How to load a text file in a RichTextBox control in WPF

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The following code snippet shows how to load a text file in RichTextBox (RTB). Using the same approach, you may use any file.

The XAML user interface is listed here:

<Window x:Class="RichTextBoxSample.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="300" Width="490">

<Grid>

<Run>First paragraph goes here. Type some text here.</Run>

</Paragraph>

<Run>Second paragraph goes here. Type some text here.</Run>

</Paragraph>

</FlowDocument>

</RichTextBox>

<Button Height="36" Margin="12,0,0,34" Name="button1" VerticalAlignment="Bottom"

HorizontalAlignment="Left" Width="97" Click="button1_Click">Get Contents</Button>

<Button Height="32" HorizontalAlignment="Right" Margin="0,18,15,0" Name="LoadButton"

VerticalAlignment="Top" Width="145" Click="LoadButton_Click">Load</Button>

<Button Height="37" HorizontalAlignment="Right" Margin="0,59,15,0" Name="SaveButton"

VerticalAlignment="Top" Width="144" Click="SaveButton_Click">Save</Button>

<Button HorizontalAlignment="Right" Margin="0,110,13,115" Name="PrintButton"

Width="148" Click="PrintButton_Click">Print</Button>

<Button Height="41" Margin="130,0,215,29" Name="ClearButton" VerticalAlignment="Bottom" Click="ClearButton_Click">Clear</Button>

</Grid>

</Window>

Here is the Load button click event handler.

private void LoadButton_Click(object sender, RoutedEventArgs e)

{

string fileName = @"C:\junk\test.txt";

TextRange range;

FileStream fStream;

if (File.Exists(fileName))

{

range = new TextRange(RTB.Document.ContentStart, RTB.Document.ContentEnd);

fStream = new FileStream(fileName, FileMode.OpenOrCreate);

range.Load(fStream, DataFormats.Text );

fStream.Close();

}