Writing Your Own Task that Uses a FilterChain

I'm trying to write my own "write" task that uses a filterchain. I want to be
able to write to a file (i.e. I am creating an xml file) and replace some
strings in the process using the replacestring filter. I am basing my code
off of the CopyTask but I can't seem to figure out how to use the
PhysicalTextReader class. I am trying the following:

PhysicalTextReader ChainedReader = null;
try
{
    Writer = this.GetWriter();
    Reader = new StringReader(this.Text.Value);
    ChainedReader = new PhysicalTextReader(Reader);
    Filter FilterReader =  this.Filter.GetBaseFilter(ChainedReader);
    while (!false)
    {
        int Focus = FilterReader.Read();
        if (!(Focus > -1))
        {
            break;
        }
        Writer.Write((Char)Focus);
    }
}

However, I can use the PhysicalTextReader due to its protection level. 

Any thoughts?
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