Using streamreader to read line containing this "//"? - c#-2.0

Question

Read a Text file having any line starts from "//" omit this line and moved to next line.
The Input text file having some seprate partitions. Find line by line process and this mark.

Answer 1

If you are using .Net 3.5 you can use LINQ with a IEnumerable wrapped around a Stream Reader. This cool part if then you can just use a where statement to file statmens or better yet use a select with a regular expression to just trim the comment and leave data on the same line.
//.Net 3.5
static class Program
{
static void Main(string[] args)
{
var clean = from line in args[0].ReadAsLines()
let trimmed = line.Trim()
where !trimmed.StartsWith("//")
select line;
}
static IEnumerable<string> ReadAsLines(this string filename)
{
using (var reader = new StreamReader(filename))
while (!reader.EndOfStream)
yield return reader.ReadLine();
}
}
...
//.Net 2.0
static class Program
{
static void Main(string[] args)
{
var clean = FilteredLines(args[0]);
}
static IEnumerable<string> FilteredLines(string filename)
{
foreach (var line in ReadAsLines(filename))
if (line.TrimStart().StartsWith("//"))
yield return line;
}
static IEnumerable<string> ReadAsLines(string filename)
{
using (var reader = new StreamReader(filename))
while (!reader.EndOfStream)
yield return reader.ReadLine();
}
}

Answer 2

I'm not sure what you exactly need but, if you just want to filter out // lines from some text in a stream... just remember to close the stream after using it.
public string FilterComments(System.IO.Stream stream)
{
var data = new System.Text.StringBuilder();
using (var reader = new System.IO.StreamReader(stream))
{
var line = string.Empty;
while (!reader.EndOfStream)
{
line = reader.ReadLine();
if (!line.TrimStart(' ').StartsWith("//"))
{
data.Append(line);
}
}
}
return data.ToString();
}

Answer 3

Class SplLineIgnorStrmReader:StreamReader // derived class from StreamReader
SplLineIgnorStrmReader ConverterDefFileReadStream = null;
{
//created the Obj for this Class.
Obj = new SplLineIgnorStrmReader(strFile, Encoding.default);
}
public override string ReadLine()
{
string strLineText = "", strTemp;
while (!EndOfStream)
{
strLineText = base.ReadLine();
strLineText = strLineText.TrimStart(' ');
strLineText = strLineText.TrimEnd(' ');
strTemp = strLineText.Substring(0, 2);
if (strTemp == "//")
continue;
break;
}
return strLineText;
This is if u want to read the Text file and omit any comments from that file(here exclude "//" comment).