How do you write to a feature layer's field?

tzz_12

I know how to create a new field in an existing feature class, but if I have a list of calculated outputs, how do I write those outputs in the new fields? Can I use the index of the feature class's table to write the values row by row using the common index? Is there a community sample that you recommend? 

Thanks everyone!

kenbuja

Using a cursor, this is how I calculated the field "PS_Count" in the FeatureClass "featureClass" to 1.

QueryFilter queryFilter = new() { WhereClause = "1=1" };
EditOperation editOperation = new();
await QueuedTask.Run(() =>
{
  using RowCursor rowCursor = featureClass.Search(queryFilter, false);
  while (rowCursor.MoveNext())
  {
    using Row record = rowCursor.Current;
    editOperation.Modify(record, "PS_Count", 1);
  }
});
if (!await editOperation.ExecuteAsync()) MessageBox.Show(editOperation.ErrorMessage);

 

The other way you can do this is with the GeoProcessing Tool

IGPResult GPResult = await CalculateFeatures(featureClass, "PS_Count", "1", "ARCADE", null, "LONG", GPExecuteToolFlags.AddToHistory);
if (GPResult.IsFailed)
{
  MessageBox.Show("Failed to calculate Count field");
}

public static async Task<IGPResult> CalculateFeatures(FeatureClass InFC, string FieldName, string exp, string exp_type, string code_block, string fieldtype, GPExecuteToolFlags flags)
{
  List<object> arguments = new() {
    InFC, //In Table
    FieldName, //Field
    exp, //Expression
    exp_type, //Expression Type
    code_block, //Code Block,
    fieldtype, //Field Type
  };
  IGPResult result = await Geoprocessing.ExecuteToolAsync("management.CalculateField", Geoprocessing.MakeValueArray(arguments.ToArray()), null, null, null, flags);
  return result;
}