ArcEngine开发中有没有办法将多个polyline变成一个polyline

<P><I>object</I>.<B>Clip</B> <B>(</B><I>clipperEnvelope</I><B> )</B></P>
<P><B>Remarks</B></P>
<P>Note: The other geometry must be an high-level geometry. High-Level geometries are point, multipoint, polyline and polygon. To use it with low-level geometries such as segments (Line, Circular Arc, Elliptic Arc, Bézier Curve), path or ring they must be wrapped into high-level geometries type.<BR>这是帮助里面的原话，我想用一个envelope来对一个路网进行裁剪，图层上是一个一个的</P>
<P>polyline按照上面的注释需要将这些单独的polyline打包。</P>
<P>请教高手！谢谢！</P>

你的polyline 本身就是 high-level geometries type.<BR>，用IgeometryCollection不就可以了嘛

<P>已解决，谢谢</P>