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   源码介绍

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Web.Http;

namespace DownloadFileFromWebApi.Controllers
{
  [RoutePrefix("download")]
  public class DownloadController : ApiController
  {
    [Route("get_demo_file")]
    public HttpResponseMessage GetFileFromWebApi()
    {
      try
      {
        var FilePath = System.Web.Hosting.HostingEnvironment.MapPath(@"~/download/EditPlus64_xp85.com.zip");
        var stream = new FileStream(FilePath, FileMode.Open);
        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { 
        FileName="Wep Api Demo File.zip"
        };
        return response;
      }
      catch
      {
        return new HttpResponseMessage(HttpStatusCode.NoContent);
      }
    }
  }
}