直接从Web API核心端点返回base64编码的图像 [英] return base64 encoded images directly from a web api core endpoint
本文介绍了直接从Web API核心端点返回base64编码的图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经看到了这些答案:
I have seen these SO answers:
- Return an image from asp.net web api core as IActionResult
- Response.Body.WriteAsync base64 string not working
但是这些要么直接提供物理文件，要么从字节数组提供.
but these either serve physical files directly or serve from a byte array.
请为我们的Web API端点提供一种直接从data:image/png; base64，(我们的base64字符串)返回内容类型:image/png
Please is there a way for our Web API Endpoint to return content-type: image/png directly from data:image/png;base64,(our base64 string)
推荐答案
从文件夹中读取文件非常简单.诀窍是使用 ASP.NET Core 中的 IHostingEnvironment 来获取当前的Web根路径.
It is quite straight forward to read a file from a folder. The trick is to use IHostingEnvironment in ASP.NET Core to get the current web root path.
using System;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
namespace DemoWebApiCore.Controllers
{
[Route("api/[controller]")]
public class FilesController : Controller
{
private readonly IHostingEnvironment _hostingEnvironment;
public FilesController(IHostingEnvironment hostingEnvironment)
{
_hostingEnvironment = hostingEnvironment;
}
// GET api/files/sample.png
[HttpGet("{fileName}")]
public string Get(string fileName)
{
string path = _hostingEnvironment.WebRootPath + "/images/" + fileName;
byte[] b = System.IO.File.ReadAllBytes(path);
return "data:image/png;base64," + Convert.ToBase64String(b);
}
}
}
用法
HomeController.cs
using Microsoft.AspNetCore.Mvc;
namespace DemoWebApiCore.Controllers
{
public class HomeController : Controller
{
// GET: /<controller>/
public IActionResult Index()
{
return View();
}
}
}
Index.cshtml
<html>
<body>
<img id="sample-img" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript">
$(function () {
var url = "/api/files/sample.png";
$.get(url, function (data) {
console.log(data);
$("#sample-img").attr('src', data);
});
})
</script>
</body>
</html>
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