How to create a field with SDK .NET ?

[LoicDeichelbohrer]

Hello,

I wish to create a new field (column) in the attribute table of a specific layer with the SDK .Net.

It is possible to create a new row (ligne) in the attribute table with createRow(RowBuffer rowbuffer) but a function to create a field don't seem to existe.

I found in the api reference that there was a field class and an attribute class that allow to get information about a field but nothing to actually create one. All the create function that I found allow to create a feature, or a row but not a field.

I also searched in the sample available on github (Esri/arcgis-pro-sdk-community-samples · GitHub ).

Maybe I missed something in the api reference.

Thank you for your help.

[nicogis]

I don't know but if it is missing you can use 'add field' of gp (https://github.com/Esri/arcgis-pro-sdk-community-samples/tree/master/Geoprocessing)

[LoicDeichelbohrer]

When you say gp, are you talking about DriveTimeGP ?

Because there aren't any add field in this project.

[ThomasEmge]

You are not missing anything in the API. The API is designed following the data manipulation language (DML).

In order to add a field you would make a call using geoprocessing such as

using ArcGIS.Desktop.Core.Geoprocessing;
await QueuedTask.Run(() =>
    {
        Geoprocessing.ExecuteToolAsync("AddField_management", Geoprocessing.MakeValueArray("FieldName", "LONG", 9));
    });

[LoicDeichelbohrer]

Thank you but how do you tell this function which attribute table will add the new field ?

And this function use geoprocessing but is it possible to create a field in another way, like the creation of row with createRow() ?

[ThomasEmge]

My mistake,

the first argument is the target table.

using ArcGIS.Desktop.Core.Geoprocessing;  
await QueuedTask.Run(() =>  
    {  
        Geoprocessing.ExecuteToolAsync("AddField_management", Geoprocessing.MakeValueArray(@"c:\temp\demo.gdb\sample", "FieldName", "LONG", 9));  
    }); 

When you are working with layers in your map this would be that way to get the location:

FeatureLayer firstLayer = MapView.Active.Map.Layers.OfType<FeatureLayer>().FirstOrDefault();
await QueuedTask.Run(() =>
{ 
 FeatureClass fc = firstLayer.GetTable() as FeatureClass;
 Datastore ds = fc.GetDatastore();
 string dc = ds.GetConnectionString();
 if (ds is Geodatabase)
 {
  Geodatabase gdb = fc.GetDatastore() as Geodatabase;
  string gdbPath = gdb.GetPath();
 }
 string name = fc.GetName();
});

[ThomasEmge · Accepted solution]

or as it was pointed out to me:

FeatureLayer firstLayer = MapView.Active.Map.Layers.OfType<FeatureLayer>().FirstOrDefault(); 
await QueuedTask.Run(() => 
{ 
   FeatureClass fc = firstLayer.GetTable() as FeatureClass; 
   Geoprocessing.ExecuteToolAsync("AddField_management", Geoprocessing.MakeValueArray(fc, "FieldName", "LONG", 9));
});

[LoicDeichelbohrer]

Thank you very much for your help.

One last thing, where does the string "AddField_management" come from ?

I didn't find anything about it on the api reference or in the DAML.cs that you can generate in code.

[nicogis]

you can use toolboxalias.toolname or toolname_toolboxalias pattern.

The data management toolbox has alias 'management' while the name of tool is 'AddField' (click right button of mouse on tool and select property and see the name)

Here in

https://desktop.arcgis.com/en/desktop/latest/guide-books/extensions/task-assistant-manager/task-assi... you can see the list of alias of toolbox system

[LoicDeichelbohrer]

Thank you