using System;using System.IO;using System.Threading.Tasks;using Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Mvc;using Microsoft.Extensions.Caching.Memory;namespace MyPorject.MVC.ViewComponents{ ???public class ImgToBase64ViewComponent : ViewComponent ???{ ???????private readonly IHostingEnvironment _hostingEnvironment; ???????private readonly IMemoryCache _memoryCache; ???????public ImgToBase64ViewComponent(IHostingEnvironment hostingEnvironment, IMemoryCache memoryCache) ???????{ ???????????_hostingEnvironment = hostingEnvironment; ???????????_memoryCache = memoryCache; ???????} ???????public async Task InvokeAsync(string src) ???????{ ???????????string cacheKey = src; ???????????string result = await _memoryCache.GetOrCreateAsync(cacheKey, async entry => ?????????????{ ?????????????????string webRootPath = _hostingEnvironment.WebRootPath; ?????????????????string path = webRootPath + @"\" + src.TrimStart(‘~‘).TrimStart(‘/‘).Replace(@"/", @"\").ToString(); ?????????????????try ?????????????????{ ?????????????????????using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read)) ?????????????????????{ ?????????????????????????var byteArray = new byte[fs.Length]; ?????????????????????????await fs.ReadAsync(byteArray, 0, byteArray.Length); ?????????????????????????result = "data:image/jpeg;base64," + Convert.ToBase64String(byteArray); ?????????????????????} ?????????????????} ?????????????????catch (Exception ex) ?????????????????{ ?????????????????????result = ex.Message; ?????????????????} ?????????????????return await Task.FromResult(result); ?????????????}); ???????????return View("", result); ???????} ???}}添加default.cshtml
使用方法：
将原来src中改成Component.InvokeAsync 就可以使用了
效果如图：
.net core使用ViewComponent将页面图片转码成base64
原文地址：https://www.cnblogs.com/WNpursue/p/10447208.html