HttpResponseMessage 不返回 ByteArrayContent - ASP.NET Core

ASP.NET Core 是一个跨平台的开源框架，用于构建高性能、可扩展的 Web 应用程序。在处理 HTTP 请求和响应时，我们经常需要使用 HttpResponseMessage 类来发送响应给客户端。然而，有时我们可能想要发送一个字节数组作为响应体，而不是普通的文本或 JSON 数据。本文将介绍如何在 ASP.NET Core 中使用 HttpResponseMessage 返回字节数组，并提供相关的代码示例。

csharp
public HttpResponseMessage GetByteArrayResponse()
{
    byte[] byteArray = { 0x41, 0x53, 0x50, 0x2E, 0x4E, 0x45, 0x54, 0x20, 0x43, 0x6F, 0x72, 0x65 };
    ByteArrayContent content = new ByteArrayContent(byteArray);
    
    HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
    response.Content = content;
    
    return response;
}

csharp
[HttpGet("download")]
public HttpResponseMessage DownloadFile()
{
    string filePath = "path/to/file.pdf";
    byte[] fileBytes = File.ReadAllBytes(filePath);
    
    ByteArrayContent content = new ByteArrayContent(fileBytes);
    
    HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
    response.Content = content;
    response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
    response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = "file.pdf"
    };
    
    return response;
}