How can I determine the index in codepage 850 for a char in C#?

I have a text file which is encoded with codepage 850. I am reading this file the following way:

using (var reader = new StreamReader(filePath, Encoding.GetEncoding(850)))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        //...
    }
    //...
}

Now I need for every character in the string line in the loop above the zero-based index of that character which it has in codepage 850, something like:

for (int i = 0; i <开发者_高级运维; line.Length; i++)
{
    int indexInCodepage850 = GetIndexInCodepage850(line[i]); // ?
    //...
}

Is this possible and how could int GetIndexInCodepage850(char c) look like?

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Use Encoding.GetBytes() on the line. CP850 is an 8-bit encoding, so the byte array should have just as many elements as the string had characters, and each element is the value of the character.

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Just read the file as bytes, and you have the codepage 850 character codes:

byte[] data = File.ReadAllBytes(filePath);

You don't get it separated into lines, though. The character codes for CR and LF that you need to look for in the data are 13 and 10.

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You don't need to.

You are already specifying the encoding in the streamreader constructor. The string returned from reader.ReadLine() will already have been encoding using CP850