using statement FileStream and / or StreamReader - Visual Studio 2012 Warnings

The new Visual Studio 2012 is complaining about a common code combination I have always used. I know it seems like overkill but I have done the following in my code 'just to be sure'.

using (var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
    using (var sr = new StreamReader(fs))
    {
        // Code here
    }
}

Visual studio is 'warning' me that I am disposing of fs more than once. So my question is this, would the proper way to write this be:

using (var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
    var sr = new StreamReader(fs);
    // do stuff here
}

Or should I do it this way (or some other variant not mentioned).

var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

using (var sr = new StreamReader(fs))
{
    // Code here
}

I searched several questions in StackOverflow but did not find something that addressed the best practice for this combination directly.

Thank you!

Solution 1:

The following is how Microsoft recommends doing it. It is long and bulky, but safe:

FileStream fs = null;
try
{
    fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
    using (TextReader tr= new StreamReader(fs))
    {
        fs = null;
        // Code here
    }
}
finally
{
    if (fs != null)
        fs.Dispose();
}

This method will always ensure that everything is disposed that should be despite what exceptions may be thrown. For example, if the StreamReader constructor throws an exception, the FileStream would still be properly disposed.

Solution 2:

Visual studio is 'warning' me that I am disposing of fs more than once.

You are, but that is fine. The documentation for IDisposable.Dispose reads:

If an object's Dispose method is called more than once, the object must ignore all calls after the first one. The object must not throw an exception if its Dispose method is called multiple times.

Based on that, the warning is bogus, and my choice would be to leave the code as it is, and suppress the warning.

Solution 3:

As Dan's answer only appears to work with StreamWriter, I believe this might be the most acceptable answer. (Dan's answer will still give the disposed twice warning with StreamReader - as Daniel Hilgarth and exacerbatedexpert mentions, StreamReader disposes the filestream)

using (TextReader tr = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
{
    string line;
    while ((line = tr.ReadLine()) != null)
    {
        // Do work here
    }
}

This is very similar to Daniel Hilgarth's answer, modified to call dispose via the Using statement on StreamReader as it is now clear StreamReader will call dispose on FileStream (According to all the other posts, documentation referenced)

Update:

I found this post. For what it is worth. Does disposing streamreader close the stream?