Call AddFields_management from c#

RehmSoftware

Hey,

I'm trying to call AddFields_management via the Geoprocessing.ExecuteToolAsync function. And while I get other python tools working flawlessly I have a hard time adding multiple fields via AddFields_management. My main issue is how to pass the field description parameter which is a nested list in python. I tried jagged arrays, nested List<> but nothing worked.

So given the "official" example..

import arcpy

arcpy.env.workspace = "C:/data/district.gdb"

arcpy.management.AddFields('school', [['school_name', 'TEXT', 'Name', 255, 'Hello world'], ['street_number', 'LONG', 'Street Number', None, 35]])

How would that look in C#?

Thanks in advance & Best regards

Christian

NarelleChedzey

Hi Christian, 

Generally if I have a problem working out the structure of GP parameters I find it useful to run the tool within ArcGIS Pro and then find the geoprocessing history, hover over the tool I just ran and see what the popup shows me in terms of parameters.

This is what I got when I ran the Add Fields routine  (adding a field1 of type long with alias 'field1'  and field2 of type text with field length of 255 and default value of 'MyDefaultValue'

this would then translate into .NET as the following

await QueuedTask.Run(async () =>
{
    var testLines = @C:\data\SampleGDB.gdb\test_lines;

    // set up the arguments
    var fields = "field1 long field1 # #;field2 Text # 255 myDefaultValue";

    var args = Geoprocessing.MakeValueArray(testLines, fields);

    // run the tool

    var result = await Geoprocessing.ExecuteToolAsync("management.AddFields", args);
});

Hope this helps

Narelle