ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / StyleHelper Class / AddStyle Method
The current ArcGIS Pro project to which the style has to be added.
Name of a core ArcGIS Pro style or the full path to a style file (.stylx) on disk that has to be added to the current project.
Example Version

AddStyle Method
Adds the specified style to the current project. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public static void AddStyle( 
   Project project,
   string styleName
)

Parameters

project
The current ArcGIS Pro project to which the style has to be added.
styleName
Name of a core ArcGIS Pro style or the full path to a style file (.stylx) on disk that has to be added to the current project.
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run
Remarks
The path of style file to be added is case sensitive.
Example
How to add a style to project
//For ArcGIS Pro system styles, just pass in the name of the style to add to the project
await QueuedTask.Run(() => StyleHelper.AddStyle(Project.Current, "3D Vehicles"));

//For custom styles, pass in the full path to the style file on disk
string customStyleToAdd = @"C:\Temp\CustomStyle.stylx";
await QueuedTask.Run(() => StyleHelper.AddStyle(Project.Current, customStyleToAdd));
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also