非網頁的程式，將檔案上傳至 Web 端

1. Upload Files To Remote Url

/// <summary>
/// source from http://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data
/// </summary>
/// <param name="url"></param>
/// <param name="files"></param>
/// <param name="nvc">POST data, if nothing then set null</param>
/// <returns></returns>
public static string UploadFilesToRemoteUrl(string url, FileInfo[] files, NameValueCollection nvc)
{
    string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
    HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create(url);
    httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary;
    httpWebRequest2.Method = "POST";
    httpWebRequest2.KeepAlive = true;
    httpWebRequest2.Credentials =
    System.Net.CredentialCache.DefaultCredentials;

    Stream memStream = new System.IO.MemoryStream();
    byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

    string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
    if (nvc != null)
    {
        foreach (string key in nvc.Keys)
        {
            string formitem = string.Format(formdataTemplate, key, nvc[key]);
            byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
            memStream.Write(formitembytes, 0, formitembytes.Length);
        }
    }

    memStream.Write(boundarybytes, 0, boundarybytes.Length);
    string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";
    foreach(FileInfo fi in files)
    {
        string header = string.Format(headerTemplate, fi.Name, fi.Name);
        byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
        memStream.Write(headerbytes, 0, headerbytes.Length);
        FileStream fileStream = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read);
                
        byte[] buffer = new byte[1024];
        int bytesRead = 0;
        while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
        {
            memStream.Write(buffer, 0, bytesRead);
        }
        memStream.Write(boundarybytes, 0, boundarybytes.Length);
        fileStream.Close();
    }

    httpWebRequest2.ContentLength = memStream.Length;

    Stream requestStream = httpWebRequest2.GetRequestStream();

    memStream.Position = 0;
    byte[] tempBuffer = new byte[memStream.Length];
    memStream.Read(tempBuffer, 0, tempBuffer.Length);
    memStream.Close();
    requestStream.Write(tempBuffer, 0, tempBuffer.Length);
    requestStream.Close();


    WebResponse webResponse2 = httpWebRequest2.GetResponse();
    Stream stream2 = webResponse2.GetResponseStream();
    StreamReader reader2 = new StreamReader(stream2);
    string result = reader2.ReadToEnd();

    webResponse2.Close();
    httpWebRequest2 = null;
    webResponse2 = null;

    return result;
}

2. Server site, process request

public void ProcessRequest (HttpContext context) 
{
    context.Response.ContentType = "text/plain";
    string UploadServerPath = context.Server.MapPath("Upload");

    int loop1;
    HttpFileCollection Files = context.Request.Files; // Load File collection into HttpFileCollection variable.
    string[] arr1 = Files.AllKeys;  // This will get names of all files into a string array. 
    for (loop1 = 0; loop1 < arr1.Length; loop1++)
    {
        context.Response.Write("File: " + context.Server.HtmlEncode(arr1[loop1]) + "<br />");
        context.Response.Write("  size = " + Files[loop1].ContentLength + "<br />");
        context.Response.Write("  content type = " + Files[loop1].ContentType + "<br />");
        Files[loop1].SaveAs(
            Path.Combine(UploadServerPath, Path.GetFileName(Files[loop1].FileName))
            );
    }
    
    context.Response.Write(string.Format("has upload {0} file.<br />" , arr1.Length));

    //POST data
    foreach (string key in context.Request.Form.AllKeys)
    {
        context.Response.Write(string.Format("{0}={1}<br />", key, context.Request.Form[key]));    
    }
        
}