Changed VIs and functions in LabVIEW 2020.

  • The default data type of the name or relative path input of the Build Path function is changed from string to path. When you create a control or constant from this input, the data type is a path. This input still also accepts a string.
  • The To More Specific Class and To More Generic Class functions add support for interfaces. Use these functions to cast a wire of one class or interface type to another class or interface type.
  • The Assert Same or Descendant Type VI adds support for interfaces. This VI breaks the calling VI unless the input data is the same as or is a descendant of the input class or interface.
  • The Call Parent Method node is renamed Call Parent Class Method. Use this node to call the nearest ancestor implementation of a class method.
  • The TDMS File Viewer VI and TDMS File Viewer dialog box are redesigned to be more intuitive. You can display data from a .tdms file and change visualization settings all in a single page instead of switching between multiple tabs.
  • In previous versions of LabVIEW, the Merge Errors function always returns the first error or warning in the input error clusters. In LabVIEW 2020, you can configure the function to return an error cluster that combines all of the input errors and warnings by right-clicking the function and selecting Retain All Errors.