如何将 WebResponse 放入内存流?

问题描述

从 WebResponse 获取文件(在本例中为 .PDF，但任何文件都可以)并将其放入 MemoryStream 的最佳方法是什么?使用 WebResponse 中的 .GetResponseStream() 获取一个 Stream 对象，但是如果您想将该 Stream 转换为特定类型的流，您会怎么做?

What is the best way to get a file (in this case, a .PDF, but any file will do) from a WebResponse and put it into a MemoryStream? Using .GetResponseStream() from WebResponse gets a Stream object, but if you want to convert that Stream to a specific type of stream, what do you do?

推荐答案

SoloBold 的 答案 我在测试时发现的.当使用它通过 FtpWebRequest 将文件读入 MemoryStream 时，它间歇性地无法将整个流读入内存.我将其跟踪到 Peek() 有时在前 1460 个字节后返回 -1，即使 Read() 会成功(文件明显大于此).

There is a serious issue with SoloBold's answer that I discovered while testing it. When using it to read a file via an FtpWebRequest into a MemoryStream it intermittently failed to read the entire stream into memory. I tracked this down to Peek() sometimes returning -1 after the first 1460 bytes even though a Read() would have succeeded (the file was significantly larger than this).

相反，我提出以下解决方案:

Instead I propose the solution below:

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

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