ArcGIS Pro二次开发添加字段

private async Task<bool> ExecuteAddFieldTool(BasicFeatureLayer theLayer, KeyValuePair<string, string> field, string fieldType, int? fieldLength = null, bool isNullable = true)
        {
            try
            {
                return await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
                {
                    var inTable = theLayer.Name;
                    var table = theLayer.GetTable();
                    var dataStore = table.GetDatastore();
                    var workspaceNameDef = dataStore.GetConnectionString();
                    var workspaceName = workspaceNameDef.Split('=')[1];
                    
                    var fullSpec = System.IO.Path.Combine(workspaceName, inTable);
                    System.Diagnostics.Debug.WriteLine($@"Add {field.Key} from {fullSpec}");

                    var parameters = Geoprocessing.MakeValueArray(fullSpec, field.Key, fieldType.ToUpper(), null, null,
                        fieldLength, field.Value, isNullable ? "NULABLE" : "NON_NULLABLE");
                    var cts = new CancellationTokenSource();
                    var results = Geoprocessing.ExecuteToolAsync("management.AddField", parameters, null, cts.Token,
                        (eventName, o) =>
                        {
                            System.Diagnostics.Debug.WriteLine($@"GP event: {eventName}");
                        });
                    return true;
                });
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
                return false;
            }
        }