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I'm trying to read a large file from a disk and report percentage while it's loading. The problem is FileInfo.Length is reporting different size than my Encoding.ASCII.GetBytes().Length. 

    public void loadList()
    {
        string ListPath = InnerConfig.dataDirectory + core.operation[operationID].Operation.Trim() + "/List.txt";
        FileInfo f = new FileInfo(ListPath);

        int bytesLoaded = 0;

        using (FileStream fs = File.Open(ListPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
        using (BufferedStream bs = new BufferedStream(fs))
        using (StreamReader sr = new StreamReader(bs))
        {
            string line;
            while ((line = sr.ReadLine()) != null)
            {
                byte[] array = Encoding.ASCII.GetBytes(line);
                bytesLoaded += array.Length;
            }
        }

        MessageBox.Show(bytesLoaded + "/" + f.Length);
    }

The result is 

    13357/15251

There's 1900 bytes 'missing'. The file contains list of short strings. Any tips why it's reporting different file sizes? does it has to do anything with '\r' and '\n' characters in the file? In addition, I have the following line:

    int bytesLoaded = 0;

if the file is lets say 1GB large, do I have to use 'long' instead? Thank you for your time!

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3 回答 3

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于 2013-06-07T09:58:53.633 回答
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It's the line endings which get swallowed by ReadLine, and could also possibly be because your source file is in a more verbose encoding than ASCII (perhaps it's UTF8?).

int.MaxValue is 2147483647, so you're going to run into problem using an int for bytesLoaded if your file is >2GB. Switch to a long. After all, FileInfo.Length is defined as a long.

于 2013-06-07T10:00:12.293 回答
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The ReadLine method removes the trailing line termination character.

于 2013-06-07T09:59:06.267 回答