如何删除作为HttpResponseMessage的StreamContent发送的文件

事实上 your comment 帮助解决了这个问题。。。我在这里写到:

Delete temporary file sent through a StreamContent in ASP.NET Web API HttpResponseMessage

这是对我有效的方法。注意里面的呼叫顺序 Dispose 与您的评论不同:

public class FileHttpResponseMessage : HttpResponseMessage
{
    private string filePath;

    public FileHttpResponseMessage(string filePath)
    {
        this.filePath = filePath;
    }

    protected override void Dispose(bool disposing)
    {
        base.Dispose(disposing);

        Content.Dispose();

        File.Delete(filePath);
    }
}

从具有DeleteOnClose选项的FileStream创建StreamContent。

return new HttpResponseMessage(HttpStatusCode.OK)
{
    Content = new StreamContent(
        new FileStream("myFile.txt", FileMode.Open, 
              FileAccess.Read, FileShare.None, 4096, FileOptions.DeleteOnClose)
    )
};

我首先将文件读取到字节[]中,删除文件,然后返回响应:

        // Read the file into a byte[] so we can delete it before responding
        byte[] bytes;
        using (var stream = new FileStream(path, FileMode.Open))
        {
            bytes = new byte[stream.Length];
            stream.Read(bytes, 0, (int)stream.Length);
        }
        File.Delete(path);

        HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
        result.Content = new ByteArrayContent(bytes);
        result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        result.Content.Headers.Add("content-disposition", "attachment; filename=foo.bar");
        return result;