IGeometry转WKT

转换需要用到一个叫NetTopologySuite的插件，github地址。下载编译好的版本引入到项目中，然后using NetTopologySuite.IO即可。

        public static string ConvertGeometryToWKT(IGeometry geometry){byte[] b = ConvertGeometryToWKB(geometry);WKBReader reader = new WKBReader();GeoAPI.Geometries.IGeometry g = reader.Read(b);WKTWriter writer = new WKTWriter();return writer.Write(g);}public static byte[] ConvertGeometryToWKB(IGeometry geometry){IGeometryFactory3 factory = new GeometryEnvironment() as IGeometryFactory3;byte[] b = factory.CreateWkbVariantFromGeometry(geometry) as byte[];return b;}

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