c# - WebRequest GetResponseStream 读取字节

Question

我正在尝试从 ResponeStream 读取字节，但我怎么能说要等待数据呢？

如果我在 GetResponseStream 之后设置断点并等待几秒钟，一切正常。使用 StreamReader.ReadToEnd() 也可以正常工作，但我想自己读取字节。

byte[] response = null;

int left = 0;
int steps = 0;
int pos = 0;

int bytelength = 1024;

OnReceiveStart();

using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse()) {
    using (Stream sr = webResponse.GetResponseStream()) {

        response = new byte[(int)webResponse.ContentLength];

        left = (int)webResponse.ContentLength % bytelength;
        steps = (int)webResponse.ContentLength / bytelength;
        pos = 0;

        for (int i = 0; i < steps; i++) {
            sr.Read(response, pos, bytelength);
            pos += bytelength;
            OnReceiveProgress((int)webResponse.ContentLength, pos);
        }

        if (left != 0) {
            sr.Read(response, pos, left);
        }

        sr.Close();
    }
    webResponse.Close();
}

OnReceiveProgress(1, 1);

OnReceiveFinished();

Answer 1

只是不要将其分解为相同数量的步骤 - 相反，只需继续循环阅读直到完成:

while (pos < response.Length)
{
    int bytesRead = sr.Read(response, pos, response.Length - pos);
    if (bytesRead == 0)
    {
        // End of data and we didn't finish reading. Oops.
        throw new IOException("Premature end of data");
    }
    pos += bytesRead;
    OnReceiveProgress(response.Length, pos);
}

请注意，您必须使用 Stream.Read 的返回值 - 您不能假设它会读取您请求的所有内容为。