Update Length

This out-of-the-box autoupdater updates a designated length field on linear features with the value from the Esri field, Shape_Length. You can designate which length field you would like updated by using the parameter, se_lengthField. Each time a new linear feature is created, or the geometry of an existing feature is edited, the chosen length field updates to match the value found in Shape_Length. The autoupdater uses the scale value on the chosen length field to determine the number of decimal places to use. It enters the length value as a double data type. 

Set your se_lengthField equal to the name of the field that you want updated with the Shape_Length value. Ensure you're using the field name and not the display name. You can find this field name easily in ArcGIS Pro. From the Contents pane, right-click on the layer, select Data Design, and then Fields. From this view, you can easily view the field names; e.g., measuredlength may be the field name while Measured Length may be its alias. Be sure to put quotes around your parameter value.