ComponentOne WPF Edition
Working with WPF RichTextBox / Custom Command Bars / Document History Functions
Document History Functions

The following snippets demonstrates the code used to create document history functions:

Undo

C#
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if(rtb.DocumentHistory.CanUndo)
{
    rtb.DocumentHistory.Undo();
}

Redo

C#
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if(rtb.DocumentHistory.CanRedo)
{
    rtb.DocumentHistory.Redo();
}