Question

I'm writing a plugin that allows a user to clone a case into another project and am having trouble with cloning the case's attachments.

I've got a list of CAttachments and would like to clone each attachment and then pass the new list into CBug.Commit(), but can't figure out how to clone the existing attachments. The only way I can see to create a new CAttachment is by digging it out of the HTTP request stream and callingCAttachmentApi.UploadAttachment(). Am I missing something?

Answer 1

I was able to write the function below that clones an existing attachment. The code requires the plugin to be running in full-trust mode. I hope the FogCreek guys don't mind that I'm looking up their skirt a little bit.

CAttachment CloneAttachment(CAttachment attachment)
{
    // find the type for the internal CAttachment class
    // (this is different from FogCreek.FogBugz.Plugins.Entity.CAttachment)
    var ass = Assembly.Load("FogBugz");
    var tCAttachment = ass.GetType("FogCreek.FogBugz.CAttachment");
    if (tCAttachment == null)
        throw new Exception("Couldn't load 'FogCreek.FogBugz.CAttachment' type.");

    // find the constructor and create an instance
    var ctor = tCAttachment.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance,
                                           null,
                                           new Type[] {},
                                           null);
    if (ctor == null)
        throw new Exception("Couldn't find default CAttachment constructor.");
    var entity = ctor.Invoke(null);

    // create a new attachment record in the DB
    var storeAttachmentMethod = tCAttachment.GetMethod("StoreAttachmentInDB", BindingFlags.Instance | BindingFlags.NonPublic);
    if (storeAttachmentMethod == null)
        throw new Exception("Couldn't find StoreAttachmentInDB method.");

    var ixAttachment = (int)storeAttachmentMethod.Invoke(entity, new object[] {attachment.rgbData, attachment.sFileName});
    if (ixAttachment == 0)
        throw new Exception("Unable to clone attachment.");

    return api.Attachment.GetAttachment(ixAttachment);
}