C# StreamReader, “ReadLine” For Custom Delimiters

Question

What is the best way to have the functionality of the StreamReader.ReadLine() method, but with custom (String) delimiters?

I\'d like to do something like:

Answer 1

Here is a simple parser I used where needed (usually if streaming is not a paramount just read and .Split does the job), not too optimized but should work fine:
(it's more of a Split like method - and more notes below)

    public static IEnumerable Split(this Stream stream, string delimiter, StringSplitOptions options)
    {
        var buffer = new char[_bufffer_len];
        StringBuilder output = new StringBuilder();
        int read;
        using (var reader = new StreamReader(stream))
        {
            do
            {
                read = reader.ReadBlock(buffer, 0, buffer.Length);
                output.Append(buffer, 0, read);

                var text = output.ToString();
                int id = 0, total = 0;
                while ((id = text.IndexOf(delimiter, id)) >= 0)
                {
                    var line = text.Substring(total, id - total);
                    id += delimiter.Length;
                    if (options != StringSplitOptions.RemoveEmptyEntries || line != string.Empty)
                        yield return line;
                    total = id;
                }
                output.Remove(0, total);
            }
            while (read == buffer.Length);
        }

        if (options != StringSplitOptions.RemoveEmptyEntries || output.Length > 0)
            yield return output.ToString();
    }

...and you can simply switch to char delimiters if needed just replace the

while ((id = text.IndexOf(delimiter, id)) >= 0)

...with

while ((id = text.IndexOfAny(delimiters, id)) >= 0)

(and id++ instead of id+= and a signature this Stream stream, StringSplitOptions options, params char[] delimiters)

...also removes empty etc.
hope it helps