首先需要引入NuGet包

ProjNET、NetTopologySuite、NetTopologySuite.Features、NetTopologySuite.GeoJson、

NetTopologySuite.Shapefile

之后直接上代码

shapePath为文件的路径，stringBuilder为返回值

using NetTopologySuite.Features;
using NetTopologySuite.Geometries;
using NetTopologySuite.IO;
using NetTopologySuite.IO.Converters;
using Newtonsoft.Json;
using ProjNet.CoordinateSystems;
using ProjNet.CoordinateSystems.Transformations;
using System;
using System.IO;
using System.Text;namespace Bd.Util.Web
{public  static class ShapeFileHelper{public static void ShpToGeoJson(string shapePath, out StringBuilder stringBuilder){ShpToFeatureCollection1(shapePath, out var collection);var target = new FeatureCollectionConverter();stringBuilder = new StringBuilder();var writer = new JsonTextWriter(new StringWriter(stringBuilder));var serializer = GeoJsonSerializer.Create(new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore },GeometryFactory.Default);target.WriteJson(writer, collection, serializer);writer.Flush();writer.Close();}private static void ShpToFeatureCollection1(string filename, out FeatureCollection collection){collection = null;try{var featureCollection = new FeatureCollection();if (!File.Exists(filename + ".dbf")){}if (!File.Exists(filename + ".prj")){}var mathForm = GetTransformFilter(filename);var dataReader = new ShapefileDataReader(filename, new GeometryFactory(new PrecisionModel()), Encoding.GetEncoding("GB2312"));while (dataReader.Read()){var transGeometry = Transform(dataReader.Geometry, mathForm);var feature = new Feature { Geometry = transGeometry };var length = dataReader.DbaseHeader.NumFields;var keys = new string[length];for (int i = 0; i < length; i++)keys[i] = dataReader.DbaseHeader.Fields[i].Name;feature.Attributes = new AttributesTable();for (var i = 0; i < length; i++){var val = dataReader.GetValue(i + 1);feature.Attributes.Add(keys[i], val);}featureCollection.Add(feature);}dataReader.Close();dataReader.Dispose();if (featureCollection.Count == 0){}collection = featureCollection;}catch (Exception ex){}}public static void Feature2GeoJson(Feature feature, out string geoJson){var geoJsonWriter = new GeoJsonWriter();geoJson = geoJsonWriter.Write(feature);}public static void Feature2Wkt(Feature feature, out string wkt){var writer = new WKTWriter();wkt = writer.Write(feature.Geometry);}public static Geometry Transform(Geometry geometry, MathTransform mathTransform){geometry = geometry.Copy();geometry.Apply(new TransFilter(mathTransform));return geometry;}/// <summary>/// geoJson 转 geometry/// </summary>/// <param name="geoJsonText"></param>/// <param name="geometry"></param>/// <param name="wkt"></param>public static void GeoJson2Geometry(string geoJsonText, out Geometry geometry, out string wkt){var reader = new GeoJsonReader();var writer = new WKTWriter();var feature = reader.Read<Feature>(geoJsonText);geometry = feature.Geometry;wkt = writer.Write(geometry);}public static MathTransform GetTransformFilter(string path){var ctFact = new CoordinateTransformationFactory();var csFact = new CoordinateSystemFactory();var wkt = File.ReadAllText(path);if (wkt.Contains("Gauss_Kruger")){wkt = wkt.Replace("Gauss_Kruger", "Transverse_Mercator");}var csForm = csFact.CreateFromWkt(wkt);var anotherSystem = GeographicCoordinateSystem.WGS84;var transformer = ctFact.CreateFromCoordinateSystems(csForm, anotherSystem);return transformer.MathTransform;}}
}

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使用后端解析地图.shp.prj文件得到GeoJson数据

首先需要引入NuGet包

之后直接上代码

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