1.优点：

1）相当于PartialView + 一个小型轻量级的Controller（注：PartialView无法包含业务逻辑）

2）适用于较为复杂业务

3）可以使用Razor语法

2.创建View Component

结构：

1）创建ViewComponents文件夹、MovieCountViewComponent.cs

using CoreModel;using CoreModelTwo.Services;using Microsoft.AspNetCore.Mvc;using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;namespace CoreModelTwo.ViewComponents{ public class MovieCountViewComponent : ViewComponent { private readonly IMovieService _movieService; //依赖注入 public MovieCountViewComponent(IMovieService movieService) { _movieService = movieService; } public async Task<IViewComponentResult> InvokeAsync() { var movies = await _movieService.GetByCinemaAsync(1); var count = movies.Count(); var movies2 = await _movieService.GetByCinemaAsync(1); count += movies2.Count(); return View(count); } }}

2）在Shared文件夹里创建文件夹Components、MovieCount和Default.cshtml

Default.cshtml：

@model int<h2>Movie Count:</h2><h2>@Model</h2>

3）使用：在页面里头加入

@await Component.InvokeAsync("MovieCount")

结果显示：

 参阅：https://v.qq.com/x/page/x0750why9sm.html

 谢谢Dave