IMap pMap;

IPoint pPoint;

pMap = axMapControl1.Map;

pPoint = axMapControl1.ToMapPoint(e.x, e.y);

IIdentify pIdentify;

pIdentify = (IIdentify)pMap.get_Layer();

IArray pIDArray;

IFeatureIdentifyObj pFeatIdObj;

IIdentifyObj pIdObj;

//点选

IEnvelope pEnv=new EnvelopeClass();

pEnv =axMapControl1.ActiveView.Extent;

pEnv.Height= ;

pEnv.Width  = ;

pEnv.CenterAt(pPoint);

pIDArray = pIdentify.Identify(pEnv);

//矩形选择

 //IEnvelope testIRectangleElement;

//testIRectangleElement = axMapControl1.TrackRectangle();

//pIDArray = pIdentify.Identify(testIRectangleElement);

//i = pIDArray.Count;

if (pIDArray != null)

{

    for (int i = ; i <= pIDArray.Count; i++)

    {

        pFeatIdObj = (IFeatureIdentifyObj)pIDArray.get_Element(i);

        pIdObj = (IIdentifyObj)pFeatIdObj;

        pIdObj.Flash(axMapControl1.ActiveView.ScreenDisplay);

        //消息显示查询目标的信息

        MessageBox.Show("Layer:" + pIdObj.Layer.Name + "Feature:" + pIdObj.Name);

    }

}

else

{

    MessageBox.Show("No feature identified.");

}

}