.net - 在 Silverlight 中使用 HttpResponse 上传数据

Question

如何在 Silverlight 中使用异步双向二进制上传和下载数据？

我需要将我的二进制文件上传到服务器然后 >

从服务器

以二进制文件的形式获取答案

我当前使用的样本是这样的:
http://msdn.microsoft.com/en-us/library/system.net.webrequest.begingetresponse.aspx

但是示例以请求开始，我需要从上传开始。

我尝试过使用 WebClient，但我无法按一个顺序进行上传/下载:Bidirectional use of Webclient for binary

Answer 1

AHSX 是一种方法，但要特别考虑超过 4 MB 的文件。

你需要做两件事:

服务器端:将处理接收到的数据的 Ashx HttpHandler:

公共(public)类文件上传:IHttpHandler
{
公共(public)无效ProcessRequest(HttpContext上下文)
{
_httpContext = 上下文；

    if (context.Request.InputStream.Length == 0)
        throw new ArgumentException("No file input");

    try
    {
        // Method that will be populating parameters from HttpHandler Request.
        GetQueryStringParameters();

        string uploadFolder = _directory;
        string tempFileName = _fileName + _tempExtension;

        if (_firstChunk)
        {
            //// Delete temp file
            if (File.Exists(@HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + tempFileName))
                File.Delete(@HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + tempFileName);

            //// Delete target file
            if (File.Exists(@HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + _fileName))
                File.Delete(@HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + _fileName);

        }



        using (FileStream fs = File.Open(@HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + tempFileName, FileMode.Append))
        {
            SaveFile(context.Request.InputStream, fs);
            fs.Close();
        }

        if (_lastChunk)
        {
            File.Move(HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + tempFileName, HostingEnvironment.ApplicationPhysicalPath + "/" + uploadFolder + "/" + _fileName);
        }


    }
    catch (Exception e)
    {
        // Todo
        // Logger Exception
        throw;
    }

}

}

将调用它的 Silverlight 类:

公共(public)类上传文件
{

公共(public)无效上传(流streamNewFile，字符串文件名，字符串dirOnServer =“”)
{
this.uploadMode = UploadMode.OpenStream;

        this.destinationOnServer = dirOnServer;
        this.fileStream = streamNewFile;
        this.fileName = fileName;
        this.dataLength = this.fileStream.Length;

        long dataToSend = this.dataLength - this.dataSent;
        bool isLastChunk = dataToSend <= this.chunkSize;
        bool isFirstChunk = this.dataSent == 0;
        string docType = "document";

        var strCurrentHost = HtmlPage.Document.DocumentUri.ToString().Substring(0, HtmlPage.Document.DocumentUri.ToString().LastIndexOf('/'));
        UriBuilder httpHandlerUrlBuilder = new UriBuilder(strCurrentHost + "/FileUpload.ashx");
        httpHandlerUrlBuilder.Query = string.Format("{5}file={0}&offset={1}&last={2}&first={3}&docType={4}&destination={6}",
            fileName, this.dataSent, isLastChunk, isFirstChunk, docType,
            string.IsNullOrEmpty(httpHandlerUrlBuilder.Query) ? string.Empty : httpHandlerUrlBuilder.Query.Remove(0, 1) + "&", destinationOnServer);

        HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(httpHandlerUrlBuilder.Uri);
        webRequest.Method = "POST";
        webRequest.BeginGetRequestStream(new AsyncCallback(this.WriteToStreamCallback), webRequest);
    }

}