如何将WebResponse放入内存流？

Question

从WebResponse获取文件(在本例中为.PDF,但任何文件都可以)的最佳方法是什么,并将其放入MemoryStream？使用WebResponse中的.GetResponseStream()获取Stream对象,但是如果要将该Stream转换为特定类型的流,您会怎么做？

Answer 1

在测试时我发现SoloBold的答案存在严重问题.当使用它来读取经由一个文件FtpWebRequest到一个MemoryStream它间歇地未能读取整个流到内存中.我跟踪到Peek()有时在第一个1460字节之后返回-1,即使a Read()会成功(文件明显大于此).

相反,我提出以下解决方案:

MemoryStream memStream;
using (Stream response = request.GetResponseStream()) {
    memStream = new MemoryStream();

    byte[] buffer = new byte[1024];
    int byteCount;
    do {
        byteCount = stream.Read(buffer, 0, buffer.Length);
        memStream.Write(buffer, 0, byteCount);
    } while (byteCount > 0);
}

// If you're going to be reading from the stream afterwords you're going to want to seek back to the beginning.
memStream.Seek(0, SeekOrigin.Begin);

// Use memStream as required

Answer 2

大约一年前从网上复制的。

//---------- Start HttpResponse
if(objHttpWebResponse.StatusCode == HttpStatusCode.OK)
    {
        //Get response stream
        objResponseStream = objHttpWebResponse.GetResponseStream();

        //Load response stream into XMLReader
        objXMLReader = new XmlTextReader(objResponseStream);

        //Declare XMLDocument
        XmlDocument xmldoc = new XmlDocument();
        xmldoc.Load(objXMLReader);

        //Set XMLResponse object returned from XMLReader
        XMLResponse = xmldoc;

        //Close XMLReader
        objXMLReader.Close();
    }

    //Close HttpWebResponse
    objHttpWebResponse.Close();
}