topic Conversion of Field Type to Double in ArcGIS Pro SDK Questions

Conversion of Field Type to Double

tzz_12 — Thu, 13 Apr 2023 01:20:05 GMT

I am getting the error "System.InvalidCastException:'Unable to cast object of type 'ArcGIS.Core.Data.Field' to type 'System.IConvertible'. I am pretty sure this worked for me before, but I got this error when I applied it to the "Shape_Area" field. If anyone encountered the same problem, how did you resolve it? Thanks!

Field areaField = modelSoilsDef.GetFields().FirstOrDefault(x => x.Name.Contains("Shape_Area")); var Area = Convert.ToDouble(areaField);

Re: Conversion of Field Type to Double

GKmieliauskas — Thu, 13 Apr 2023 06:20:27 GMT

Hi,

First, you don't need use Linq to find field.

Field areaField = modelSoilsDef.FindField("Shape_Area");

To find spatial fields like area or length don't use strings like "Shape_Area". Name of spatial field could depend on database type. Use ArcGIS Pro SDK for these fields:

string areaFieldName = modelSoilsDef.GetAreaField();

And the last thing. As I understand you want to read row value of field "Shape_Area". Your code could look like this:

var Area = Convert.ToDouble(row[modelSoilsDef.GetAreaField()]);

If you want to read more than one row:

string areaFieldName = modelSoilsDef.GetAreaField(); // inside row cursor var Area = Convert.ToDouble(row[areaFieldName]);

Re: Conversion of Field Type to Double

tzz_12 — Thu, 13 Apr 2023 16:59:05 GMT

Thank you for your detailed solution.