断点续传

基于Range

using System;
using System.IO;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
 
namespace Video3dApp.Controllers
{
    public class Video3dController : Controller
    {
 
        public ActionResult BrandUSA() {
            return View();
        }
 
        public ActionResult Detail() {
            return View();
        }
        
        [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Post | HttpVerbs.Options)]
        public void ReadVideo() {
            var reqRange = Request.Headers["Range"];
            string[] reqBlockRange = null;
            if ( !string.IsNullOrEmpty(reqRange) ) {
                reqBlockRange = reqRange.Replace("bytes=", "").Split('-');
                Response.StatusCode = 206;
                Response.AddHeader("status", "206");
            }
 
            Response.AddHeader("accept-ranges", "bytes");
            Response.AddHeader("access-control-allow-methods", "HEAD, GET, OPTIONS");
            Response.AddHeader("access-control-allow-origin", "*");
            Response.AddHeader("cache-control", "public, max-age=30726563");
            Response.AddHeader("content-disposition", $"attachment;  filename=test.mp4");
            Response.ContentType = "video/mp4";
 
            string fileName = Server.MapPath("/UploadFiles/test.mp4");
 
            using ( var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite) )
            using (var reader=new BinaryReader(stream)) {
                long fileSize = stream.Length;
 
                long startPosition = 0;
                long partialSize = fileSize;
                if ( reqBlockRange != null ) {
                    startPosition = Convert.ToInt32(reqBlockRange[0]);
                    partialSize = fileSize - startPosition;
                }
 
                //Read partial content into the buffer with a specified size
                byte[] buffer = new byte[(int)partialSize];
                // go to offset address 
                reader.BaseStream.Seek(startPosition, SeekOrigin.Begin);
 
                // fill buffer from starting at address to address + BlockSise
                reader.Read(buffer, 0, (int)partialSize);
                Response.AddHeader("content-range", $"bytes {startPosition}-{startPosition + partialSize - 1}/{fileSize}");
                Response.AddHeader("Content-Length", $"{partialSize}");
                Response.BinaryWrite(buffer);
            }
        }
    }
}