MVC断点续传

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[HttpGet]

[HttpPost]

public HttpResponseMessage Upload()

{

    // Get a reference to the file that our jQuery sent.  Even with multiple files, they will all be their own request and be the 0 index

    HttpPostedFile file = HttpContext.Current.Request.Files[0];

    // do something with the file in this space

    // {....}

    // end of file doing

    this.SaveAs(HttpContext.Current.Server.MapPath("~/Images/") + file.FileName, file);

    // Now we need to wire up a response so that the calling script understands what happened

    HttpContext.Current.Response.ContentType = "text/plain";

    var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();

    var result = new { name = file.FileName };

    HttpContext.Current.Response.Write(serializer.Serialize(result));

    HttpContext.Current.Response.StatusCode = 200;

    // For compatibility with IE‘s "done" event we need to return a result as well as setting the context.response

    return new HttpResponseMessage(HttpStatusCode.OK);

}

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private void SaveAs(string saveFilePath, HttpPostedFile file)

{

    long lStartPos = 0;

    int startPosition = 0;

    int endPosition = 0;

    var contentRange=HttpContext.Current.Request.Headers["Content-Range"];

    //bytes 10000-19999/1157632

    if (!string.IsNullOrEmpty(contentRange))

    {

        contentRange = contentRange.Replace("bytes", "").Trim();

        contentRange = contentRange.Substring(0, contentRange.IndexOf("/"));

        string[] ranges = contentRange.Split(‘-‘);

        startPosition = int.Parse(ranges[0]);

        endPosition = int.Parse(ranges[1]);

    }

    System.IO.FileStream fs;

    if (System.IO.File.Exists(saveFilePath))

    {

        fs = System.IO.File.OpenWrite(saveFilePath);

        lStartPos = fs.Length;

    }

    else

    {

        fs = new System.IO.FileStream(saveFilePath, System.IO.FileMode.Create);

        lStartPos = 0;

    }

    if (lStartPos > endPosition)

    {

        fs.Close();

        return;

    }

    else if (lStartPos < startPosition)

    {

        lStartPos = startPosition;

    }

    else if (lStartPos > startPosition && lStartPos < endPosition)

    {

        lStartPos = startPosition;

    }

    fs.Seek(lStartPos, System.IO.SeekOrigin.Current);

    byte[] nbytes = new byte[512];

    int nReadSize = 0;

    nReadSize = file.InputStream.Read(nbytes, 0, 512);

    while (nReadSize > 0)

    {

        fs.Write(nbytes, 0, nReadSize);

        nReadSize = file.InputStream.Read(nbytes, 0, 512);

    }

    fs.Close();          

}