从 Asp.Net Core WebAPI 返回 jpeg 图像 [英] Return jpeg image from Asp.Net Core WebAPI

问题描述

使用asp.net core web api，我想让我的控制器操作方法返回一个jpeg 图像流.
在我当前的实现中，浏览器仅显示一个 json 字符串.我的期望是在浏览器中看到图像.

Using asp.net core web api, I want to have my controller action method to return an jpeg image stream.
In my current implementation, browser displays only a json string. My expectation is to see the image in the browser.

在使用 chrome 开发者工具调试时，我发现内容类型仍然是

While debugging using chrome developer tools I found that the content type is still

Content-Type:application/json;字符集=utf-8

在响应头中返回，即使在我的代码中我手动将内容类型设置为image/jpeg".

returned in the response header, even though in my code I manually set the content type to "image/jpeg".

寻找解决方案我的Web API如下

Looking for a solution My Web API is as below

[HttpGet]
public async Task<HttpResponseMessage> Get()
{
    var image = System.IO.File.OpenRead("C:\test
andom_image.jpeg");
    var stream = new MemoryStream();

    image.CopyTo(stream);
    stream.Position = 0;            
    result.Content = new StreamContent(image);
    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
    result.Content.Headers.ContentDisposition.FileName = "random_image.jpeg";
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
    result.Content.Headers.ContentLength = stream.Length;

    return result;
}

推荐答案

清理方案使用FilestreamResult！！

[HttpGet]
public IActionResult Get()
{
    var image = System.IO.File.OpenRead("C:\test\random_image.jpeg");
    return File(image, "image/jpeg");
}

说明:

在 ASP.NET Core 中，您必须使用控制器内部的内置 File() 方法.这将允许您手动设置内容类型.

In ASP.NET Core you have to use the built-in File() method inside the Controller. This will allow you to manually set the content type.

不要创建和返回 HttpResponseMessage，就像你在 ASP.NET Web API 2 中习惯使用的那样.它什么也不做，甚至不抛出错误！！

Don't create and return HttpResponseMessage, like you were used to using in ASP.NET Web API 2. It doesn't do anything, not even throwing errors!!

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