see on GitHub

    How to Check if an Attachment Exists

    • To check whether a document contains a certain attachment,
      use the method Exists() from the Advanced.Attachments session operations.

    • Calling 'Exists' does not Load the document or the attachment to the session,
      and the session will not track them.

    • In this page:

    Check if attachment exists 

    bool exists = session
    .Advanced
    .Attachments
    .Exists("categories/1-A", "image.jpg");

if (exists)
{
    // attachment 'image.jpg' exists on document 'categories/1-A'
}
    bool exists = await asyncSession
    .Advanced
    .Attachments
    .ExistsAsync("categories/1-A", "image.jpg");

if (exists)
{
    // attachment 'image.jpg' exists on document 'categories/1-A'
}

    Syntax 

    bool Exists(string documentId, string attachmentName);
    Task<bool> ExistsAsync(string documentId, string attachmentName, CancellationToken token = default);
    Parameter Type Description
    documentId string The ID of the document you want to check
    attachmentName string The name of the attachment you are looking for
    Return Value Description
    bool true - The specified attachment exists on the document
    false - The attachment does not exist on the document

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