c# - 使用 asp.net 通过移动应用发送文件上传的步骤

Question

我有移动应用程序，即基于 Android、IPhone 的应用程序，我必须在其中上传图像，在服务器端，我使用的是 asp.net、Web 服务“.asmx”。现在我不知道如何接收任何移动应用程序发送的文件，或者简单地说，我必须在服务器端做什么才能获取该文件并将其存储在我的本地系统中？我尝试了以下方法

• 我已经创建了一个 asp.net 页面，我在其中放置了控件并使用 multipart/form-data 发布了文件，但是应用程序开发人员希望我为他们提供带有将接收文件名的参数的 url然后上传到服务器。

但是如何实现呢？

Answer 1

这就是我使用 WebMethod 实现文件上传的方式，android 和 Apple 应用程序都使用此 WebMethod 在服务器上上传文件，我使用 google chrome 扩展 Advanced rest client 对其进行了测试，以阅读有关 rest API Client 的更多信息 Click Here

[WebMethod]
public void UploadFile()
{
    FileResponse master = new FileResponse();
    //HTTP Context to get access to the submitted data
    HttpContext postedContext = HttpContext.Current;
    //File Collection that was submitted with posted data
    HttpFileCollection Files = postedContext.Request.Files;
    string sessionId = Server.UrlDecode((string)postedContext.Request.Form["sessionId"]);
    master.sessionId = sessionId;
    master.timeStamp = DateTime.Now.DdMonYyyy_HhMmSs();
    master.status = Status.Failure;
    master.sessionStatus = Status.Failure;
    master.message = "Image not found";
    try
    {
        if (isGuest_Employee(sessionId))
        {
            //Make sure a file was posted
            string fileName = string.Format("feedbackImgSign_{0}.png", Helper.LDFileNumberSeq);
            if (Files.Count == 1 && Files[0].ContentLength >= 1)
            {
                //The byte array we'll use to write the file with
                byte[] binaryWriteArray = new
                byte[Files[0].InputStream.Length];
                //Read in the file from the InputStream
                Files[0].InputStream.Read(binaryWriteArray, 0,
                (int)Files[0].InputStream.Length);
                //Open the file stream
                FileStream objfilestream = new FileStream(Helper.UploadedFilesDirectory + "\\" +
                fileName, FileMode.Create, FileAccess.ReadWrite);
                //Write the file and close it
                objfilestream.Write(binaryWriteArray, 0,
                binaryWriteArray.Length);
                objfilestream.Close();

                master.FILE_NAME = fileName;
                master.status = Status.Success;
                master.sessionStatus = Status.Success;
                master.message = "Image uploaded successfully!";
            }
        }
        else
        {
            master.status = Status.Failure;
            master.sessionStatus = Status.Failure;
            master.message = "Unable to authenticate provided session Id";
        }
    }
    catch (Exception ex)
    {
        master.status = Status.Failure;
        master.message = ex.Message;
    }

   string strJSON = JsonConvert.SerializeObject(master, Formatting.Indented,
           new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore });

    Context.Response.Clear();
    Context.Response.ContentType = "application/json";
    Context.Response.Write(strJSON);
}