arcgis二次开发加载乡镇中心的C#代码

以下是使用 C# 语言加载乡镇中心的 ArcGIS 二次开发代码：

using ESRI.ArcGIS.ArcMapUI;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;

//获取当前地图对象
IMxDocument mxDoc = ArcMap.Application.Document as IMxDocument;
IMap map = mxDoc.FocusMap;

//加载乡镇中心数据
IFeatureLayer featureLayer = new FeatureLayerClass();
featureLayer.FeatureClass = OpenFeatureClass("C:/path/to/town_center.shp");
featureLayer.Name = "Town Center";
ISimpleFillSymbol fillSymbol = new SimpleFillSymbolClass();
fillSymbol.Color = GetRGBColor(255, 0, 0);
IFillShapeElement fillShapeElement = featureLayer as IFillShapeElement;
fillShapeElement.Symbol = fillSymbol;
map.AddLayer(featureLayer);

//定义打开要素类的方法
public IFeatureClass OpenFeatureClass(string path)
{
    IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactoryClass();
    IWorkspace workspace = workspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(path), 0);
    IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;
    return featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileName(path));
}

//定义获取 RGB 颜色的方法
public IRgbColor GetRGBColor(int red, int green, int blue)
{
    IRgbColor rgbColor = new RgbColorClass();
    rgbColor.Red = red;
    rgbColor.Green = green;
    rgbColor.Blue = blue;
    return rgbColor;
}

以上代码首先获取当前地图对象，然后使用 `OpenFeatureClass` 方法打开乡镇中心的要素类，接着新建一个要素图层并将其添加到地图中，最后给要素图层添加红色的填充符号表示乡镇中心的位置。