/// <summary>
/// 导出拓扑错误图形， 在指定要素数据集(IFeatureDataset)或工作空间(IWorkspace)新建要素类以保存拓扑错误图形
/// </summary>
/// <param name="topologyRule">拓扑规则</param>
/// <param name="topology">拓扑</param>
/// <param name="resultObject">指定的要素数据集(IFeatureDataset)或工作空间(IWorkspace)，用于创建新要素类，保存拓扑错误图形</param>
public static IFeatureClass TopoErrorToNewFeatureClass(this ITopologyRule topologyRule, ITopology topology, object resultObject, string resultClassName = null)
{
//获得指定拓扑规则类型的拓扑错误要素
var errorFeatures = GetTopoErrorFeatures(topologyRule, topology);
if (errorFeatures.Count < 1)
{
return(null);
}
//创建保存拓扑错误的要素类
var feature = errorFeatures[0] as IFeature;
var geoType = feature.Shape.GeometryType;
if (string.IsNullOrEmpty(resultClassName))
{
resultClassName = topologyRule.TopologyRuleType.ToString();
}
IFeature tmpFeature = errorFeatures[0] as IFeature;
var resultFeatureClass = FeatureClassEx.Create(resultObject, resultClassName,
tmpFeature.Shape.SpatialReference, geoType, new FieldsClass());
//将拓扑错误要素存入要素类中
TopoErrorInsertToFeatureClass(errorFeatures, resultFeatureClass);
return(resultFeatureClass);
}
/// <summary>
/// 将指定路径下的要素图层加载到地图控件中
/// <para>可加载lyr/shp/mdb/gdb/dwg等多种数据源图层，允许的路径形式参考<see cref="FeatureClassEx.FromPath"/>方法</para>
/// </summary>
/// <param name="mapControl">地图控件</param>
/// <param name="layerPath">要素类图层的完整路径，允许的路径形式参考<see cref="FeatureClassEx.FromPath"/>方法</param>
public static void LoadFeatureLayer(this AxMapControl mapControl, string layerPath)
{
if (Path.GetExtension(layerPath) == ".lyr" && File.Exists(layerPath))
{
mapControl.AddLayerFromFile(layerPath);
return;
}
var featureClass = FeatureClassEx.FromPath(layerPath);
mapControl.AddLayer(new FeatureLayerClass {
FeatureClass = featureClass, Name = featureClass.AliasName
});
}
private void Test()
{
double sumRiverLength = 0.0;
FeatureClassEx.FromPath(@"c:\River.shp").QueryFeatures(@"XZQDM = '440000'",
feature => sumRiverLength += feature.ToDouble("RiverLength"));
var workspace = WorkspaceEx.GetWorkSpace(@"c:\World.mdb");
FeatureClassEx.FromPath(@"c:\World.mdb\river").CopyStruct(workspace, "NewRiver", "河流");
var connString = DbHelper.Dbf_OleDb4(@"c:\River.dbf");
var dbHelper = DbHelper.GetOleDbHelper(connString).ExcNonQuery(@"update River set Name = 'Pearl River' where RiverCode ='003'");
}
/// <summary>
/// 检查多个路径下的要素类的坐标系是否完全一致
/// </summary>
/// <param name="paths"></param>
/// <returns>若坐标系不一致则返回提示信息，一致则返回null</returns>
public static string CheckCoordinates(params string[] paths)
{
var classes = new List <IFeatureClass>();
foreach (var path in paths)
{
var featureClass = FeatureClassEx.FromPath(path);
if (featureClass != null)
{
classes.Add(featureClass);
}
}
return(SpatialRefOpt.CheckSpatialRef(classes, out var message) ? message : null);
}
/// <summary>
/// 检查路径下的要素类是否被占用
/// </summary>
/// <param name="path">要素类的完整路径，参考<see cref="FeatureClassEx.FromPath"/></param>
/// <param name="autoAddExtension">是否自动在路径末尾增加.shp/.mdb/.dwg后缀，以再次查找要素类</param>
/// <returns>若要素类被锁定则返回提示信息，要素类不存在或未锁定返回null，若检查失败抛出异常</returns>
public static string CheckClassLock(string path, bool autoAddExtension = false)
{
try
{
var featureClass = FeatureClassEx.FromPath(path, autoAddExtension);
if (featureClass == null)
{
return(null);
}
featureClass.CheckClassLock(out var message);
return(message);
}
catch (Exception ex) { throw new Exception($"打开或检查要素类是否锁定失败：{ex.Message}\r\n请检查要素类路径“{path}”无误", ex); }
}
/// <summary>
/// 将指定路径下的要素数据源数据，加载到地图控件中
/// <para>可加载lyr/shp/mdb/gdb/dwg等多种数据源数据，允许的路径形式参考<see cref="FeatureClassEx.AllFromPath"/>方法</para>
/// </summary>
/// <param name="mapControl">地图控件</param>
/// <param name="connStrOrPath">要素数据源路径，允许的路径形式参考<see cref="FeatureClassEx.AllFromPath(string)"/>方法</param>
public static void LoadFeatureLayers(this AxMapControl mapControl, string connStrOrPath)
{
if (Path.GetExtension(connStrOrPath) == ".lyr" && File.Exists(connStrOrPath))
{
mapControl.AddLayerFromFile(connStrOrPath);
return;
}
var featureClasses = FeatureClassEx.AllFromPath(connStrOrPath);
foreach (var featureClass in featureClasses)
{
mapControl.AddLayer(new FeatureLayerClass {
FeatureClass = featureClass, Name = featureClass.AliasName
});
}
}
/// <summary>
/// 设置地图显示范围
/// </summary>
/// <param name="map">地图</param>
/// <param name="mapFrameInfo">地图框信息</param>
protected virtual void SetMapExtent(IMap map, MapFrameInfo mapFrameInfo)
{
//若MapExtent不为null，则地图缩放至MapExtent指定的范围；否则查找LayerInfo.ZoomTo为True的图层来定位缩放
var activeView = map as IActiveView;
if (mapFrameInfo.MapExtent != null)
{
activeView.MapZoomTo(mapFrameInfo.MapExtent, 1.3);
}
else
{
var layerInfo = mapFrameInfo.LayerInfos.FirstOrDefault(v => v.ZoomTo);
if (layerInfo != null)
{
var featureClass = FeatureClassEx.FromPath(layerInfo.DataSource);
var geometries = featureClass.QueryGeometries(layerInfo.Definition);
activeView.MapZoomTo(geometries, 1.3);
}
}
}
/// <summary>
/// 将指定要素类复制到工作空间中
/// </summary>
/// <param name="workspace"></param>
/// <param name="sourceClass">源要素类</param>
/// <param name="targetClassName">新要素类名称，若为null则使用源要素类名称</param>
/// <param name="whereClause">筛选条件，从源要素类中筛选指定的要素复制到目标要素，为null或Empty时将复制全部要素</param>
/// <returns></returns>
public static IFeatureClass CreateFeatureClass(this IWorkspace workspace, IFeatureClass sourceClass, string targetClassName = null, string whereClause = null)
{
return(FeatureClassEx.CopyDataTo(sourceClass, workspace, targetClassName, whereClause));
}
/// <summary>
/// 创建要素类
/// </summary>
/// <param name="name">要素类名称（如果为shapefile,不能包含文件扩展名".shp"）</param>
/// <param name="sptialRef">空间参考坐标系。若参数obj为IFeatureDataset则应赋值为null；否则不能为null，
/// 可使用<see cref="SpatialRefOpt.CreateSpatialRef(esriSRProjCS4Type)"/>或其重载方法进行创建</param>
/// <param name="geometryType">几何类型（点/线/面等）</param>
/// <param name="fields">要创建的字段集（可以为null，该方法自动修改或加入OID和SHAPE字段以确保几何类型、坐标系与参数一致）</param>
/// <returns></returns>
public static IFeatureClass CreateFeatureClass(this IWorkspace workspace, string name, ISpatialReference sptialRef, esriGeometryType geometryType, IFields fields = null)
{
return(FeatureClassEx.Create(workspace, name, sptialRef, geometryType, fields));
}
/// <summary>
/// 创建要素类
/// </summary>
/// <param name="obj">IWorkspace、IFeatureWorkspace或IFeatureDataset对象，在该对象中创建要素类</param>
/// <param name="name">要素类名称（如果为shapefile,不能包含文件扩展名".shp"）</param>
/// <param name="fields">要创建的字段集（必须包含SHAPE字段），可参考<see cref="FieldOpt.CreateBaseFields"/>等方法创建字段集</param>
/// <returns></returns>
public static IFeatureClass CreateFeatureClass(this IWorkspace workspace, string name, IFields fields)
{
return(FeatureClassEx.Create(workspace, name, fields));
}
/// <summary>
/// 多边形转点，将多边形要素类每个图斑的中心（重心）点存入新的点要素类中
/// </summary>
/// <param name="sourceClassPath"></param>
/// <param name="targeClassPath"></param>
/// <returns></returns>
public static IFeatureClass PolygonClassToPoint(string sourceClassPath, string targeClassPath)
{
var sourceClass = FeatureClassEx.FromPath(sourceClassPath);
return(sourceClass.PolygonClassToPoint(targeClassPath));
}