Add Signature while replying using Selection c# vsto addin

Question

I am new to C# VSTO Add-In development and am trying to add a signature at the cursor's location. However, I'm unable to insert HTML and can only add plain text. How can I append HTML instead?

I tried the code below and was able to add text. How can I append HTML instead?

// Get the active Inspector (email editor)
Outlook.Inspector inspector = outlookApp.ActiveInspector();

if (inspector != null && inspector.CurrentItem is Outlook.MailItem mailItem)
{
    // Get the Word editor for the email
    Document wordDocument = inspector.WordEditor as Document;

    if (wordDocument != null)
    {
        // Access the current selection (cursor position)
        Selection selection = wordDocument.Application.Selection;

        if (selection != null)
        {
            // Insert HTML at the current selection (cursor position)
            Range range = selection.Range;
            selection.TypeText(signature);
            // Set the range's HTML format to preserve HTML tags
            range.FormattedText = wordDocument.Application.Selection.FormattedText;
            // Set the email's HTML body to include the new HTML content
            //mailItem.HTMLBody = mailItem.HTMLBody.Insert(mailItem.HTMLBody.Length, "Ram");
            return "NOTREQUIRED";
        }

    }
}

Then tried below code,

//Insert the HTML content at the current cursor position
 selection.Range.InsertAfter(htmlContent);

HTML is not being added in this location. I'm not sure what I did wrong. Can you help me figure it out?

Dmitry Streblechenko · Accepted Answer · 2024-12-26 15:21:22Z

0

Try to use Range.InsertFile to insert the signature's HTML file.

answered Dec 26, 2024 at 15:21

Dmitry Streblechenko

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15 Comments

Ramakrishnan Ramar Dec 26, 2024 at 16:09

This is being added as an attachment instead of appending to the existing HTML content.

Dmitry Streblechenko Dec 26, 2024 at 16:41

When you call Range.InsertFile? Or are you are using Attachments.Add?

Ramakrishnan Ramar Dec 26, 2024 at 16:43

I need to add the signature design as rich text instead of adding it as plain text. Updated the question, Please have a look.

Dmitry Streblechenko Dec 26, 2024 at 17:54

TypeText assumes plain text. Once again, do use Range.InsertFile - it figures out the text type (txt/html/rtf) based on the file extension.

Ramakrishnan Ramar Dec 27, 2024 at 2:27

It's adding as attachment.

|

Ramakrishnan Ramar · Accepted Answer · 2024-12-28 08:30:15Z

Used tricky way, just paste the HTML using below functions, and it's working.

public void SetClipboardHtml(string htmlContent)
{
    string preamble = "Version:0.9\r\n";
    string htmlStart = "<html><body><!--StartFragment-->";
    string htmlEnd = "<!--EndFragment--></body></html>";

    string fullHtml = htmlStart + htmlContent + htmlEnd;

    int startHtml = preamble.Length;
    int startFragment = startHtml + htmlStart.Length;
    int endFragment = startFragment + htmlContent.Length;
    int endHtml = endFragment + htmlEnd.Length;

    string clipboardFormat = $"{preamble}" +
        $"StartHTML:{startHtml:D8}\r\n" +
        $"EndHTML:{endHtml:D8}\r\n" +
        $"StartFragment:{startFragment:D8}\r\n" +
        $"EndFragment:{endFragment:D8}\r\n" +
        $"{fullHtml}";
    Clipboard.Clear();
    Clipboard.SetText(clipboardFormat, TextDataFormat.Html);
}

if (selection != null)
{
    SetClipboardHtml(signature);
    selection.Paste();
    return "NOTREQUIRED";
}

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