Hi Mike,I was doing something similar to your sample app. But the difference is that I'm working with pre-existing graphics with pre-existing attributes, while you were creating a new graphic and adding a new field.I got this to work well now, which is a big progress:
var featureSet = new FeatureSet();
var layer = GetSelectedInputLayer();
featureSet.Fields = new List<Field>((layer as FeatureLayer).LayerInfo.Fields);
foreach (var graphic in layer.SelectedGraphics)
{
featureSet.Features.Add(graphic);
}
parameters.Add(new GPFeatureRecordSetLayer("InputFeatures", featureSet));
parameters.Add(new GPLinearUnit("Distance", esriUnits.esriMeters, Convert.ToDouble(distanceText.Text)));
The problem now is that this only works with Feature Layers that have a LayerInfo value. I want this to work with a regular GraphicsLayer too, and the list of fields is not known to me ahead of time.I wrote the following helper methods that will return the list of Fields for any layer:public static ICollection<Field> GetFields(Graphic graphic)
{
var fields = new List<Field>();
foreach (var attribute in graphic.Attributes.Keys)
{
fields.Add(new Field()
{
FieldName = attribute, Type = Field.FieldType.Unknown, Alias = attribute
});
}
return fields;
}
public static ICollection<Field> GetFields(Layer layer)
{
if (layer is FeatureLayer)
{
var featureLayer = layer as FeatureLayer;
if (featureLayer.LayerInfo != null)
{
return featureLayer.LayerInfo.Fields;
}
else if (featureLayer.Graphics.Count > 0)
{
return GetFields(featureLayer.Graphics[0]);
}
}
else if (layer is GraphicsLayer)
{
var graphicsLayer = layer as GraphicsLayer;
if (graphicsLayer.Graphics.Count > 0)
{
return GetFields(graphicsLayer.Graphics[0]);
}
}
return new List<Field>();
}So basically I'm looping through the attributes of the first Graphic and retrieving the Fields this way. But when I pass this collection of fields to the geoprocessor, it fails. It's obvious that the fields are causing the failure because if I don't specify the Fields property of the FeatureSet, the geoprocessor succeeds.Is there a more accurate way of getting a list of fields/attributes from non-feature layers like Graphics layers?Thanks!
