版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/wangtao510/article/details/53744997
private static IMap wgs84Map=null;
public static double getDis(IPoint p1,IPoint p2)
{
wgs84Map=new Map();
ISpatialReferenceFactory pF=new SpatialReferencEnvironment();
IGeograohicCoordinateSystem pG=pF.CreateGeograohicCoordinateSystem((int)esriSRGeoType.esriSRGeoCS_1984);
wgs84Map.SpatialReference=pG;
wgs84Map.MapUnits=esriUnits.esriDecimalDegrees;
wgs84Map.DistanceUnits=esriUnits.esriKilometers;
return wgs84Map.ComputeDistance(p1,p2);
}