GPPointFileInfo\ESOutputCoordinateSystem.cs
Creating a non-trival custom GP tool - inputs, outputs, and responding to environment settings
GPPointFileInfo\ESOutputCoordinateSystem.cs
// Copyright 2008 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See use restrictions at <your ArcGIS install location>/developerkit/userestrictions.txt.
// 

using ESRI.ArcGIS.Geoprocessing;
using ESRI.ArcGIS.Geodatabase;

namespace GPPointFileInfo
{
    public class ESOutputCoordinateSystem : GPPointFileInfo.IESOutputCoordinateSystem
    {
        private const string _EnvironmentName = "outputCoordinateSystem";
        private ESRI.ArcGIS.Geometry.ISpatialReference _spatialReference;

        public ESOutputCoordinateSystem(IGPEnvironmentManager gpEnvironmentManager)
        {
            IGPValue gpValue = gpEnvironmentManager.GetGPValue(_EnvironmentName);

            _spatialReference = GetSpatialReference(gpValue);
        }

        public ESRI.ArcGIS.Geometry.ISpatialReference SpatialReference
        {
            get
            {
                return _spatialReference;
            }
        }

        private ESRI.ArcGIS.Geometry.ISpatialReference GetSpatialReference(IGPValue gpValue)
        {
            ESRI.ArcGIS.Geometry.ISpatialReference spatialReference;

            IGPCoordinateSystem gpCoordinateSystem = gpValue as IGPCoordinateSystem;

            spatialReference = gpCoordinateSystem.SpatialReference;

            return spatialReference;
        }
    }
}