ArcGIS Pro删除一个字段

 private async Task<bool> ExecuteDeleteFieldTool(BasicFeatureLayer theLayer, string fieldName)
        {
            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($@"Delete {fieldName} from {fullSpec}");

                    var parameters = Geoprocessing.MakeValueArray(fullSpec, fieldName);
                    var cts = new CancellationTokenSource();
                    var results = Geoprocessing.ExecuteToolAsync("management.DeleteField", parameters, null, cts.Token,
                        (eventName, o) =>
                        {
                            System.Diagnostics.Debug.WriteLine($@"GP event: {eventName}");
                            if (eventName == "OnMessage")
                            {

                                System.Diagnostics.Debug.WriteLine($@"Msg: {o}");
                            }
                        });
                    return true;

                });
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
                return false;
            }
        }