一、数据库字段

字段类型选择(Type)

设置对象类型为：geometry

二、前端传递的Json格式转换

前端传递围栏的各个坐标点数据如下：

{
    "AreaRange": [
        {
            "lat": 30.123456,
            "lng": 120.123456
        },
        {
            "lat": 30.123456,
            "lng": 120.654321
        },
        {
            "lat": 30.654321,
            "lng": 120.654321
        },
        {
            "lat": 30.654321,
            "lng": 120.123456
        }
    ]
}

后端使用Geometry类型，ORM本项目使用了SqlSugar

/// <summary>
/// 区域围栏
/// </summary>
[SugarColumn(ColumnName= "arearange")]
public Geometry? AreaRange { get; set; }

public class MapProperty
{
    /// <summary>
    /// Latitude的简写，表示纬度
    /// </summary>
    public double lat { get; set; }
    /// <summary>
    /// Longtitude的简写，表示经度
    /// </summary>
    public double lng { get; set; }
}

后端Json转Geometry ( Polygon)多边形或者线

public static Polygon ConvertToPolygon(List<MapProperty> data)
{
    if (data == null || data.Count < 3)
    {
        throw new ArgumentException("至少需要三个点才能创建多边形");
    }
    // 创建几何工厂
    GeometryFactory factory = new GeometryFactory(new PrecisionModel(), 4326);
    // 将 List<MapProperty> 转换为 List<Coordinate>
    List<Coordinate> coordinates = data.Select(mp => new Coordinate(mp.lng, mp.lat)).ToList();
    // 添加第一个点以闭合多边形
    coordinates.Add(coordinates[0]);
    // 创建线性环
    LinearRing linearRing = factory.CreateLinearRing(coordinates.ToArray());
    // 创建多边形
    Polygon polygon = factory.CreatePolygon(linearRing);
    return polygon;
}
public static LineString ConvertToLineString(List<MapProperty> data)
    {
        if (data == null || data.Count < 2)
        {
            throw new ArgumentException("至少需要两个点才能创建多段线");
        }

        // 创建几何工厂
        GeometryFactory factory = new GeometryFactory();

        // 将 List<MapProperty> 转换为 List<Coordinate>
        List<Coordinate> coordinates = data.Select(mp => new Coordinate(mp.lng, mp.lat)).ToList();

        // 创建多段线
        LineString lineString = factory.CreateLineString(coordinates.ToArray());

        return lineString;
    }

保存入库

var area = GeoJsonHelper.ConvertToPolygon(request.AreaRange);
CommunityExtEntity ext = new CommunityExtEntity()
{
    AreaRange = area,
};
await _app.Insertable(ext).ExecuteCommandAsync();