Engine中如何实现ArcMap中的Transformations功能？

【解决办法】：
将IMap转为IMapGeographicTransformations接口，然后通过IMapGeographicTransformations.GeographicTransformations获取IGeoTransformationOperationSet，通过IGeoTransformationOperationSet.Set将自定义的IGeoTransformation添加进去，然后将该mxd保存之后在ArcMap中打开就已经进行动态投影了。
测试代码：

ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();

            ISpatialReference spatialReference = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);

            spatialReference.SetFalseOriginAndUnits(-80.0000000232831, 39.9999999767169, 42949672.9);        

            //Destination spatial reference

            IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1927UTM_19N);

            //Define the XYDomain equivalent to SetFalseOriginAndUnits

            projectedCoordinateSystem.SetDomain(500000, 600000, 5300000, 5600000);

            //Create a Geotransformation (Datum transformation)

            IGeoTransformation geoTransformation = spatialReferenceFactory.CreateGeoTransformation((int)esriSRGeoTransformationType.esriSRGeoTransformation_NAD1927_To_WGS1984_12) as IGeoTransformation;

            IMapDocument mapDocument = new MapDocumentClass();



            string filepath = @C:\Users\Administrator\Desktop\mxd\无标题1.mxd;

            mapDocument.Open(filepath);

            

            IMap map = axMapControl1.Map;

            IMapGeographicTransformations mapGeographicTrans = map as IMapGeographicTransformations;

            IGeoTransformationOperationSet geoTrans = mapGeographicTrans.GeographicTransformations;

            geoTrans.Set(esriTransformDirection.esriTransformReverse, geoTransformation);

            IMxdContents mxd = axMapControl1.Map as IMxdContents;

            mapDocument.ReplaceContents(mxd);

            mapDocument.Save(true, false);