Question

How can i copy the contents of one FlowDocument to another FlowDocument below is what i tryed

foreach (var blk in fd1.Blocks)
{
   fd2.Blocks.Add(blk);
}

fd1 is FlowDocument1 and fd2 is FlowDocument2.

But i get the below error.

Collection was modified; enumeration operation may not execute.

Thanks

Arvind

Answer 1

Because each Block is ‘owned’ by a FlowDocument, it cannot just be added to another. You must serialize it and then deserialize it, which breaks the bond with the original FlowDocument, which allows you to add it to another.

/// <summary>
/// Adds one flowdocument to another.
/// </summary>
/// <param name="from">From.</param>
/// <param name="to">To.</param>
public static void AddDocument(FlowDocument from, FlowDocument to)
{
    TextRange range = new TextRange(from.ContentStart, from.ContentEnd);
    MemoryStream stream = new MemoryStream();
    System.Windows.Markup.XamlWriter.Save(range, stream);
    range.Save(stream, DataFormats.XamlPackage);
    TextRange range2 = new TextRange(to.ContentEnd, to.ContentEnd);
    range2.Load(stream, DataFormats.XamlPackage);
}

This was copied from:

http://social.msdn.microsoft.com/Forums/en/wpf/thread/f4b26d9b-5b74-446b-85e7-e49e519380ad