兩點畫一條線

ISegmentCollection pPath = new PathClass(); 
    object o = Type.Missing; 
    IPoint startPoint = null;//起始點 
    foreach (DataRow dr2 in dt2.Rows) 
    { 
        if (startPoint == null) 
        { 
            startPoint = ConstructPoint(Convert.ToDouble(dr2["經度"]), Convert.ToDouble(dr2["緯度"])); 
        } 
        else 
        { 
            IPoint endPoint = ConstructPoint(Convert.ToDouble(dr2["經度"]), Convert.ToDouble(dr2["緯度"]));//終止點 
            ILine pLine = new LineClass(); 
            pLine.FromPoint = startPoint; 
            pLine.ToPoint = endPoint; 
            //pLine.PutCoords(startPoint, endPoint); 
            pPath.AddSegment(pLine as ISegment, ref o, ref o); 
            startPoint = endPoint; 
        } 
    } 
 
    IGeometryCollection pPolyline = new PolylineClass(); 
    pPolyline.AddGeometry(pPath as IGeometry, ref o, ref o); 
 
    ISimpleLineSymbol lineSymbol = new SimpleLineSymbolClass(); 
    lineSymbol.Color = GetColor(colorValue);//顏色 
    lineSymbol.Style = esriSimpleLineStyle.esriSLSInsideFrame; //樣式 
    lineSymbol.Width = 2; 
 
    ILineElement pLineElement = new LineElementClass(); 
    pLineElement.Symbol = lineSymbol; 
 
    IElement pElement = pLineElement as IElement; 
    tempGeometry = pElement.Geometry = pPolyline as IGeometry; 
    pGraphicsContainer.AddElement(pElement, 0);