ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / LayerDocument Class / AsJson Method
Example Version

AsJson Method
Create a json encoding for the ArcGIS.Core.CIM.CIMLayerDocument and its current state. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public string AsJson()

Return Value

A json encoded string.
Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Example
Create layer from a lyrx file
var lyrDocFromLyrxFile = new LayerDocument(@"d:\data\cities.lyrx");
var cimLyrDoc = lyrDocFromLyrxFile.GetCIMLayerDocument();

//modifying its renderer symbol to red
var r = ((CIMFeatureLayer)cimLyrDoc.LayerDefinitions[0]).Renderer as CIMSimpleRenderer;
r.Symbol.Symbol.SetColor(new CIMRGBColor() { R = 255 });

//optionally save the updates out as a file
lyrDocFromLyrxFile.Save(@"c:\data\cities_red.lyrx");

//get a json representation of the layer document and you want store away...
var aJSONString = lyrDocFromLyrxFile.AsJson();

//... and load it back when needed
lyrDocFromLyrxFile.Load(aJSONString);
cimLyrDoc = lyrDocFromLyrxFile.GetCIMLayerDocument();

//create a layer and add it to a map
var lcp = new LayerCreationParams(cimLyrDoc);
var lyr = LayerFactory.Instance.CreateLayer<FeatureLayer>(lcp, map);
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also