ESRI.ArcGIS.Analyst3DTools.Idw参数该如何填写

<P> ESRI.ArcGIS.Analyst3DTools.Idw</P>
<P> public Idw(object in_point_features, object z_field, object out_raster)</P>
<P>Idw idw=  Idw(object in_point_features, object z_field, object out_raster)<BR></P>
<P>里面的参数该如何填写,谢谢</P>