var refreshComponent = function () {
    $.get("/Home/MyViewComponent", function (data) { container.html(data); });
};

$(function () { window.setInterval(refreshComponent, 1000); });

当然，在 beta7 之前，您可以创建一个视图作为@eedam 建议的解决方法，或者使用 这些答案

Of course, prior to beta7 you could create a view as the workaround suggested by @eedam or use the approach described in these answers

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