/// <summary>
/// 加载地图窗口中的图层
/// </summary>
private void DisplayLayersFromMapControl()
{
IMap map = associateMapControl.Map;
if (map.LayerCount < 1)
{
return;
}
//获取指定类型图层
UID uid = new UIDClass();
//表示搜索的是IDataLayer
uid.Value = "{6CA416B1-E160-11D2-9F4E-00C04F6BC78E}";
//布尔参数表示要搜索GroupLayer中的图层
IEnumLayer layers = map.get_Layers(uid, true);
layers.Reset(); ILayer layer = layers.Next();
while (layer != null)
{
LayerFilterProperties layerProperty = new LayerFilterProperties();
//layerProperty.HeaderImage = null;
layerProperty.LayerCategory = string.Empty;
layerProperty.LayerFilterName = layer.Name;
layerProperty.LayerFeatureType = GetLayerFeatureType(layer);
layerProperty.TargetLayer = layer;
//保存引用
layerFilterSet.Add(layerProperty);
layer = layers.Next();
}
//释放Com对象
System.Runtime.InteropServices.Marshal.ReleaseComObject(layers);
}
/// <summary>
/// 执行属性查询
/// 尚未实现如何闪烁选中要素集合
/// 以及进度条的显示
/// </summary>
/// <param name="searchLayers"></param>
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
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>
/// 根据用户选择的下拉框获取需要进行查询的图层
/// </summary>
/// <returns></returns>
private List <LayerFilterProperties> SearchIdentifyLayers()
{
List <LayerFilterProperties> IdentifyLayers = null;
//获取过滤文本
string identifyFilter = cboLayerFilter.Text.Trim();
//获取选择的过滤器序号
int selectedIndex = cboLayerFilter.SelectedIndex;
if (selectedIndex >= layerFilterSet.Count)
{
MessageBox.Show("找不到过滤图层。");
return(IdentifyLayers);
}
//获取对应的图层对象
LayerFilterProperties layerProps = layerFilterSet[selectedIndex];
switch (layerProps.LayerFilterName)
{
case AllLayers:
IdentifyLayers = getAllLayers;
break;
case SelectableLayers:
IdentifyLayers = getSelectableLayers;
break;
case VisibleLayers:
IdentifyLayers = getVisibleLayers;
break;
case TopMostLayer:
LayerFilterProperties layerProp = getTopmostLayer;
if (layerProp != null)
{
IdentifyLayers = new List <LayerFilterProperties>();
IdentifyLayers.Add(getTopmostLayer);
}
break;
default:
IdentifyLayers = new List <LayerFilterProperties>();
IdentifyLayers.Add(getTargetLayer);
break;
}
return(IdentifyLayers);
}
/// <summary>
/// 初始化默认图层过滤器
/// </summary>
private void InitializeBasicLayerFilters()
{
//添加默认过滤器
//最顶图层
LayerFilterProperties topMostLayerProperty = new LayerFilterProperties();
//topMostLayerProperty.HeaderImage = null;
topMostLayerProperty.LayerCategory = string.Empty;
topMostLayerProperty.LayerFeatureType = LayerFeatureType.None;
topMostLayerProperty.LayerFilterName = TopMostLayer;
topMostLayerProperty.TargetLayer = null;
//topMostLayerProperty.MapWindow = associateMapWindow;
//可见图层
LayerFilterProperties visibleLayerProperty = new LayerFilterProperties();
//visibleLayerProperty.HeaderImage = null;
visibleLayerProperty.LayerCategory = string.Empty;
visibleLayerProperty.LayerFeatureType = LayerFeatureType.None;
visibleLayerProperty.LayerFilterName = VisibleLayers;
visibleLayerProperty.TargetLayer = null;
//visibleLayerProperty.MapWindow = associateMapWindow;
//可选图层
LayerFilterProperties selectableLayerProperty = new LayerFilterProperties();
//selectableLayerProperty.HeaderImage = null;
selectableLayerProperty.LayerCategory = string.Empty;
selectableLayerProperty.LayerFeatureType = LayerFeatureType.None;
selectableLayerProperty.LayerFilterName = SelectableLayers;
selectableLayerProperty.TargetLayer = null;
//selectableLayerProperty.MapWindow = associateMapWindow;
//所有图层
LayerFilterProperties allLayerProperty = new LayerFilterProperties();
//allLayerProperty.HeaderImage = null;
allLayerProperty.LayerCategory = string.Empty;
allLayerProperty.LayerFeatureType = LayerFeatureType.None;
allLayerProperty.LayerFilterName = AllLayers;
allLayerProperty.TargetLayer = null;
//allLayerProperty.MapWindow = associateMapWindow;
//保存图层引用
layerFilterSet.Add(topMostLayerProperty);
layerFilterSet.Add(visibleLayerProperty);
layerFilterSet.Add(selectableLayerProperty);
layerFilterSet.Add(allLayerProperty);
}
/// <summary>
/// 将图层过滤器添加到下拉框
/// 注意过滤器的显示顺序尚未实现
/// </summary>
private void DisplayLayerFilters()
{
//保存清空前的选中状态
int selectedIndex = cboLayerFilter.SelectedIndex;
if (selectedIndex < 0)
{
selectedIndex = 0;
}
//清空先
cboLayerFilter.Items.Clear();
int filterCount = layerFilterSet.Count;
//加载所有图层过滤条件
for (int i = 0; i < filterCount; i++)
{
LayerFilterProperties filterItem = layerFilterSet[i];
cboLayerFilter.Items.Add(filterItem.LayerFilterName);
}
//设定默认过滤条件
cboLayerFilter.SelectedIndex = selectedIndex;
}