KeyView 24.4
KeyView Filter SDK .NET Programming Guide

# Partial Filtering

In some cases you might not want to filter all of the text from a file or stream. You might prefer to stop filtering, saving time and resources, as soon as you find the information that you require.

You can read filtered text from a stream provided by the `Text()` method on your `Document` object. This allows you to stop processing before the end of the stream. KeyView only processes as much of the document as it needs to output the text you read.

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    using (Document myDoc = session.Open(inputFilePathOrStream))
    {
        try
        {
            using (FileStream fs = File.Create(outputFilePath))
            using (StreamWriter sw = new StreamWriter(fs))
            using (DocumentStreamReader dsr = myDoc.Text())
            {
                while (!dsr.EndOfStream)
                {
                    // Read filtered text one line at a time
                    var filterOutput = dsr.ReadLine();

                    Console.WriteLine(filterOutput);
                    sw.WriteLine(filterOutput);

                    // Here the program can check to see if a certain
                    // condition is met, and stop filtering
                }
            }
        }
        catch (KeyViewException e)
        {
            Console.WriteLine($"{e.Message}");
        }
    }

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Version 24.4 | Last updated September 2024

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Product: IDOL KeyView 24.4

Topic Title: Partial Filtering