C# arcengine 如何删除要素类
时间: 2024-09-28 08:13:48 浏览: 67
在ArcGIS Engine中使用C#进行要素类的删除通常涉及到以下几个步骤:
1. 加载要素类:首先,你需要通过`IFeatureClass`接口从工作空间中加载你要操作的要素类。例如:
```csharp
IFeatureClass featureClass = (IFeatureClass)Factory.CreateFeatureClass("路径", "MyWorkspace", "MyFeatureClass");
```
这里假设`"路径"`是要素类的别名,`"MyWorkspace"`是工作空间名称,`"MyFeatureClass"`是要素类名称。
2. 删除要素类:使用`IFeatureClass`的`Delete_management`方法,该方法需要一个布尔值参数`deleteDescendants`表示是否同时删除包含的对象(如果有的话)。例如:
```csharp
Delete_management(featureClass, false);
```
`false`表示只删除当前层的元素,`true`则会递归删除所有从这个要素类派生出的子类。
3. 销毁引用:最后,记得关闭和释放`IFeatureClass`的引用,以释放资源:
```csharp
featureClass.Dispose();
GC.Collect();
```
注意:删除操作是不可逆的,所以在执行前务必确认操作无误,并确保不会影响到其他依赖此要素类的应用。
相关问题
C#arcengine编辑要素节点
要在 ArcEngine 中编辑要素节点,你需要使用 `IEditSketch` 接口来获取编辑器的草图。然后,你可以使用 `IEditSketch.Geometry` 属性获取当前正在编辑的要素的几何图形。接下来,你可以使用 `IGeometryCollection` 接口来访问要素的节点,使用 `IPointCollection` 接口来访问节点的坐标,并更新它们。最后,你需要调用 `IEditSketch.RefreshSketch()` 方法来更新编辑器中的草图。
以下是一个简单的示例代码:
```csharp
IEditSketch editSketch = (IEditSketch)editor;
if (editSketch.Geometry != null)
{
IGeometryCollection geometryCollection = (IGeometryCollection)editSketch.Geometry;
for (int i = 0; i < geometryCollection.GeometryCount; i++)
{
IPointCollection pointCollection = (IPointCollection)geometryCollection.get_Geometry(i);
for (int j = 0; j < pointCollection.PointCount; j++)
{
// 更新节点坐标
IPoint point = pointCollection.get_Point(j);
point.X += 10;
point.Y += 10;
}
}
// 刷新草图
editSketch.RefreshSketch();
}
```
C#arcengine新建要素数据集并在要素集下创建新图层
您可以使用ArcObjects中的IFeatureDataset和IFeatureClassDescription接口来创建新的要素数据集和要素类。下面是一个基本的代码示例:
```
// 获取工作空间
IWorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactory();
IWorkspace workspace = workspaceFactory.OpenFromFile("C:\data.gdb", 0);
// 获取要素集描述
UID featureDatasetUID = new UIDClass();
featureDatasetUID.Value = "esriGeoDatabase.FeatureDataset";
IFeatureDatasetDescription featureDatasetDescription = new FeatureDatasetDescriptionClass();
IFeatureClassDescription featureClassDescription = new FeatureClassDescriptionClass();
IObjectClassDescription objectClassDescription = (IObjectClassDescription)featureClassDescription;
// 创建要素集
IFeatureDataset featureDataset = ((IFeatureWorkspace)workspace).CreateFeatureDataset("myFeatureDataset", featureDatasetDescription);
// 创建要素类
UID featureClassUID = new UIDClass();
featureClassUID.Value = "esriGeoDatabase.FeatureClass";
IObjectClassDescription objectClassDescription = (IObjectClassDescription)featureClassDescription;
IFields fields = objectClassDescription.RequiredFields;
fields.AddField(CreateField("ID", esriFieldType.esriFieldTypeOID));
fields.AddField(CreateField("Name", esriFieldType.esriFieldTypeString));
IFeatureClass featureClass = featureDataset.CreateFeatureClass("myFeatureClass", fields, featureClassDescription.InstanceCLSID, featureClassDescription.ClassExtensionCLSID, esriFeatureType.esriFTSimple, "Shape", "");
// 创建图层
IMap map = new MapClass();
IFeatureLayer featureLayer = new FeatureLayerClass();
featureLayer.FeatureClass = featureClass;
featureLayer.Name = "myFeatureLayer";
map.AddLayer(featureLayer);
```
其中CreateField方法用于创建字段,示例代码如下:
```
private IField CreateField(string name, esriFieldType fieldType)
{
IField field = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = name;
fieldEdit.Type_2 = fieldType;
return field;
}
```
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