ArcGIS enginee 打开一个要素类文件，生成要素类范围外的均匀分布的随机点

以下是使用ArcObjects在指定的要素类范围外生成均匀分布的随机点的示例代码：

// Open the feature class
IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactory();
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspaceFactory.OpenFromFile(@"C:\data", 0);
IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("myFeatureClass");

// Get the extent of the feature class
IEnvelope envelope = featureClass.Extent;

// Set the number of random points to generate
int numPoints = 100;

// Generate random points outside the extent of the feature class
IRandomGenerator randomGenerator = new RandomGeneratorClass();
IPoint point = new PointClass();
IPointCollection pointCollection = new MultipointClass();
int i = 0;
while (i < numPoints)
{
    double x = envelope.XMin + (envelope.XMax - envelope.XMin) * randomGenerator.NextDouble();
    double y = envelope.YMin + (envelope.YMax - envelope.YMin) * randomGenerator.NextDouble();
    point.PutCoords(x, y);
    if (!featureClass.ShapeType.Equals(esriGeometryType.esriGeometryPoint) || !((IGeometry)point).Within(featureClass.Shape))
    {
        pointCollection.AddPoint(point, null, null);
        i++;
    }
}

// Save the points to a shapefile
IShapefileWorkspaceFactory shapefileWorkspaceFactory = new ShapefileWorkspaceFactory();
IWorkspace workspace = shapefileWorkspaceFactory.OpenFromFile(@"C:\data", 0);
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;
IFields fields = new FieldsClass();
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
IField field = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "ID";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
fieldsEdit.AddField(field);
ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
ISpatialReference spatialReference = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
IGeometryDef geometryDef = new GeometryDefClass();
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryMultipoint;
geometryDefEdit.SpatialReference_2 = spatialReference;
field = new FieldClass();
fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "Shape";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
fieldEdit.GeometryDef_2 = geometryDef;
fieldsEdit.AddField(field);
IFeatureClass featureClass = featureWorkspace.CreateFeatureClass("myRandomPoints", fields, null, null, esriFeatureType.esriFTSimple, "Shape", "");
IFeature feature = featureClass.CreateFeature();
feature.Shape = (IGeometry)pointCollection;
feature.Store();

此代码将在指定要素类范围外生成100个随机点，并将它们保存到名为“myRandomPoints”的新要素类中。请注意，您需要将“C：\ data”更改为实际路径。如果输入的要素类是点要素类，则需要删除while循环中的第5行。