Checks whether a file tag exists.
This method checks whether a file tag with the specified TagId or TagName is attached to the file, directory, or alternate stream specified by FileName. If the specified file tag exists, this method returns true; otherwise it returns false.
The value passed for FileName must be a vault-local absolute path.
To check for a raw file tag, pass its Id for TagId and pass empty string for TagName. To check for a typed file tag, pass its name for TagName and pass 0 for TagId. If values are provided for both TagId and TagName, this method throws an exception.
Please refer to the File Tags topic for more information.
Note: This method can only be called when Active is true.