// UploadCreate is the worksheet function
// It reads the caller, which we need to track for the UploadSelection option,
// gathers all the arguments and then starts the RTD tracking with a call to ExcelAsyncUtil.Observe.
//
// There can be many more arguments
// We might experiment with AllowReference=true for the arguments
// That could improve performance a lot
// But there are concerns:
// * Does Upload get called whenever the contents of the reference change?
// * We need care when we read it (at the Upload-time)
public static object UploadCreate(object arg1, object arg2, object arg3)
{
var caller = XlCall.Excel(XlCall.xlfCaller) as ExcelReference; // Might be null if called in unusual context, e.g. Application.Run
var topicFunctionName = nameof(UploadCreate);
var topicArguments = new object[] { caller, arg1, arg2, arg3 }; // Adding the caller here is important since we need to track it for the RTD topic too
return(ExcelAsyncUtil.Observe(topicFunctionName, topicArguments, () => UploadManager.CreateItem(topicArguments)));
}
