/// <summary>
/// 执行属性查询
/// 以及进度条的显示
/// </summary>
private void ExecuteIdentify(List <LayerFilterProperties> searchLayers, IGeometry identifyGeom)
{
object Missing = Type.Missing;
//清空以前所有的查询结果先
identifiedResultsList.Clear();
//用于计算查询得到的要素的数量
int identifiedObjCount = 0;
//获取用于查询的图层的数量--列表中的数量
int searchLayersCount = searchLayers.Count;
//初始化进度条
IdentifyProgress.Visible = true;
IdentifyProgress.Maximum = searchLayersCount;
//初始化闪烁对象
flashObjects.MapControl = associateMapControl.Object as IMapControl2;
flashObjects.Init();
//遍历所有图层
for (int i = 0; i < searchLayersCount; i++)
{
LayerFilterProperties filterProps = searchLayers[i];
ILayer layer = filterProps.TargetLayer;
//新建查询结果列表对象
LayerIdentifiedResult layerIdentifiedResult = new LayerIdentifiedResult();
//先保存查询图层对象
layerIdentifiedResult.IdentifyLayer = layer;
layerIdentifiedResult.GeometryType = filterProps.LayerFeatureType;
//首先获得查询结果列表对象，以备后面往里添加结果使用
List <IFeatureIdentifyObj> identifiedObjList = layerIdentifiedResult.IdentifiedFeatureObjList;
//执行查询，返回查询结果
IArray identifyResult = Identify(layer, identifyGeom);
//处理异常情况
if (identifyResult != null)
{
//依次获取每一个查询结果对象
for (int k = 0; k < identifyResult.Count; k++)
{
identifiedObjCount++;
IFeatureIdentifyObj identifiedFeatureObj = identifyResult.get_Element(k) as IFeatureIdentifyObj;
//闪烁要素
IFeature identifiedFeature = (identifiedFeatureObj as IRowIdentifyObject).Row as IFeature;
//添加到闪烁图形
flashObjects.AddGeometry(identifiedFeature.Shape);
//保存查询结果
identifiedObjList.Add(identifiedFeatureObj);
}
identifiedResultsList.Add(layerIdentifiedResult);
}
//显示查询进度
IdentifyProgress.Value = i + 1;
Application.DoEvents();
}
//隐藏进度条
IdentifyProgress.Visible = false;
//显示查询到的要素数量
lblFeatureCount.Text = "查询到 " + identifiedObjCount + " 条记录";
}
/// <summary>
/// 点击以后显示节点的信息--同时闪烁图层
/// </summary>
private void ShowClickedNodeInfo(TreeNode nodeClicked, bool doFlash)
{
if (nodeClicked == null)
{
//初始化树型显示窗口
InitializeAttributesList();
return;
}
//获取点击点对应的要素
int nodeLevel = nodeClicked.Level;
//获取点击的是图层还是图层下的要素
//若featureIndex < 0则表示点击的是图层,闪烁图层下选中的所有要素
//反之，则表示点击的是图层下的要素，获取图层索引和要素索引，
//用于在结果列表中安索引获取要素或要素集属性
int layerIndex = -1; int featureIndex = -1;
if (nodeLevel > 0)
{
TreeNode parentNode = nodeClicked.Parent;
layerIndex = parentNode.Index;
featureIndex = nodeClicked.Index;
}
else
{
layerIndex = nodeClicked.Index;
}
//获取对应要素
LayerIdentifiedResult layerResult = identifiedResultsList[layerIndex];
//点击了图层下的要素
if (featureIndex > -1)
{
IFeatureIdentifyObj identifyObjDefault = layerResult.IdentifiedFeatureObjList[featureIndex];
IFeature featureDefault = (identifyObjDefault as IRowIdentifyObject).Row as IFeature;
//显示属性
ShowFeatureAttributes(featureDefault);
//判断是否闪烁要素
if (doFlash)
{
(identifyObjDefault as IIdentifyObj).Flash(associateMapControl.ActiveView.ScreenDisplay);
}
}
//点击了图层，同时闪烁图层下的所有要素图形
else
{
flashObjects.FlashObjects(layerResult);
}
}
public void FlashObjects(LayerIdentifiedResult layerFlash)
{
screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache);
switch (layerFlash.GeometryType)
{
case LayerFeatureType.Point:
screenDisplay.SetSymbol(pointSymbol);
break;
case LayerFeatureType.Polyline:
screenDisplay.SetSymbol(lineSymbol);
break;
case LayerFeatureType.Polygon:
screenDisplay.SetSymbol(regionSymbol);
break;
default:
return;
}
//IFeatureIdentifyObj.Feature属性是只写的，所以要转换为IRowIdentifyObject接口，使用Row属性获取Feature
List <IFeatureIdentifyObj> identifyObjDefault = layerFlash.IdentifiedFeatureObjList;
for (int i = 0; i < identifyObjDefault.Count; i++)
{
IFeature featureDefault = (identifyObjDefault[i] as IRowIdentifyObject).Row as IFeature;
switch (layerFlash.GeometryType)
{
case LayerFeatureType.Point:
screenDisplay.DrawPoint(featureDefault.Shape);
break;
case LayerFeatureType.Polyline:
screenDisplay.DrawPolyline(featureDefault.Shape);
break;
case LayerFeatureType.Polygon:
screenDisplay.DrawPolygon(featureDefault.Shape);
break;
}
}
Thread.Sleep(500);
screenDisplay.FinishDrawing();
mapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);
}
/// <summary>
/// 在右侧表格中显示查询结果
/// </summary>
private void DisplayIdentifyResults()
{
//清空以前所有显示结果
trvDataList.Nodes.Clear();
//初始化属性显示窗口数据
lstProperties.Items.Clear();
lstProperties.Columns.Clear();
//声明变量
List <IFeatureIdentifyObj> IdentifyObjs = null;
IFeatureIdentifyObj IdentifyObj = null;
//列出查询结果
int resultsCount = identifiedResultsList.Count;
for (int i = 0; i < resultsCount; i++)
{
LayerIdentifiedResult layerIdentifiedResult = identifiedResultsList[i];
//添加图层节点
TreeNode layerNode = trvDataList.Nodes.Add(layerIdentifiedResult.IdentifyLayer.Name);
//添加要素节点
IdentifyObjs = layerIdentifiedResult.IdentifiedFeatureObjList;
for (int k = 0; k < IdentifyObjs.Count; k++)
{
IdentifyObj = IdentifyObjs[k];
IRowIdentifyObject rowIdentifyObj = IdentifyObj as IRowIdentifyObject;
IFeature identifyFeature = rowIdentifyObj.Row as IFeature;
layerNode.Nodes.Add(identifyFeature.OID.ToString());
}
}
//展开所有节点
trvDataList.ExpandAll();
//默认显示第一图层的第一个查询要素
if (trvDataList.Nodes.Count < 1)
{
ShowClickedNodeInfo(null, false);
}
//显示第一图层的第一个查询要素
else
{
TreeNode topNode = trvDataList.Nodes[0].Nodes[0];
//显示第一节点
trvDataList.TopNode = topNode.Parent;
ShowClickedNodeInfo(topNode, false);
}
}