/// <summary>
/// Creates fieldmapping object with the OBJECTID field to be extracted to be used with GP tools.
/// </summary>
/// <param name="classObj">FeatureClass or table.</param>
/// <param name="newOIDFldName">Name of the object id field in the mapping.</param>
/// <returns></returns>
public static IGPFieldMapping CreateFieldMap(this IClass classObj, string newOIDFldName, bool newOidFldNullable = false, int newOidDefaultVal = -1)
{
IGPFieldMapping fieldmapping = null;
if (classObj is ITable || classObj is IFeatureClass)
{
IGPUtilities gputilities = new GPUtilities();
IDETable inputTableA = (IDETable)gputilities.MakeDataElementFromNameObject((classObj as IDataset).FullName);
IArray inputTables = new ESRI.ArcGIS.esriSystem.Array();
inputTables.Add(inputTableA);
fieldmapping = new GPFieldMapping() as IGPFieldMapping;
fieldmapping.Initialize(inputTables, null);
IFieldEdit2 oidField = new Field() as IFieldEdit2;
oidField.Name_2 = newOIDFldName;
oidField.Type_2 = esriFieldType.esriFieldTypeInteger;
oidField.IsNullable_2 = newOidFldNullable;
oidField.DefaultValue_2 = newOidDefaultVal;
IGPFieldMap orgOIDFldMap = new GPFieldMap {
OutputField = oidField
};
IField OIDFld = classObj.Fields.Field[classObj.FindField(classObj.OIDFieldName)];
orgOIDFldMap.AddInputField(inputTableA, OIDFld, 0, OIDFld.Length);
fieldmapping.AddFieldMap(orgOIDFldMap);
}
return(fieldmapping);
}
public static void SpatialJoin(object targetFC, object joinFC, string outputFcPath, JoinType joinType, string matchOption, IGPFieldMapping fieldMapping = null)
{
var geoprocessor = new Geoprocessor()
{
OverwriteOutput = true,
AddOutputsToMap = false
};
try
{
Delete(outputFcPath);
SpatialJoin spatialJoin = new SpatialJoin
{
join_features = joinFC,
target_features = targetFC,
join_type = joinType.ToString(),
match_option = matchOption,
out_feature_class = outputFcPath,
field_mapping = fieldMapping
};
var result = geoprocessor.Execute(spatialJoin, null);
}
catch (Exception)
{
if (geoprocessor.MessageCount > 0)
{
string excMessage = null;
for (int i = 0; i < geoprocessor.MessageCount; i++)
{
excMessage += geoprocessor.GetMessage(i) + Environment.NewLine;
}
throw new Exception(excMessage);
}
}
}