.net core 使用ViewComponent

.net core 中的局部視圖組件是ViewComponent，可以用於建制重覆使用公共功能組件

一、新建一個類DemoViewComponent(必須以ViewComponent結尾)且繼承ViewComponent

using Microsoft.AspNetCore.Mvc;
using NetCoreApiDemo.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace NetCorePortal.Components
{
    public class DemoViewComponent : ViewComponent
    {
        public async Task<IViewComponentResult> InvokeAsync()
        {
            List<tbl_page> pageList = new List<tbl_page>();
            for (int i = 0; i < 10; i++)
            {
                pageList.Add(new tbl_page()
                {
                    page_no = i.ToString(),
                    page_name = i.ToString()
                });
            }
            return View(pageList);//此處沒有返回ViewName 對應的視圖文件是Default.cshtml
            //return View("D", pageList);//此處返回的ViewName 是“D” 對應的視圖文件是D.cshtml
        }
    }
}

二、在View/Share目錄下建立Components目錄，併在此目錄下建立Demo目錄及對應Default.cshtml文件  

@model IEnumerable<NetCoreApiDemo.Model.tbl_page>
<h1>Demo IViewComponentResult</h1>
<table>
    <tr>
        <th>page_no</th>
        <th>page_name</th>
    </tr>
    @foreach (var item in Model)
    {
        <tr>
            <td>@item.page_no</td>
            <td>@item.page_name</td>
        </tr>
    }
</table>