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
（初识MVC Core）七、复用的View：View Component
原文地址：https://www.cnblogs.com/dzw159/p/10591514.html