ASP.NET WebApi实现文件下载

• 普通下载

  public class DownLoadController : ApiController
      {
          //响应的MimeType类型
          private const string MimeType = "application/octet-stream";
  
          //待下载文件存放目录
          private readonly string DirFilePath = "D:\\SoftWare";
  
          /// <summary>
          /// 缓冲区大小
          /// </summary>
          private const int BufferSize = 80 * 1024;
  
          // GET api/<controller>
          public HttpResponseMessage Get(string fileName = "SD_GhostWin10X64RS4Pro_228.iso")
          {
              var fullFilePath = Path.Combine(DirFilePath, fileName);
  
              if (!File.Exists(fullFilePath))
              {
                  throw new HttpResponseException(HttpStatusCode.NotFound);
              }
  
              FileStream fileStream = File.Open(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
  
              var response = new HttpResponseMessage();
  
              response.Content = new StreamContent(fileStream, BufferSize);
  
              response.Content.Headers.ContentDisposition
                  = new ContentDispositionHeaderValue("attachment") { FileName = fileName };
  
              response.Content.Headers.ContentType
                  = new MediaTypeHeaderValue(MimeType);
  
              response.Content.Headers.ContentLength
                  = fileStream.Length;
  
              return response;
          }
      }