我正在使用.NET Core REST服务，该服务将具有一个控制器，该控制器会将几何数据发送回GeoJson，以便可以在Leaflet地图上显示它。
我无法将类转换为JSON。
我已经尝试过：
StringBuilder sb = new StringBuilder();
JsonTextWriter writer = new JsonTextWriter(new StringWriter(sb));
var jsonSerializer = GeoJsonSerializer.Create(new JsonSerializerSettings()
{NullValueHandling = NullValueHandling.Ignore});
jsonSerializer.Serialize(writer, _context.Locations);
writer.Flush();
return Ok(sb.ToString());
但是然后我得到这个错误
Self referencing loop detected for property 'CoordinateValue' with type 'GeoAPI.Geometries.Coordinate'
我整天都在寻找示例和阅读文档，但无法正常工作。
我需要序列化的类：
public class SobekLocation
{
public int Id { get; set; }
public string LocationId { get; set; }
public bool Use { get; set; }
public Point Location { get; set; }
}
任何建议都值得赞赏。
修改：
我正在制作自己的功能集，并尝试对其进行序列化。它正在做某事，但是它不是有效的GeoJSON。
public FeatureCollection GetLocationsAsFeatureCollection()
{
var featureCollection = new FeatureCollection();
foreach (var location in GetLocations().Take(5))
{
var attr = new AttributesTable
{
{"Id", location.Id},
{"Use", location.Use},
{"LocationId", location.LocationId}
};
var feature = new Feature(location.Location, attr);
featureCollection.Add(feature);
}
return featureCollection;
}
和反序列化部分：
var fc = _service.GetLocationsAsFeatureCollection();
var sb = new StringBuilder();
var jsonSerializer = JsonSerializer.Create(new JsonSerializerSettings
{
// To prevent the Self referencing loop error:
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
});
using (var sw = new StringWriter(sb))
{
jsonSerializer.Serialize(sw, fc);
}
return Ok(sb.ToString());
序列化数据：
{
"Features":[
{
"Geometry":{
"CoordinateSequence":{
"Dimension":3,
"Ordinates":7,
"Count":1
},
"Coordinates":[
{
"X":191390.015,
"Y":523064.716597462,
"Z":"NaN"
}
],
"NumPoints":1,
"IsEmpty":false,
"Dimension":0,
"BoundaryDimension":-1,
"X":191390.015,
"Y":523064.716597462,
"Coordinate":{
"X":191390.015,
"Y":523064.716597462,
"Z":"NaN"
},
"GeometryType":"Point",
"OgcGeometryType":1,
"Boundary":[
],
"Z":"NaN",
"M":"NaN",
"Factory":{
"PrecisionModel":{
"IsFloating":true,
"MaximumSignificantDigits":16,
"Scale":0,
"PrecisionModelType":0,
"OffsetX":0,
"OffsetY":0
},
"CoordinateSequenceFactory":{
"Ordinates":7
},
"SRID":28992
},
"UserData":null,
"SRID":28992,
"PrecisionModel":{
"IsFloating":true,
"MaximumSignificantDigits":16,
"Scale":0,
"PrecisionModelType":0,
"OffsetX":0,
"OffsetY":0
},
"NumGeometries":1,
"IsSimple":true,
"IsValid":true,
"Area":0,
"Length":0,
"EnvelopeInternal":{
"IsNull":false,
"Width":0,
"Height":0,
"MinX":191390.015,
"MaxX":191390.015,
"MinY":523064.716597462,
"MaxY":523064.716597462,
"Area":0,
"MinExtent":0,
"MaxExtent":0,
"Centre":{
"X":191390.015,
"Y":523064.716597462,
"Z":"NaN"
}
},
"IsRectangle":false
},
"Attributes":[
{
"Key":"Id",
"Value":1
},
{
"Key":"Use",
"Value":false
},
{
"Key":"LocationId",
"Value":"KNP_1"
}
],
"BoundingBox":null
}
],
"Type":"FeatureCollection",
"CRS":null,
"Count":5,
"BoundingBox":null
}
如您所见，所有属性均以大写字母开头，但它们应为小写字母。在手动更改属性后，geojsonlint.com报告：GeoJSON features must have a type=feature member
Edit2 ：
我已经取得了一些进展。我现在正在使用GeoJSON.Net程序包，现在可以为http://geojsonlint.com/创建有效的GeoJSON标准。但是我的Leaflet地图仍在抱怨无效的GeoJSON，因此地图仍未显示任何内容；）
这是我的新转换器：
public GeoJSON.Net.Feature.FeatureCollection GetLocationsAsGeoJsonFeatureCollection()
{
var featureCollection = new GeoJSON.Net.Feature.FeatureCollection();
foreach (var location in GetLocations())
{
var attr = new Dictionary<string, object>()
{
{"Id", location.Id},
{"Use", location.Use},
{"LocationId", location.LocationId}
};
var position = new Position(location.Location.Coordinate.X, location.Location.Coordinate.Y);
var geom = new GeoJSON.Net.Geometry.Point(position);
var feature = new GeoJSON.Net.Feature.Feature(geom, attr, location.Id.ToString());
featureCollection.Features.Add(feature);
}
return featureCollection;
}
它产生的GeoJSON：
{
"type":"FeatureCollection",
"features":[
{
"type":"Feature",
"id":"1",
"geometry":{
"type":"Point",
"coordinates":[
523064.716597462,
191390.015
]
},
"properties":{
"id":1,
"use":false,
"locationId":"KNP_1"
}
},
{
"type":"Feature",
"id":"2",
"geometry":{
"type":"Point",
"coordinates":[
519349.860113963,
170162.249352578
]
},
"properties":{
"id":2,
"use":false,
"locationId":"CP_6"
}
},
{
"type":"Feature",
"id":"3",
"geometry":{
"type":"Point",
"coordinates":[
519952.507022603,
170402.383673312
]
},
"properties":{
"id":3,
"use":false,
"locationId":"CP_UR_5_1"
}
},
{
"type":"Feature",
"id":"4",
"geometry":{
"type":"Point",
"coordinates":[
519948.062527202,
170582.612655391
]
},
"properties":{
"id":4,
"use":false,
"locationId":"CP_UR_6_1"
}
},
{
"type":"Feature",
"id":"5",
"geometry":{
"type":"Point",
"coordinates":[
519902.432252114,
170602.894875503
]
},
"properties":{
"id":5,
"use":false,
"locationId":"CP_UR_6_2"
}
}
]
}
这是我的Leaflet代码：
L.geoJson('http://localhost:5000/api/data/',
{
attribution: 'Mine'
}
).addTo(map);
我仍在寻找有关如何在传单地图上轻松绘制我的PostGIS数据的建议。