如何监控流的下载进度

Question

我从 SharePoint 获得文件的“流”。我想将整个文件从 Internet 复制到 PC 上的本地文件，但我想在下载过程中获得状态。如何？ FileStream 和 StreamReader 在不执行没有进度更新的完整“CopyTo”时似乎存在字节与字符差异。必须有更清洁的方法...

using (var sr = new StreamReader(fileData.Value))
{
    using (FileStream fs = new FileStream(localFile + "_tmp", FileMode.Create))
    {
        byte[] block = new byte[1024];
        // only guessing something like this is necessary...
        int count = (int)Math.Min(sr.BaseStream.Length - sr.BaseStream.Position, block.Length);
        while (sr.BaseStream.Position < sr.BaseStream.Length)
        {
            // read  requires char[]
            sr.Read(block, 0, count);
            // write requires byte[]
            fs.Write(block, 0, count);
            Log("Percent complete: " + (sr.BaseStream.Position / sr.BaseStream.Length));
            count = (int)Math.Min(sr.BaseStream.Length - sr.BaseStream.Position, block.Length);
        }
    }
}

Answer 1

只需要使用 BinaryReader 而不是 StreamReader。轻松愉快。